摘要
在Gleeble-1500热模拟实验机上对Al-6Zn-2Mg-0.2Sc-0.1Zr合金进行等温压缩试验,建立了该合金在变形温度为350～500℃、应变速率为1～10 s-1条件下的热加工图。利用光学显微镜和扫描电镜观察了不同变形程度下合金的组织和热裂纹,确定了适宜的变形参数。结果表明:Al-6Zn-2Mg-0.2Sc-0.1Zr合金高温变形的峰值应力随变形温度的升高而降低,其适宜的热加工温度和应变速率范围为:T>440℃,1.4 s-1<ε<3.5 s-1,单道次变形量小于60%。
The hot processing map of Al-6Zn-2Mg-0.2Sc-0.1Zr aluminum alloy was established by isothermal compression at 350～500 ℃ and strain rate of 1～10 s-1 using Gleeble-1500 hot simulation machine.The microstructure and hot crack of the samples after compression were studied by optical microscopy（OM） and scanning electron microcopy（SEM）,and the feasible deformation reduction was determined.The results show that the peak stress decreases with the increase of deformation temperature when the alloy deforms at high temperature.The feasible deformation temperature and strain rate is as follows： T440 ℃,1.4 s-1ε3.5 s-1,single-pass deformation is less than 60%.
出处
《热加工工艺》
CSCD
北大核心
2010年第16期41-44,共4页
Hot Working Technology
基金
湖南省科技计划项目(2009GK3038)
