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2023 Fiscal Year Final Research Report

Development of high temperature shape memory alloy based on the shear and shuffling mechanism accompanying to martensitic transformation

Research Project

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Project/Area Number 20H02427
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 26010:Metallic material properties-related
Research InstitutionKumamoto University

Principal Investigator

MATSUDA Mitsuhiro  熊本大学, 大学院先端科学研究部(工), 准教授 (80332865)

Co-Investigator(Kenkyū-buntansha) 赤嶺 大志  九州大学, 総合理工学研究院, 助教 (40804737)
Project Period (FY) 2020-04-01 – 2024-03-31
Keywordsマルテンサイト変態 / 高温形状記憶合金 / 原子変位 / 自己調整構造 / ハフニウム基合金 / ジルコニウム基合金 / 変態温度
Outline of Final Research Achievements

We focus on the shear and shuffling mechanism accompanying to martensitic transformation to develop the high temperature shape memory alloy. We have clarified the microstructure and crystallography of martensite variants in Hf- and Zr-based alloys. The crystal structure of martensite and self-accommodation are closely related to the shear and shuffling mechanism. The movement of each martensitic variant and self-accommodation by applied strain was also clarified. These obtained results and discussion are very useful to understand martensitic transformation, leading to improve the high temperature shape memory characteristics.

Free Research Field

材料組織学

Academic Significance and Societal Importance of the Research Achievements

二酸化炭素および化石燃料使用量を削減するための取り組みとして,制御・計測機器の軽量化を目的とした高温形状記憶合金の開発が進められている。本研究では,形状記憶特性を担う熱弾性型マルテンサイト変態の原子変位機構に着目し,高温に変態温度を有するHfおよびZr基合金マルテンサイトバリアントの内部組織や自己調整構造について明らかにすることで,高温形状記憶・超弾性合金の特性向上に関する新たな材料設計指針が得られたことから,社会的意義もある研究成果といえる。

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Published: 2025-01-30  

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