High-temperature materials are used in aircraft jet engines and gas turbines in thermal power plants. This laboratory focuses on Ti alloys used in jet engine compressors and high-temperature shape memory alloys that are expected to be used in various high-temperature devices, aiming to control microstructures and improve high-temperature mechanical properties by processes. In particular, we are challenging the produce of high-performance materials by 3D additive manufacturing, which has recently attracted attention, the application of high-entropy alloys, which are expected to be used as new structural materials to heat-resistant materials and shape memory alloys, and the design of 1300°C-class Nb alloys. We are also challenging to understand phase stability and mechanical properties from electronic structures using first-principles calculations. Specific research topics are as follows

1. Elucidation of high temperature deformation mechanism of high entropy alloys (structural materials, shape memory alloys)
2. Producing of high-temperature materials using 3D additive manufacturing
3. Producing of super heat-resistant Nb alloys and heat-resistant Ti alloys for aircraft jet engines
4. Understanding of phase stability and mechanical properties from electronic structure

1. J. Saha, P. V. Cobbinah, T. Hiroto, S. Matsunaga, Y. Toda, Y. Yamabe-Mitarai, Evolution of microstructure and texture in Al-containing CoCrNi medium entropy alloys during severe warm-rolling, Mater. Char., 207 (2024) 113546.
2. S. Matsunaga, K. Komamura, Y. Yamabe-Mitarai, Phase equilibrium and high-temperature mechanical properties of Nb-Si-X ternary alloys, Metall. Mater. Trans. A, 54A (2023) 4598-4605.
3. Y. Yamabe-Mitarai, T. Inoue, T. Kuroda, S. Matsunaga, Y. Toda, T. Matsunaga, T. Ito, R. Ozasa, T. Ishimoto, T. Nakano, Creep Behavior of Ti-6Al-4Nb-4Zr Fabricated by Powder Bed Fusion Using a Laser Beam, Mater. Trans., 64, 6 (2023) 1175-1182.