Lectures 

How we learned to look at mountains through a microscope

Speaker: Matteo Seita, University of Cambridge 

Dr. Seita is the Granta Design Assistant Professor in the Department of Engineering at the University of Cambridge, where he leads the Additive Microstructure Engineering Laboratory (AddME Lab). The goal of the AddME Lab is to understand and control the microstructure complexity imparted by the additive process to design metallic materials with improved performance and novel functionalities. Before joining the University of Cambridge, Dr. Seita was a Nanyang Assistant Professor at NTU Singapore. During his tenure at NTU, he was awarded the prestigious NRF Fellowship—a S$3M individual grant for early-career scientists—to develop novel additive manufacturing strategies for microstructure control of metal alloys. In recognition of this work, in 2023 Dr. Seita received the TMS Young Innovator in the Materials Science of Additive Manufacturing Award from the Minerals, Metals & Materials Society. He earned his Ph.D. in Materials Science from ETH Zurich in 2012 and then spent three years as a Postdoctoral Associate in the Department of Materials Science and Engineering at MIT. Dr. Seita is the author of over 50 publications and the co-founder and technical lead of the venture XtaLight, which provides simpler, faster, and more affordable microstructure analysis for quality control of metal parts.

Past metallurgist: Henry Clifton Sorby

In this lecture, I will present the life and accomplishments of Henry Clifton Sorby, an amateur geologist and metallurgist who lived in Sheffield between 1826 and 1908. Sorby is regarded as the father of microscopical petrography and metallography, as he was the first to analyse the microstructural constituents of rocks and steel using innovative microscopy techniques. Ignoring early criticisms raised by his colleagues—who laughed at the geologist who would “look at mountains through a microscope”—Sorby continued to investigate the “hidden structure” of crystalline solids and eventually uncovered those fundamental linkages between processing, structure, and properties of steel which are so familiar to modern metallurgists. Fast forward ~160 years, I will next discuss novel optical metallography techniques devised by my research group, which—despite early scepticisms—can now be used to map crystallographic quantities in metal alloys under ambient environment and in a more time- and cost-effective manner compared to traditional diffraction-based methods.

Let There Be Light! Learning from Tungsten’s Bright Past to Enable a Fusion Energy Future

Speaker: Jason R. Trelewicz, Stony Brook University 

Dr. Jason Trelewicz is an Associate Professor in the Department of Materials Science and Chemical Engineering at Stony Brook University with a joint appointment in the Institute for Advanced Computational Science.  His research explores the science of interface engineered materials for extreme environments using advanced characterization tools coupled with multi-scale modeling and simulation. Professor Trelewicz received his Ph.D. in Materials Science and Engineering from the Massachusetts Institute of Technology in 2008.  Prior to joining Stony Brook University, he spent four years as Research Director at MesoScribe Technologies, Inc.  Professor Trelewicz is a recipient of the DOE Early Career Award (2017) and NSF Faculty Early Career Award (2016).  His work on ceramic composite moderators was selected by the Journal of Nuclear Materials for the 2022 Best Paper Award, and he also co-authored a manuscript selected for the 2022 Journal of Asian Ceramic Societies Best Paper Award.  Professor Trelewicz was recognized by Long Island Business News Power 25 in Education as a Top Innovator in Energy Research and Stony Brook University as a 40 Under 40 Honoree.  He received the Fusen and Yijen Chen Prize for Innovative Research in 2018 and Young Leader Professional Development Award from the Minerals, Metals, and Materials Society (TMS) in 2015.  Professor Trelewicz serves as Chair of the TMS Nuclear Materials Committee, Review Editor for Frontiers in Nuclear Engineering, Board of Review Member and Key Reader for Metallurgical and Materials Transactions A, and Chair of the Tungsten Alloys Working Group for the International Energy Agency Fusion Materials Technology Collaboration Program.

