High Temperature Structural Materials Group

Singaravelu Sabari Rajan, NTBN Koundinya, S.V.S. Narayana Murthy, B.K. Nagesha, G.D.Janaki Ram, Ravi Sankar Kottada, 2024. Understanding the role of microstructure on creep anistropy in additively manufactured IN718 . Materials Characterization, 223, 114935. 

Singaravelu Sabari Rajan, NTBN Koundinya, Akshat Godha, Surendra Kumar Makineni, S.V.S. Narayana Murthy, B.K. Nagesha, G.D.Janaki Ram, Ravi Sankar Kottada, 2024. Unravelling the dominant influence of microsegregation on creep rupture behaviour of additively manufactured inconel 718. Materials Science and Engineering: A 919, 147480. 

Ranjith Kumar Ilangovan, NTBN Koundinya, Hariharan Krishnaswamy, Gurunathan Saravana Kumar, Murugaiyan Amirthalingam, Ravi Sankar Kottada, 2024. Influence of powder surface chemistry on the defect formation in AlSi10Mg alloy processed via laser powder bed fusion additive manufacturing. Materialia, 34, 102102. 

Abhinav Kumar Karnati, NTBN Koundinya, Anuradha Nayak Majila, Ravi Sankar Kottada , 2024. Understanding the sigmoidal primary creep behaviour in a multi-component solid-solution Co-base alloy between 700 – 850 °C. Materialia, 34, 102098. 

Nandha Kumar E, Kottada, R.S. & Janaki Ram, G., 2023. A critical understanding on the microstructure and creep failure of Super304H/T92 dissimilar multilayer welds. Weld World, 68, 227–246.

Karnati, A. K., Koundinya, N. T. B. N., Majila, A. N., Fernando D, C., & Kottada, R. S., 2023. On the substructure evolution and its distinct role on dynamic strain aging in a multi-component cobalt base alloy at intermediate temperatures (300 to 700 °C). Scripta Materialia, 234, 115583.

Samantaray, B. K., Kumar, U., Kumar, E. N., Kottada, R. S., Bartarya, G., & Gollapudi, S., 2022. Compaction and Pressureless Sintering Characteristics of Silicon and a Silicon Composite Containing a Multicomponent Molybdenum Alloy Reinforcement. Silicon, 3225–3236.

Sathiyamoorthi, P., Chawake, N., Zargaran, A., & Kottada, R. S., 2023. Editorial: High entropy alloy design concept enabled emerging novel materials with enhanced mechanical properties. Frontiers in Materials, 10, 1–2.

Koundinya, N. T. B. N., Karnati, A. K., Sahadevan, A., Murty, S. V. S. N., & Kottada, R. S., 2023. Assessment of the post-dynamic recrystallization effects on the overall dynamic recrystallization kinetics in a Ni-base superalloy. Journal of Alloys and Compounds, 930, 167412.

Karnati, A.K., Koundinya, N.T.B.N., Majila, A.N. and Kottada, R.S., 2022. Unusual substructure evolution and post-dynamic recrystallization effects on flow softening mechanism in a γ′-free Co-base superalloy. Materialia, 24, p.101467. 

Meghwal, A., Anupam, A., Schulz, C., Hall, C., Murty, B.S., Kottada, R.S., Vijay, R., Munroe, P., Berndt, C.C. and Ang, A.S.M., 2022. Tribological and corrosion performance of an atmospheric plasma sprayed AlCoCr0. 5Ni high-entropy alloy coating. Wear, p.204443.

Dora, T. R. K., Goud, R., Sahadevan, A., Chand, A. H., Jha, R., De, P. S., Gollapudi, S., 2021. Investigations into sample geometry effects on the superelastic and fatigue behavior of Nitinol: Modeling and experiments. Materialia, 20, 101256. doi:10.1016/J.MTLA.2021.101256

Meghwal, A., Anupam, A., Luzin, V., Schulz, C., Hall, C., Murty, B.S., Kottada, R.S., Berndt, C.C. and Ang, A.S.M., 2020. Multiscale mechanical performance and corrosion behaviour of plasma sprayed AlCoCrFeNi high-entropy alloy coatings. Journal of Alloys and Compounds, p.157140. 

