Al-6Zn-2Mg-0.2Sc-0.1Zr合金的热变形工艺研究
Study on Hot Deformation Process for Al-6Zn-2Mg-0.2Sc-0.1Zr Al alloy
向 伟1,2, 李慧中1, 梁霄鹏1, 尹志民1
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作者单位：1. 中南大学 材料科学与工程学院, 湖南 长沙 410083; 2. 湘西民族职业技术学院 机电工程系, 湖南 吉首 416000
中文关键字：Al-6Zn-2Mg-0.2Sc-0.1Zr合金； 热变形工艺； 显微组织； 热裂纹
英文关键字：Al-6Zn-2Mg-0.2Sc-0.1Zr aluminum alloy; hot deformation technology; microstructure; hot crack
中文摘要：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＜■＜3.5 s-1，单道次变形量小于60%。
英文摘要：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: T＞440 ℃，1.4 s-1＜■＜3.5 s-1, single-pass deformation is less than 60%.