Development of dynamic analysis method for the cluster formation behavior by using dislocations

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22036
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Hokkaido University
• Principal Investigator: IKEDA Ken-ichi 北海道大学, 工学研究院, 准教授 (20335996)
• Co-Investigator(Kenkyū-buntansha): 高田 健 大同大学, 工学部, 教授 (60373586)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: クラスタ形成 / 転位 / 力学応答 / クリープ変形 / 電気抵抗 / 析出物形成 / 組織形成

Outline of Final Research Achievements

It is well known that aging products such as clusters of alloying elements and precipitates are formed when supersaturated solid solution alloys are heated and that these aging products affect the strength of the alloys. In this study, we aimed to develop a method to dynamically analyze the formation process of these aging products. We conducted a creep test method using dislocations responsible for plastic deformation as detection probes and an evaluation focusing on changes in electrical resistivity. It was found that there were differences in micro-deformation behavior and changes in electrical resistivity depending on the aging products. In this research period, issues for dynamic evaluation were extracted and future research development was discussed.

Free Research Field

材料組織学・材料強度学

Academic Significance and Societal Importance of the Research Achievements

本研究は、クリープ試験や電気抵抗率測定のようにこれまで様々な研究で用いられている手法を応用して、時効生成物の形成挙動を動的に捉えることに取り組んだ。研究期間内では、動的に時効生成物の形成を評価することはできなかったが、抽出した課題を達成できれば、数十年に渡って行われている時効析出現象の研究に新たな視点を加えることができると考え、学術的意義は非常に高いと考えている。