Chawake, N., Raman, L., Ramasamy, P., Ghosh, P., Spieckermann, F., Gammer, C., Murty, B.S., Kottada, R.S. and Eckert, J., 2021. Composite of medium entropy alloys synthesized using spark plasma sintering. Scripta Materialia, 191, pp.46-51. 

Koundinya, N.T.B.N. and Kottada, R.S., 2021. Synergetic influence of microconstituents on the damage accumulation and consequent effect on the flow behaviour in cast Mg–Ca–Sn alloys. Materials Science and Engineering: A, p.140167. 

Meghwal, A., Anupam, A., Luzin, V., Schulz, C., Hall, C., Murty, B.S., Kottada, R.S., Berndt, C.C. and Ang, A.S.M., 2020. Multiscale mechanical performance and corrosion behaviour of plasma sprayed AlCoCrFeNi high-entropy alloy coatings. Journal of Alloys and Compounds, p.157140. 

Raman, L., Karthick, G., Guruvidyathri, K., Fabijanic, D., Murty, S.N., Murty, B.S. and Kottada, R.S., 2020. Influence of processing route on the alloying behavior, microstructural evolution and thermal stability of CrMoNbTiW refractory high-entropy alloy. Journal of Materials Research, 35(12), pp.1556-1571. 

Koundinya, N.T.B.N. and Kottada, R.S., 2020. Distinct role of eutectic morphology on the plastic flow in cast Mg–3Ca alloy. Materials Science and Engineering: A, p.139633. 

Meghwal, A., Anupam, A., Murty, B.S., Berndt, C.C., Kottada, R.S. and Ang, A.S.M., 2020. Thermal Spray High-Entropy Alloy Coatings: A Review. J Therm Spray Tech, 29, 857–893. 

Nandha Kumar E., Ram, G.J., Devakumaran, K. and Kottada, R.S., 2020. Effect of long-term exposure at 650° C on microstructural and creep characteristics of T92/Super304H dissimilar welds. Welding in the World, 64(3), pp.467-481. 

Anupam, A., Kottada, R.S., Kashyap, S., Meghwal, A., Murty, B.S., Berndt, C.C. and Ang, A.S.M., 2020. Understanding the microstructural evolution of high entropy alloy coatings manufactured by atmospheric plasma spray processing. Applied Surface Science, 505, p.144117. 

Koundinya, N.T.B.N., Rangan, K., Murty, S.N. and Kottada, R.S., 2020. Exploring the Safe Hot Working Regime of Creep-Resistant Mg-3Ca-2Sn-1Al Alloy. Materials Performance and Characterization, 9 (2). 

Koundinya, N.T.B.N., Bharadwaj, K.S., Kumar, E.N., Murty, S.N. and Kottada, R.S., 2019. Understanding the Hot Working Behavior of a Ni-Base Superalloy XH 67 via Processing Map Approach. Materials Performance and Characterization, 9 (2). 

Chawake, N., Ghosh, P., Eckert, J. and Kottada, R.S., 2019. An investigation on diffusivity while achieving a cylindrical aluminide coating on metals using simultaneous spark plasma sintering of powders. Scripta Materialia, 170, pp.156-160. 

Koundinya, N.T.B.N. and Kottada, R.S., 2019. On the role of Al and Zn addition on eutectic morphology in Mg-3Ca-2Sn cast alloy. Scripta Materialia, 162, pp.432-436. 

Koundinya, N.T.B.N. and Kottada, R.S., 2019. Achieving exceptional creep resistance in rare-earth-free Mg-base alloys by engineering the shape, size and fraction of eutectic, particles and precipitates. Scripta Materialia, 162, pp.121-126. 

