Suppression of environmental embrittlement in cold worked aluminum alloys with deformation-induced nano clusters

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H03406
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Ibaraki University
• Principal Investigator: Kuramoto Shigeru 茨城大学, 理工学研究科(工学野), 教授 (10292773)
• Co-Investigator(Kenkyū-buntansha): 小林 純也 茨城大学, 理工学研究科(工学野), 助教 (20735104) ; 伊藤 吾朗 茨城大学, 理工学研究科(工学野), 教授 (80158758)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 強度・破壊靭性

Outline of Final Research Achievements

The present study is a basic research to obtain a method to develop high strength aluminum alloys with better resistance to environmental embrittlement. We prepared the aluminum alloy specimens whose strength is raised by the existence of nano clusters induced by cold rolling. Then, the resistance to environmental embrittlement has been evaluated for these specimens. It has been revealed that they showed higher strength than conventionally processed specimens together with better resistance to environmental embrittlement. Also, we have found that alloying elements affect the mechanical properties significantly, and further study will be expected to clarify the method to control the factors that control the mechanical properties.

Free Research Field

金属材料学

Academic Significance and Societal Importance of the Research Achievements

本研究の実施により、加工誘起ナノクラスターを用いて実用超強力アルミニウム合金を実現するための基礎的指針が得られた。特に、合金元素の種類や量が強度特性に及ぼす影響や、ひずみ速度が環境脆化特性に及ぼす影響は新たな知見であり、今後の実用化を考える上で大きなヒントとなる。また、これらの高強度化に関する金属組織学的な知見は、単にアルミニウム合金の機械的特性向上に役立つだけでなく、一般的な金属材料へ広く適用可能なものであり、その学術的、社会的意義は大きいものと考える。