RESEARCH

Our core research areas span metallic materials such as steels, aluminum, titanium, and tantalum alloys. We integrate advanced experimental characterization with finite element modeling (FEM) to understand deformation, creep, and microstructure–property relationships. A major focus is on solid-state joining technologies, including friction stir welding (FSW) and electrically assisted pressure joining (EAPJ). We also investigate corrosion and stress corrosion cracking (SCC) through combined experimental testing and modeling approaches. Overall, our research aims to establish fundamental mechanisms and predictive frameworks for structural integrity and reliability of advanced materials.

We study comprehensive research framework for noble composite joint (NCJ). We cover the entire process chain, from manufacturing and process design to finite element (FE) modeling of thermal, electrical, and mechanical fields. Detailed microstructural analyses are conducted to reveal phase evolution, deformation, and interfacial characteristics. Mechanical performance and electrochemical behavior are systematically evaluated to assess joint integrity and durability. By integrating experiments and modeling, we establish structure–process–property relationships for reliable joint design.

We are very interested with the application of advanced metallic and composite materials for space and extreme-environment systems. Our research targets radiation-shielding materials for space environments and heat-resistant structural materials for thermally extreme conditions. High-temperature and high-pressure engine components are developed using metal-matrix and hybrid composites. For vacuum and low-gravity environments, we study low-wear and high-durability materials for moving and contact parts. Overall, the work supports reliable material and structural solutions for space exploration, propulsion, and autonomous systems operating under extreme conditions.

We study integrated research on microstructural engineering for enhanced mechanical performance and durability in aluminum-based materials. Firstly, we demonstrate how friction stir processing enables uniform dispersion and stabilization of graphene oxide (GO) in aluminum, leading to a synergistic improvement in strength and ductility. Multi-scale characterization reveals the role of GO–matrix interactions, dislocation structures, and localized hardening in governing mechanical behavior. Secondly, we focus on precipitation control in Al–Mg–Si(-Cu) alloys, highlighting the trade-off between strengthening and corrosion resistance. By combining tailored aging strategies, advanced characterization, and electrochemical analysis, we establish processing routes that balance mechanical performance and corrosion durability.

We study corrosion resistance and hydrogen embrittlement in titanium alloys. We investigate the influence of hydrogen charging and processing conditions on hydrogen uptake, penetration depth, and hydride formation. Electrochemical and microstructural analyses are combined to clarify the mechanisms governing hydrogen-assisted degradation. Alloying strategies, such as chromium addition, are explored to enhance corrosion resistance and suppress stress corrosion cracking. Through integrated experiments and characterization, we propose alloy design guidelines for titanium alloys with improved durability in aggressive environments.

We are trying to develop cost-effective manufacturing processes for refractory metals, with a focus on tantalum (Ta). We address the limitations of conventional fabrication methods by applying friction stir spot welding to achieve sound joints with refined, partially recrystallized microstructures. Microstructural evolution and mechanical reliability are systematically evaluated to validate joint performance. In parallel, the effects of high-temperature hydrogen charging on microstructure, hardness, and hydrogen penetration depth are investigated. These integrated studies provide practical processing routes for reliable and economical manufacturing of high-performance tantalum components.

We study the creep deformation behavior of three-dimensional woven (WS) metallic structures. A Ni–20Cr woven lattice is designed and analyzed at the unit-cell level to capture geometry-driven deformation mechanisms. Vapor-phase processing is employed to introduce alloying elements and coatings, enabling tailored microstructures within the woven struts. Finite element analysis reveals localized stress, creep strain distribution, and buckling behavior under high-temperature loading. The results demonstrate how combined architectural design and compositional control enhance creep resistance in advanced woven structures.

We study the thermal behavior of system-on-chip (SoC) devices under increasing integration and power density. We analyze heat generation and thermal issues arising in advanced SoC applications such as automotive, medical devices, and the Internet of Things. Finite element heat-transfer models are developed and rigorously validated using infrared (IR) thermography. Data generated from the FE models are further used to train graph convolutional network (GCN) models for fast and accurate temperature prediction. The integrated modeling framework achieves high prediction accuracy while significantly reducing computational time for thermal management design.