Past metallurgist: William D. Coolidge

William Coolidge’s seminal paper on Ductile Tungsten presented at the 249th Meeting of the American Institute of Electrical Engineers in 1910 began with: “When work was first started on the problem of producing a ductile form of tungsten, the metal looked very uncompromising. It was so hard that it could not be filed without detriment to the file, and was, at ordinary temperatures, very brittle.” Such a dispiriting view was not surprising, as up to this point, carbon filaments were the technology of choice but suffered from being extremely brittle with short lifetimes. Coolidge, learning from prior experiments on tungsten-based ‘amalgams’, solved the ductility problem in tungsten by tediously controlling the mechanical working process while reducing manufacturing impurities, concluding in the same publication that “the product which we now have is a perfectly pliable ductile wire, which has the strength of steel”. Over a century after Coolidge established the foundation for the incandescent lightbulb revolution, we appear to be at a similar crossroads with tungsten – albeit for constructing high heat flux components for future fusion reactors. This talk describes how Coolidge’s work has inspired our own pursuits in designing stable nano-engineered tungsten alloys for fusion reactor components using grain boundary solute segregation synergistically with nano-dispersed carbide precipitation. With alloy stability demonstrated above common recrystallization temperatures for tungsten and under high-dose irradiation, our findings provide a new foundation for nano-engineered tungsten alloy fusion reactor components rooted in the microstructure control initially pioneered by Coolidge.

Seeing is believing!

Speaker:  Maria Teresa Perez-Prado, IMDEA Materials Institute

Dr. Teresa PÉREZ-PRADO, Senior Scientist, heads since 2008 the Sustainable Metallurgy group at IMDEA Materials Institute. Teresa was Division Leader between 2014 and 2017 and Deputy Director between 2017 and 2021. From 2018 to 2022 she coordinated the programme on Structural Materials at the Spanish National Science Foundation. Dr. Pérez-Prado got a PhD in Physics at the Complutense University in Madrid in 1998 and an MBA at INSEAD, France, in 2008. After a 2 year postdoctoral stay at the University of California in San Diego, USA, she joined the National Center for Metals Research (Madrid, Spain) in 2001, where she worked as a tenure-track fellow until she was granted a Tenured Scientist position in 2004. Dr. Pérez-Prado has coauthored 145 papers (h 49, ≈9100 citations (Google Scholar)), 1 book (Elsevier, 2004) and 3 patents. Teresa belongs to the Scientific Council of the Nomaten Center of Excellence (Poland), the IRT Jules Verne (France), the Henry Royce Institute (UK), and the European Space Agency (ESA).

Past Metallurgist:  Max von Laue and Seishi Kikuchi

This lecture honors physicists Max von Laue (1879-1960) and Seishi Kikuchi (1902-1974) who despite living in times of major political upheaval and having limited resources made key discoveries related to X-ray and electron diffraction that enabled great progress in metals characterization. Max von Laue was awarded a Nobel Prize in 1914 for his discovery the diffraction of X-rays on crystals. In 1928 Seishi Kikuchi first observed and explained the lines that appear in diffraction patterns of diffusely scattered electrons.

“Seeing is believing” alludes to the pivotal role that the characterization techniques developed based on the findings of these great scientists have had in advancing metallurgical research. Focus will be placed on electron backscattered diffraction (EBSD), which uses Kikuchi patterns as the raw data to determine crystal orientation, and which has become a mainstream characterization method following its first commercialization at the end of the last century.

Examples of application of EBSD to understand Hall-Petch effects and the 3D nature of twinning in magnesium alloys will be given.

Under Pressure – The Lasting Impact of Percy Bridgman on Processing in Extreme Conditions

Speaker:  Suveen Mathaudhu, Colorado School of Mines

Suveen Mathaudhu (he/him) is a professor in the Metallurgical and Materials Engineering Department at the Colorado School of Mines. Mathaudhu’s career trajectory has spanned diverse roles, with his primary areas of interest centering around powder and deformation processing of metallic alloys and composite materials with foci on nanocrystalline materials, lightweight alloys and refractory metals, materials science education and outreach, and advocacy for diversity and inclusion in STEM. Prior to Colorado School of Mines, Mathaudhu was a professor and chair of the MSE Program at the University of California, Riverside (2014–2021); a program manager at the U.S. Army Research Office and a postdoc and then materials engineer at the U.S. Army Research Laboratory. Some recognitions Mathaudhu has earned include the 2015 American Association of Engineering Societies Norm Augustine Award for Outstanding Achievement in Engineering Communication; 2015 ASM Fellow; 2016 National Science Foundation CAREER Grant; 2019 Presidential Early Career Award for Scientists and Engineers; and 2021 TMS Brimacombe Medal. Mathaudhu received his B.S.E. from Walla Walla University, and his M.S. and Ph.D. degrees from Texas A&M University, all in mechanical engineering.

