摘要
采用液压机制备了不同变形次数、总应变均为75%的7A04铝合金材料,使用ISTRON拉伸实验机测试了力学性能,利用金相显微镜分析了微观组织。结果表明:温度为320℃时,由于不完全的不连续动态再结晶导致混晶中大尺寸晶粒的增加,随变形次数增多,变形后的材料强度下降;当温度为480℃时,由于纤维的拉长方向与表面夹角减小,强度随变形次数的增加而增加,仅变形次数为一次时发生了不完全不连续的动态再结晶。在相同变形次数时,480℃的强度高于320℃时的强度。
7A04 aluminum alloy material with 75% total strain and different plastic deformation times was prepared by using hydraulic machine. The mechanical properties were tested with INSTRON tensile machine, and microstructure was observed with optical microscopy. The results show that the strength of the material after deformation decreases with increasing plastic deformation times due to the increasing big grain sizes in mixed grain caused by incomplete discontinuous dynamic recrystallization at 320℃. The strength increases with increasing plastic deformation times due to the decreasing angle between the extended fibrous direction and the surface at 480℃, incomplete discontinuous dynamic recrystallization occur fored only one time plastic deformation . The strength at 480℃ is higher than that of 320℃with the same plastic deformation times.
出处
《热加工工艺》
CSCD
北大核心
2013年第15期130-133,共4页
Hot Working Technology
基金
山西省自然科学基金项目(2011011021-1)
关键词
7A04铝合金
变形次数
不连续动态再结晶
屈服强度
7A04 aluminum alloy
plastic deformation times
discontinuous dynamic recrystallization
yield strength
作者简介
杨勇彪（1971-），男，辽宁省人，讲师，博士后，研究方向为轻合金塑性成形：电话：15034128846；E—mail：yangyongbiao@yahoo．cn