Anupam, A., Kumar, S., Chavan, N.M., Murty, B.S. and Kottada, R.S., 2019. First report on cold-sprayed AlCoCrFeNi high-entropy alloy and its isothermal oxidation. Journal of Materials Research, 34 (5), pp.796-806. 

Raman, L., Guruvidyathri, K., Kumari, G., Murty, S.N., Kottada, R.S. and Murty, B.S., 2019. Phase evolution of refractory high-entropy alloy CrMoNbTiW during mechanical alloying and spark plasma sintering. Journal of Materials Research, 34 (5), pp.756-766. 

Chawake, N., Ghosh, P., Raman, L., Srivastav, A.K., Paul, T., Harimkar, S.P., Eckert, J. and Kottada, R.S., 2019. Estimation of diffusivity from densification data obtained during spark plasma sintering. Scripta Materialia, 161, pp.36-39.

Mannava, V., SambasivaRao, A., Kamaraj, M. and Kottada, R.S., 2019. Influence of Two Different Salt Mixture Combinations of Na 2 SO 4-NaCl-NaVO 3 on Hot Corrosion Behavior of Ni-Base Superalloy Nimonic 263 at 800°C. Journal of Materials Engineering and Performance, 28(2), pp.1077-1093. 

Mannava, V., Sambasivarao, A., Paulose, N., Kamaraj, M. and Kottada, R.S., 2019. An investigation of oxidation/hot corrosion-creep interaction at 800°C in a Ni-base superalloy coated with salt mixture deposits of Na2SO4-NaCl-NaVO3. Corrosion Science, 147, pp.283-298. 

Paul, T., Chawake, N., Kottada, R.S. and Harimkar, S.P., 2018. Pressure controlled micro-viscous deformation assisted spark plasma sintering of Fe-based bulk amorphous alloy. Journal of Alloys and Compounds, 738, pp.10-15.

Chawake, N., Koundinya, N.T.B.N. and Kottada, R.S., 2018. Verification of correlation between densification during spark plasma sintering and compressive creep of ultrafine-grained in-situ Al 2 O 3-reinforced B2 aluminide matrix composites. Journal of Alloys and Compounds, 735, pp.1921-1930.

Praveen, S., Anupam, A., Tilak, R. and Kottada, R.S., 2018. Phase evolution and thermal stability of AlCoCrFe high entropy alloy with carbon as unsolicited addition from milling media. Materials Chemistry and Physics, 210, pp.57-61.

Sathiyamoorthi, P., Basu, J., Kashyap, S., Pradeep, K.G. and Kottada, R.S., 2017. Thermal stability and grain boundary strengthening in ultrafine-grained CoCrFeNi high entropy alloy composite. Materials & Design, 134, pp.426-433.

Karthik, G.M., Ram, G.J. and Kottada, R.S., 2017. Use of Friction Stir Processing for Improving Heat-Affected Zone Liquation Cracking Resistance of a Cast Magnesium Alloy AZ91D. Metallurgical and Materials Transactions B, 48(6), pp.3270-3280.

Karthik, G.M., Ram, G.J. and Kottada, R.S., 2017. Use of Friction Buttering for Overcoming HAZ Liquation Cracking. Metallurgical and Materials Transactions B, 48(5), pp.2274-2280.

Karthik, G.M., Mastanaiah, P., Ram, G.J. and Kottada, R.S., 2017. Friction Buttering: A New Technique for Dissimilar Welding. Metallurgical and Materials Transactions B, 48(3), pp.1416-1422.

Karthik, G.M., Ram, G.J. and Kottada, R.S., 2017. Friction stir selective alloying. Materials Science and Engineering: A, 684, pp.186-190.

Karthik, G.M., Panikar, S., Ram, G.J. and Kottada, R.S., 2017. Additive manufacturing of an aluminum matrix composite reinforced with nanocrystalline high-entropy alloy particles. Materials Science and Engineering: A, 679, pp.193-203.

