Takahisa Shiraishi

Associate Professor, Magnesium Research Center, Kumamoto University *Profile is at the time of the award.

2024Inamori Research GrantsScience & Engineering

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Research topics: Elucidation of self-formation mechanism of unique periodic arrangement structure: development of titanium alloys

Keyword

Summary: The functionality of metallic materials is highly dependent on their microstructure, which is composed of various crystalline phases. The purpose of this study is the elucidation of the formation mechanism of the unique microstructure (periodically arranged microstructure with compositional modulation) found in titanium alloy. Through this, we aim to develop a high-performance titanium alloy that will contribute to "lightening transport aircraft," which is essential for solving energy and environmental issues.

Message

I would like to express my gratitude for being selected for the Inamori Foundation Research Grant. By continuing to develop this study, I will explore new possibilities as a lightweight structural material in Ti alloy.

Outline of Research Achievments

This study aimed to introduce a unique periodic ordered structure into Ti-Zr alloys, and explored the conditions for its formation. As a result, the formation mechanism of the core compositionally modulated structure was clarified, and by adding a β-phase stabilizer as a third element, an α/β periodic ordered structure was successfully introduced. In particular, universal conditions were found for the added concentration that are independent of the element type, and a process map was obtained for controlling the periodic ordered structure.

Takahisa Shiraishi et.al., (2025) Formation of Compositional Modulated Microstructure in Ti-Zr Binary Alloys, Materials Transactions, Vol. 66

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