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采用电子万能实验机对橄榄球帽用6061铝合金进行热压缩变形实验,通过光学电镜分析该合金组织变化规律。结果表明,6061铝合金为典型柱状晶结构,应力-应变曲线满足动态再结晶过程。当变形量为60%,应变速率一定时,D2动态再结晶晶粒尺寸和X动态再结晶体积分数均随温度的升高而增加,但D1再结晶晶粒尺寸和Dc最大晶粒尺寸差随温度升高而变小;当温度一定时,D2动态再结晶晶粒尺寸和X动态再结晶体积分数均是随应变速率的变大而不断降低,而D1再结晶晶粒尺寸和Dc最大晶粒尺寸差随温度的增加而变小,随应变速率的变大而变大。
The experiment of hot compression deformation of 6061 aluminum alloy with football cap was carried out by electronic universal testing machine. The microstructure of the alloy was analyzed by optical microscope. The results show that the 6061 aluminum alloy is a typical columnar crystal structure, and the stress-strain curve satisfies the dynamic recrystallization process. When the deformation is 60% and the strain rate is constant, the dynamic recrystallization grain size and the dynamic recrystallization volume fraction of D2 increase with the increase of temperature, but the difference between D1 recrystallization grain size and Dc maximum grain size difference When the temperature increases, the dynamic recrystallization grain size and dynamic recrystallization volume fraction of D2 both decrease with the increase of strain rate. However, the grain size of D1 recrystallization and the maximum grain size of Dc The size difference becomes smaller as the temperature increases, and becomes larger as the strain rate becomes larger.