Resolution of the influence for the insoluble impurity atoms on solute drag creep and hot ductility

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06494
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Kagawa National College of Technology
• Principal Investigator: ITO TSUTOMU 香川高等専門学校, 機械工学科, 准教授 (00409038)
• Co-Investigator(Kenkyū-buntansha): 本間 智之 長岡技術科学大学, 工学研究科, 准教授 (50452082) ; 水口 隆 愛媛大学, 理工学研究科(工学系), 准教授 (00462515)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 溶質雰囲気引きずり運動 / 熱間延性 / 第2相粒子 / 不純物原子 / 高温変形機構

Outline of Final Research Achievements

Effects of second-phase particle on hot ductility of Al－Mg alloys, irrespective of the addition of impurity atoms, were investigated, and the following results obtained.
[1] The average grain size of each alloy before high-temperature tensile tests was about 20 to 30 μm. [2] The average grain size of the second-phase particles existing in each alloy is about 1 mm, and the area fraction is less than 3%. Large elongations of over 200% were obtained in the wide test conditions of each alloy. [2] From the viewpoint of stress exponent and activation energy for deformation, the dominant deformation mechanism for the large elongation obtained is considered to be solute drag creep, which is rate-controlled by the interdiffusion of Mg in Al. [3] The superplastic-like elongation of over 200% is obtained because the area fraction of the second-phase particles is slightly less than 3%.

Free Research Field

材料物理学，材料強度物性学