Past Metallurgist:  Percy Bridgman 

Abstract:  Percy Bridgman (1882 – 1961) received the 1946 Nobel Prize in Physics for his studies of matter under high pressure.   His studies of the effects of high pressure and thermodynamic behavior were extensively investigated at pressures of up to 10 GPa through his “fertile mechanical imagination”, which improved on instruments capping out at 0.3GPa at the time.  These instruments allowed the study of compressibility, electric and thermal conductivity, tensile strength and viscosity of more than 100 different materials, including the study of metals such as plutonium and uranium for the Manhattan Project.  It the decades following Bridgman’s seminal instruments and discoveries, the understanding of the behavior of materials has exploded based on rotational diamond anvil and high pressure torsion studies.  In this lecture, we will journey through Bridgman’s life and discoveries, and lead into how they have influenced our modern understanding of both metallic and geological materials under extreme pressures, shears and temperatures. 

From Liberty Ships to Hydrogen Bubbles: Understanding Environmental Degradation of Metals through Microstructures

Speaker: Mengying Liu, Washington and Lee University  

Mengying Liu is an Assistant Professor of Engineering at Washington and Lee University. Her primary research interests focus on the environmental degradation of metallic materials. This includes specific projects on hydrogen embrittlement of Ni-based alloys and localized corrosion of pure Ni. Liu employs techniques like scanning electron microscopy characterization with digital image correlation to explore the structure-properties relationship of these materials. She holds a Ph.D. in Materials Science and Engineering from Texas A&M University and an undergraduate degree from Tianjin University in China. Liu is an awardee from the American Association of University Women, known for her passion for mentoring female students and fostering their growth, both academically and personally.

Past metallurgist: Constance Tipper 

This lecture delves into the pioneering work of Constance Tipper and its profound influence on modern metallurgical research, particularly highlighting her role as a trailblazer for women in engineering. Tipper's research on the ductile-to-brittle transition in metals used in Liberty Ships, marked a significant advancement in metallurgy. As the first to employ scanning electron microscopy (SEM) to study metal fractures at a microstructural level, she established a vital precedent in the field.

Building upon this legacy, my research focuses on hydrogen embrittlement in nickel alloys, utilizing advanced in-situ SEM tensile testing techniques. This endeavor resonates with Tipper's dedication to uncovering the slip band formation and twin-like structures in metals. Furthermore, it expands our knowledge by quantitatively analyzing grain boundary slips using digital image correlation (DIC). This approach enhances our understanding of the role of hydrogen and slip in embrittled crack initiation, thus continuing the unbroken thread of inquiry in metallurgical research.

Tipper's achievements not only advanced materials engineering but also laid the groundwork for future generations of women in this domain. Her inspiring journey has been a catalyst in my own path, motivating me to educate and empower the younger generation to surmount gender barriers in science and engineering.

Designing alloys from their liquid structure

Speaker: Marie Charpagne, University of Illinois Urbana-Champaign

Marie A. Charpagne is an assistant professor in the Materials Science and Engineering Department at the University of Illinois at Urbana-Champaign. Before joining UIUC in 2021, she was a postdoctoral researcher at the University of California in Santa Barbara where she developed new techniques in correlative and 3D electron microscopy. Her research leverages core concepts in physical metallurgy and micro-mechanics to design new alloys for additive manufacturing. She received her NSF CAREER award as well as the ACS New investigator award in 2023.

Past metallurgist: Frederick Charles Frank

This lecture will be dedicated to Frederick Charles Frank (1911-1998) and his pioneering contributions to understanding crystal growth, dislocations, and disclinations.

In 1952, Franck published a pioneering article on the structure of metallic liquids (Proc R Soc Lond Ser-Math Phys Sci 215:43–46, 1952) -postulating that icosahedral short-range ordering in molten metals may explain the large undercoolings previously observed by Turnbull and Fischer (J Chem Phys 17:71–73, 1949). This hypothesis has been critical in understanding quasicrystal formation and metallic glass formation. More recently, short-range ordering in the liquid has been shown to lead to the formation of twinned crystals, even in materials of high stacking fault energy. In this lecture, I will present how short-range ordering in the liquid can be leveraged as a driving force to design new alloys for additive manufacturing, randomizing crystal orientations and refining grain sizes. Following this principle, the goal of my research is to mitigate some of the most pressing challenges in the field of additive manufacturing: reducing mechanical anisotropy and increasing fatigue performance.

