2018 Fiscal Year Final Research Report

Quest for fundamental dynamics of domain homo interface in shape change materials and principles for high performance materials

Research Project

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Project/Area Number	26220907
Research Category	Grant-in-Aid for Scientific Research (S)
Allocation Type	Single-year Grants
Research Field	Structural/Functional materials
Research Institution	Tokyo Institute of Technology
Principal Investigator	HOSODA Hideki 東京工業大学, 科学技術創成研究院, 教授 (10251620)
Co-Investigator(Kenkyū-buntansha)	上杉徳照大阪府立大学, 工学(系)研究科(研究院), 准教授 (10405342) 曽根正人東京工業大学, 科学技術創成研究院, 教授 (30323752) 稲邑朋也東京工業大学, 科学技術創成研究院, 教授 (60361771) 田原正樹東京工業大学, 科学技術創成研究院, 助教 (80610146) 舟窪浩東京工業大学, 物質理工学院, 教授 (90219080)
Research Collaborator	KANETAKA hiroyasu CHANG tsu-fu mark SHINOHARA yuri CHERNEMKO volodymyr
Project Period (FY)	2014-05-30 – 2019-03-31
Keywords	形状可変材料 / 相変態 / 第一原理計算 / 界面制御 / 医療・エネルギー材料 / 多機能材料
Outline of Final Research Achievements	In shape-change materials such as shape memory alloys and piezoelectric materials used for medical and energy applications, external fields such as force and magnetic field and material functions are deeply related each other。 The origin of the shape change is the domain rearrangement and phase transformation due to the motion of domain homo interface. In order to improve the material functions, the structure and dynamics of the domain homo interface have been clarified for the smooth motion with low friction. Principles for the control of interface structure and lattice softening from the first principle calculations have been established to reduce the friction of motion for the enhancement of higher functionality. Moreover, several multifunctional and high performance new shape change materials have been developed.
Free Research Field	材料工学
Academic Significance and Societal Importance of the Research Achievements	従来深く考えられていなかったホモドメイン界面構造を掘り下げ、幾何学的にまた実験的に明らかにした。特に、相安定性と結晶格子の軟化現象を結びつけ、予測した界面のねじれが実在することやその生成過程を明らかにした。本研究により、疲労変化の極めて少ない形状記憶合金、巨大な変形を示すチタン合金や磁場駆動複合材料、より高速応答の可能な強誘電体など、今後の医療・エネルギー分野で大きな工業発展が期待できる新材料を開発できた。