Clarification of new abnormal grain growth phenomenon induced by phase transformation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289226
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Tohoku University
• Principal Investigator: Omori Toshihiro 東北大学, 工学(系)研究科(研究院), 准教授 (60451530)
• Co-Investigator(Kenkyū-buntansha): 貝沼 亮介 東北大学, 工学(系)研究科(研究院), 教授 (20202004) ; 大沼 郁雄 東北大学, 工学(系)研究科(研究院), 准教授 (20250714)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 結晶粒成長 / 異常粒成長 / 形状記憶合金 / 超弾性

Outline of Final Research Achievements

Abnormal grain growth phenomenon induced by cyclic heat treatment through α→α＋β→β phase transformations was investigated in Cu-Al-Mn and Fe-Mn-Al-Ni alloys. It was found that the subgrain structure forms associated with precipitation of the second phase and that it exists after solution treatment. Annealing at higher temperatures resulted in abnormal grain growth, and the subgrain free zone was observed after migration of the high-angle boundary. The abnormal grain growth can be explained by considering the sub-boundary energy as a driving pressure.

Free Research Field

金属材料科学