Breaking bonds and making them: How Tony Evans changed the world and had fun along the way

Speaker: Zachary Cordero, Massachusetts Institute of Technology

Zack Cordero received his SB in physics from MIT in 2010. After working one year in the materials science division at Lawrence Berkeley National Laboratory, Zack returned to MIT to pursue a PhD in materials science and engineering, where his research focused on the powder-route synthesis of bulk nanostructured tungsten alloys. Upon graduating in 2015, Zack moved to a postdoctoral fellowship appointment in the Manufacturing Demonstration Facility of Oak Ridge National Laboratory where he developed process monitoring, quality control, and microstructure design tools for power-bed, metal additive manufacturing technologies. In 2016, Zack launched his independent career as an assistant professor in the Materials Science and NanoEngineering department at Rice University. In 2020, he moved to MIT’s Department of Aeronautics and Astronautics. Zack’s research program at MIT integrates his expertise in processing science, mechanics, and design to develop novel materials and structures for emerging aerospace applications.

Past metallurgist: Tony Evans

This lecture celebrates the life and career of Tony Evans (1942 – 2009), whose vision, technical excellence, and extraordinary leadership unlocked advances in the science and engineering of brittle structural materials for extreme environments. Tony Evans was literally and figuratively an itinerant researcher – moving from institution to institution (NIST, Rockwell International, UC Berkeley, UCSB, Princeton, Harvard) and from topic to topic (fracture mechanics, brittle matrix composites, thin films, porous solids, architectured materials, among many others) over his prolific career. Wherever he landed, Tony had an impact, forging powerful collaborations with colleagues from academia and industry, pushing into new disciplines without fear, and leading important research campaigns that yielded fundamental insights with real-world practical implications. This talk will review Tony’s many contributions to the materials used in modern aeroengines, focusing specifically on his foundational work on ceramic matrix composites and advanced ceramic coatings. I will cover how Tony helped push these technologies from lab curiosities into the current generation of gas turbines. I will also discuss how his taste in problems and approach to research can serve a roadmap for the current generation of materials engineers seeking to change the world while having a blast.

From CALculation of PHAse Diagrams to Modern Digital Metallurgy: The (R)Evolution in Alloy Design

Speaker: Kathy Christofidou, University of Sheffield 

Katerina (Kathy) Christofidou joined the department of Materials Science and Engineering at the University of Sheffield in 2019, and was appointed Chair in Digital and Sustainable Metallurgy in April 2024. She is currently the Director of Recruitment for the department and leads the Advanced Metals Processing research area for the Henry Royce Institute. She holds a PhD in Metallurgy from the University of Cambridge and an MEng in Aerospace Materials Engineering from Imperial College London. Kathy's research focuses on bridging high performance alloy design and advanced manufacturing. As part of her collaboration with Rolls-Royce PLC, she has developed new polycrystalline Ni-based superalloys for turbine disc applications, as well as exploring strategies for the design of high-temperature materials amenable to laser-based additive layer manufacturing. Her work in this area was recognised with the 2022 IOM3 Grünfeld Award and Medal highlighting her contributions and impact to industry.

Past metallurgist: Scientists developed CALPHAD

The CALPHAD methodology, and computational thermodynamics in general, has been instrumental in enabling a revolution in alloy design, understanding of microstructure development, and propelling physical metallurgy to the 21st century. The development of CALPHAD itself, however, also offers a masterclass in collaboration and community building towards a unified scientific vision and can be chronicled as one of our most notable successes in Materials Science over the past 50 years. This lecture will delve into the history of the development of the CALPHAD method and the extraordinary scientists that pioneered its use; from the first CALPHAD meeting in 1973 discussing pure elements and lattice instabilities to the present-day evolution of CALPHAD as a fundamental tool for physical metallurgy. Building on this, I will discuss my own work in alloy design for aerospace applications, always underpinned by CALPHAD, and the fundamental role that CALPHAD will play in our transition towards materials informatics approaches to alloy design.

Microstructure design via additive manufacturing: What can we learn from traditional metallurgy

Speaker:  Nima Haghdadi, Imperial College London

Dr Nima Haghdadi is a Senior Lecturer in the Department of Materials at Imperial College since February 2024. He also holds an adjunct senior lectureship position with UNSW Sydney in Australia, where he previously was a Lecturer and postdoctoral research fellow from 2019 to 2024. Prior to that, Dr. Haghdadi held positions as a Deakin University Vice-Chancellor (Alfred-Deakin) Fellow and a Victoria Fellow from 2017 to 2019, during which he conducted the overseas part of his research at the Max-Planck-Institut für Eisenforschung GmbH in Germany. He earned his PhD from the Institute for Frontier Materials at Deakin University, Australia in 2017.