Karthik, G.M., Ram, G.J. and Kottada, R.S., 2017. Heat-Affected Zone Liquation Cracking Resistance of Friction Stir Processed Aluminum-Copper Alloy AA 2219. Metallurgical and Materials Transactions B, 48(2), pp.1158-1173.

Krishna, S.C., Chawake, N., Kottada, R.S., Jha, A.K., Pant, B. and Venkitakrishnan, P.V., 2017. High Strength and Good Ductility in Cu-3Ag-0.5 Zr Alloy by Cryo-Rolling and Aging. Journal of Materials Engineering and Performance, 26(1), pp.350-357.

Chawake, N., Varanasi, R.S., Jaswanth, B., Pinto, L., Kashyap, S., Koundinya, N.T.B.N., Srivastav, A.K., Jain, A., Sundararaman, M. and Kottada, R.S., 2016. Evolution of morphology and texture during high energy ball milling of Ni and Ni-5 wt% Cu powders. Materials Characterization, 120, pp.90-96.

Chawake, N., Koundinya, N.T.B.N., Kashyap, S., Srivastav, A.K., Yadav, D., Mondal, R.A. and Kottada, R.S., 2016. Formation of amorphous alumina during sintering of nanocrystalline B2 aluminides. Materials Characterization, 119, pp.186-194.

Samal, S., Rahul, M.R., Kottada, R.S. and Phanikumar, G., 2016. Hot deformation behaviour and processing map of Co-Cu-Fe-Ni-Ti eutectic high entropy alloy. Materials Science and Engineering: A, 664, pp.227-235.

Mannava, V., Swaminathan, A.V., Kamaraj, M. and Kottada, R.S., 2016. An innovative spraying setup to obtain uniform salt (s) mixture deposition to investigate hot corrosion. Review of Scientific Instruments, 87(2), p.025107.

Mannava, V., Rao, A.S., Paulose, N., Kamaraj, M. and Kottada, R.S., 2016. Hot corrosion studies on Ni-base superalloy at 650° C under marine-like environment conditions using three salt mixture (Na2SO4+ NaCl+ NaVO3). Corrosion Science, 105, pp.109-119.

Praveen, S., Basu, J., Kashyap, S. and Kottada, R.S., 2016. Exceptional resistance to grain growth in nanocrystalline CoCrFeNi high entropy alloy at high homologous temperatures. Journal of Alloys and Compounds, 662, pp.361-367.

Karthik, G.M., Ram, G.J. and Kottada, R.S., 2016. Friction deposition of titanium particle reinforced aluminum matrix composites. Materials Science and Engineering: A, 653, pp.71-83.

Chawake, N., Koundinya, N.T.B.N., Srivastav, A.K. and Kottada, R.S., 2015. On correlation between densification kinetics during spark plasma sintering and compressive creep of B2 aluminides. Scripta Materialia, 107, pp.63-66.

Ang, A.S.M., Berndt, C.C., Sesso, M.L., Anupam, A., Praveen, S., Kottada, R.S. and Murty, B.S., 2015. Plasma-sprayed high entropy alloys: microstructure and properties of AlCoCrFeNi and MnCoCrFeNi. Metallurgical and Materials Transactions A, 46(2), pp.791-800.

Chawake, N., Pinto, L.D., Srivastav, A.K., Akkiraju, K., Murty, B.S. and Kottada, R.S., 2014. On Joule heating during spark plasma sintering of metal powders. Scripta Materialia, 93, pp.52-55.

Praveen, S., Murty, B.S. and Kottada, R.S., 2014. Effect of molybdenum and niobium on the phase formation and hardness of nanocrystalline CoCrFeNi high entropy alloys. Journal of nanoscience and nanotechnology, 14(10), pp.8106-8109.

