Production of artificially segregation structure and property enhancement in beta titanium alloys

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K05160
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: National Institute for Materials Science
• Principal Investigator: EMURA Satoshi 国立研究開発法人物質・材料研究機構, 構造材料研究センター, 主幹研究員 (00354184)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: ヘテロ構造 / 重ね合わせ圧延 / 重ね合わせ圧縮 / 変形機構 / 第2相析出

Outline of Final Research Achievements

Laminated structures of beta type Ti-Mo alloys with extreme variations in local alloy element content and with localized distributions of rapidly diffusing elements, which are difficult to achieve naturally, were fabricated through high temperature compression bonding or hot roll bonding. The microstructures and elemental distributions were observed. Additionally, small tensile specimens were taken from the laminated structures, and their room temperature tensile properties, post-deformation microstructure, and fracture surface were examined to assess the potential for improved properties through laminated structures.

Free Research Field

材料工学

Academic Significance and Societal Importance of the Research Achievements

本研究から重ね合わせ圧縮接合、重ね合わせ圧延の両手法ともに組成や添加元素量が極端に異なるヘテロ構造の創製に適していること、ヘテロ構造の配置の違いによって引張特性が大きく変化すること、などが知見として得られた。本知見を発展させ、重ね合わせ素材の選択や層構造の構成（枚数、厚さ等）を最適化することで、機械的性質等の特性が大きく向上したヘテロ構造材料が実現可能であると考える。