Dr. Haghdadi is the recipient of numerous awards including the prestigious FEI Cowley-Moodie award for an outstanding contribution to physical sciences using electron microscopy, as well as the Acta Materialia student award. His research, published in leading physical metallurgy journals, has attracted over 3900 citations with a current H-index of 34. He has presented numerous invited talks at international conferences, including Thermec, Rex&GG, CAMS, PRICM, and APICAM.

With a broad and deep expertise spanning fundamental discovery and applied industry research, Dr. Haghdadi's team aims to establish a conceptual bridge between microstructure-property relationships across thermo-mechanical processing and additive manufacturing pathways in various metallic materials systems with applications in aerospace, automotive, defense, mining, energy, and biomedical sectors. His group's focus lies particularly on interface and grain boundary engineering and its impact on materials' performance and durability. Dr. Haghdadi has supervised 6 PhD students and 5 honours/MSc students. He serves as an editor for the Springer’s Journal of Materials Science and is an active member of other professional organisations such as Materials Australia.

Past Metallurgist:  Max Hatherly

In this presentation, I will explore the life, achievements, and scientific contributions of Professor Max Hatherly (1922-2011), an innovative Australian physical metallurgist. Prof. Hatherly, a passionate environmentalist with a love for nature, is most recognized in contemporary times for his authorship of the book "Recrystallisation and Related Annealing Phenomena." However, he also did significantly influence thinking in the areas of deformation, recrystallization and texture. One of his biggest contributions was to show the extreme degree of heterogeneity that takes place in deformed metals. In 1968 he reported that individual grains split up into deformation bands having very diverse textures. He was a pioneer in rationalizing microbands and shear bands in deformed metals. Interestingly, there still remains a dispute as to whether the microbands lie on crystallographic planes or not. Many assume they are crystallographic including researchers at Risö, while some very elegant statistical work at Manchester showed that microbands are not specifically crystallographic. In the latter part of this lecture, I will delve into my own research on the additive manufacturing of metals. I will elucidate how leveraging some of the established concepts in the deformation and recrystallization of metals including those discovered by Max Hatherly can help us attain advanced property profiles in additively manufactured steels.

Beyond the Atmosphere: Exploring Mechanics in Modern Metallurgy

Speaker: David Collins, University of Cambridge 

David Collins is the Mike Ashby Associate Professor in Materials Science in the Department of Materials Science and Metallurgy at the University of Cambrigde. His research interests focus on manufacturing and processing methods related to advanced metal forming technologies with an interest in aerospace and automotive applications. David’s expertise is in physical metallurgy - incorporating the science that underpins metallic material behaviour. This includes deformation mechanics & microstructure/phase evolution, with many of his studies using state-of-the art in-situ synchrotron X-ray and neutron diffraction experimental methods. Along with electron microscopy characterisation and modelling methods, David’s studies target understanding at the crystal level to interpret, manipulate and exploit the material behaviour to improve performance at the component level.

Past Metallurgist: Sir Alan Cottrell, FRS (1919 –2012)

Alan Cottrell was a pivotal figure in metallurgy, whose theoretical and practical contributions fundamentally shaped the field. Cottrell’s seminal work was the discovery of interstitial atom that pin dislocations, known widely as the ‘Cottrell atmosphere’, to explain the mechanical performance of ferritic steels. Linking impurities to plasticity behaviour in metals extends to understating hardness, brittleness and strain ageing in steels.  More broadly, his work on dislocation theory enhanced our understanding of alloy deformation and mechanical properties. Cottrell’s contributions to fracture mechanics have helped define modern approaches to assessing fracture toughness and crack propagation in metals, including low temperature brittle fracture in steels. Through his research, Cottrell influenced materials design and the development of new alloys, focusing on improved performance under challenging conditions. His legacy continues with his discoveries remaining relevant to modern material engineering practices. This talk will discuss the advances made from Cottrell’s discoveries, outline areas of remaining contention and opportunities for future metallurgical research.