Sriharitha, R., Murty, B.S. and Kottada, R.S., 2014. Alloying, thermal stability and strengthening in spark plasma sintered AlxCoCrCuFeNi high entropy alloys. Journal of Alloys and Compounds, 583, pp.419-426.

Praveen, S., Murty, B.S. and Kottada, R.S., 2013. Phase evolution and densification behavior of nanocrystalline multicomponent high entropy alloys during spark plasma sintering. JOM, 65(12), pp.1797-1804.

Krishna, S.C., Tharian, K.T., Pant, B. and Kottada, R.S., 2013. Microstructure and mechanical properties of Cu-Ag-Zr alloy. Journal of materials engineering and performance, 22(12), pp.3884-3889.

Chawake, N., Paleti, S.H.K., Murty, B.S. and Kottada, R.S., 2013. Synthesis and Characterization of Spark Plasma Sintered FeAl and In situ FeAl–Al 2 O 3 Composite. Transactions of the Indian Institute of Metals, 66(4), pp.419-424.

Praveen, S., Anupam, A., Sirasani, T., Murty, B.S. and Kottada, R.S., 2013. Characterization of oxide dispersed AlCoCrFe high entropy alloy synthesized by mechanical alloying and spark plasma sintering. Transactions of the Indian Institute of Metals, 66(4), pp.369-373.

Sriharitha, R., Murty, B.S. and Kottada, R.S., 2013. Phase formation in mechanically alloyed AlxCoCrCuFeNi (x= 0.45, 1, 2.5, 5 mol) high entropy alloys. Intermetallics, 32, pp.119-126.

Praveen, S., Murty, B.S. and Kottada, R.S., 2012. Alloying behavior in multi-component AlCoCrCuFe and NiCoCrCuFe high entropy alloys. Materials Science and Engineering: A, 534, pp.83-89.

Krishna, S.C., Thomas Tharian, K., Pant, B. and Kottada, R.S., 2012. Age-hardening characteristics of Cu-3Ag-0.5 Zr alloy. In Materials Science Forum (Vol. 710, pp. 563-568). Trans Tech Publications.

Sen, I., Kottada, R.S. and Ramamurty, U., 2010. High temperature deformation processing maps for boron modified Ti–6Al–4V alloys. Materials Science and Engineering: A, 527(23), pp.6157-6165.

Kottada, R.S. and Chokshi, A.H., 2007. Grain boundary sliding during diffusion and dislocation creep in a Mg-0.7 pct Al alloy. Metallurgical and Materials Transactions A, 38(8), pp.1743-1749.

Kottada, R.S. and Chokshi, A.H., 2005. Low temperature compressive creep in electrodeposited nanocrystalline nickel. Scripta materialia, 53(8), pp.887-892.

Chokshi, A.H. and Kottada, R.S., 2005. The deformation characteristics of nanocrystalline metals. Transactions of the Indian Institute of Metals, 58(6), pp.939-950.

Kottada, R.S. and Chokshi, A.H., 2004. High Temperature Deformation Behaviour of a Mg-0.8 Al Alloy. In Materials Science Forum (Vol. 447, pp. 227-232). Trans Tech Publications.

Kottada, R.S. and Chokshi, A.H., 2003. Hot working of an as-Cast Mg-2% Al alloy. In Materials Science Forum (Vol. 426, pp. 4417-4422). Trans Tech Publications.

Kottada, R.S. and Chokshi, A.H., 2000. The high temperature tensile and compressive deformation characteristics of magnesia doped alumina. Acta materialia, 48(15), pp.3905-3915.

Kottada, R.S. and Chokshi, A.H., 2000. Is there diffusion creep in alumina?. In Key Engineering Materials (Vol. 171, pp. 779-786). Trans Tech Publications.

Satapathy, L.N., Kottada, R.S. and Chokshi, A.H., 1999. An experimental technique for fabricating tensile ceramic specimens. Scripta materialia, 41(10), pp.1091-1095.