温度对7075 铝合金热变形显微组织演化的影响.pdf.pdf

第18 卷第11 期中国有色金属学报 2008 年11 月
The Chinese Journal of Nonferrous Metals Nov. 2008
文章编号:1004-0609(2008)11-1951-07

温度对 7075 铝合金热变形显微组织演化的影响

李俊鹏,沈健,闫晓东,毛柏平,闫亮明

(北京有色金属研究总院,北京 100088)

摘要:采用 Gleeble−1500D 热模拟机对 7075 铝合金进行温度范围 300~400 ℃、恒应变速率为 1 /s 的热压缩实
验。对热变形后材料的显微组织进行透射电镜观察,研究温度对 7075 合金热变形过程中的显微组织演化的影响。
结果表明:在本实验条件下 7075 合金的流变应力曲线为动态回复型流变曲线; 7075 合金的显微组织演变经历由
无规则排布的位错演化成胞状组织、亚晶组织、亚晶长大等过程;温度升高,显微组织的演化过程缩短,变形材
料的亚晶尺寸增大。
关键词:7075 铝合金;显微组织演化;动态回复;热变形
中图分类号:; 文献标识码:A

Effect of temperature on microstructure evolution of
7075 alloy during hot deformation

LI Jun-peng, SHEN Jian, YAN Xiao-dong, MAO Bai-ping, YAN Liang-ming

(General Research Institute for Nonferrous Metals, Beijing 100088, China)

Abstract: pression tests of 7075 aluminium alloy were operated on Gleeble−1500D thermal simulator at a
constant strain rate of 1 /s and a temperature from 300 to 400 ℃. The microstructures of hot deformed alloy were
observed by transmission electron microscopy to research the effect of temperature on microstructure evolution of 7075
Al alloy during hot deformation. The results show that the stress—strain curves under the experimental conditions belong
to the type of dynamic recovery. The microstructure undergoes a process of disordered dislocations to cell structure,
subgrain structure and sub