Anchors Away! CALPHAD-Designed Joints for Dissimilar Alloys

Speaker: Ian McCue, Northwestern University 

McCue is a tenure-track Assistant Professor, and the Morris E. Fine Junior Professor in Materials and Manufacturing, at Northwestern University in the Department of Materials Science and Engineering. His research group focuses on designing superior materials for extreme applications – e.g., aerodynamic, radiation, and corrosion – and understanding how their microstructures evolve in these environments. He received his PhD degree in Materials Science and Engineering from Johns Hopkins University in 2015, and received a Materials Research Society Silver Graduate Student Award in 2014 for his dissertation work. He then held a postdoctoral appointment at Texas A&M University from 2016-2018, and was a Senior Scientist at the Johns Hopkins University Applied Physics Laboratory from 2018-2022. He has been an invited speaker at two Gordon Research Conferences: the 2019 Physical Metallurgy, and 2022 Structural Nanomaterials. He received a NASA Early Career Faculty Award in 2021 to develop solutions to bonding nitinol to dissimilar alloys, and a DARPA Young Faculty Award in 2023 to develop a new method to rapidly evaluate the mechanical properties of metals at high strain rates.

Past metallurgist: Thomas Eagar

Joining of dissimilar materials is a long-standing engineering challenge because brittle intermetallics readily form when elements chemically interact. This issue is particularly prevalent in aerospace, where platforms consist of many different materials that operate at temperatures where diffusion is active. Current joining strategies rely on rivets and bolts, which add unnecessary weight and volume to these structures. Here, transient liquid phase (TLP) bonding is studied as a viable solution.  TLP involves heating a joint to a temperature where interdiffusion produces a lower melting point liquid, which subsequently undergoes isothermal solidification to form a dense joint. While there have been several key contributors to this technique over the years, Thomas Eagar (DMSE MIT) pioneered much of our understanding on the kinetics of TLP. Professor Eagar was a member of the National Academy of Engineering, a former head of the Department of Materials Science and Engineering, and made many critical contributions to the fields of welding and metallurgy. In this talk we will show how Eagar’s models for TLP can be extended to dissimilar joining – something that was previously considered not possible.

Metals in Motion: Celebrating the Scientific Legacy of Prof. R.W. Armstrong

Speaker: Liliana Romero Resendiz, National Autonomous University of Mexico 

Liliana Romero-Resendiz is currently an assistant professor at the National Autonomous University of Mexico (UNAM), Mexico (since 2022), Senior Marie Curie Research Fellow at Bournemouth University, UK (since 2023), and Research Fellow at the University of Birmingham, UK (since 2023). She was a postdoctoral fellow at the City University of Hong Kong, China (2021-2022). She obtained her Ph.D. in Materials Science and Engineering under a project co-guided by UNAM, Mexico, and the Polytechnic University of Valencia, Spain (2021). She was a lecturer at the Engineering College of UNAM (2019-2020). She has been awarded the Marie Curie Fellowship from the European Union and the Juan de la Cierva Fellowship from the Spanish Ministry for Science and Innovation. Her research interest includes the processing-microstructure-properties relationship of heterostructured and nanostructured alloys, as well as developing biomaterials for antimicrobial and biomedical implant applications. She is currently a guest editor of special issues for the Crystals and Materials journals. She was chair of the Symposium on Materials Science and Engineering (Mexico, 2020) supported by the Material Research Society (MRS), member of the organizing committee of the First International Conference on Heterostructured Materials (Hong Kong, 2022), and chair of the “Heterostructured Materials: Fundamentals, Processing, Properties and Applications” international symposium supported by the MRS (Mexico, 2023).  She will be chair of the “Materials under Extreme Environments: Process-Structure-Property Relationship” international symposium of the MRS (Mexico, 2024). 

Past metallurgist: Ronald W. Armstrong

This talk will be dedicated to Prof. Ronald W. Armstrong (1934-2023), who was Professor Emeritus at the University of Maryland, United States. His vast contributions were crucial to a deep fundamental understanding of the metallurgical field, including dislocation mechanics, constitutive equations, Hall-Petch relations, Zerilli-Armstrong equations, high-rate metallic deformations, ductile-brittle transition behaviors, and X-ray imaging. In addition to his extensive scientific contributions, he motivated many generations of metallurgists with his exceptional human qualities. This talk will briefly cover Prof. Armstrong's biography, his scientific contributions, and the inspiration his work provided to my research on metallic materials.