2021 年 71 巻 8 号 p. 353-355
Al-Zn-Mg alloys with a high amount of Zn (10%) were subjected to high-speed compressive deformation after solution heat treatment, and a slow strain rate tensile test (SSRT) was performed under peak-aging condition. The SSRT under a humid air atmosphere revealed that grain boundary cracks near the surface are highly suppressed when the peak-aged Al-Zn-Mg alloy was pre-deformed with a high-speed.