7075铝合金热压缩过程变形行为和载荷研究  

Research on Deformation Behavior and Load of 7075 Aluminum Alloy During Hot Compression

作　　者：包立[1] 王东歌[1] 张春丽[1] 王学利 王雪[1] 梅瑞斌[1] 

机构地区：[1]东北大学秦皇岛分校资源与材料学院,河北秦皇岛066004 [2]华安工业有限责任公司,黑龙江齐齐哈尔150090

出　　处：《中国材料科技与设备》2014年第1期40-42,共3页Chinese Materials Science Technology & Equipment

基　　金：河北省高等学校科学技术研究青年基金（QN20132007）;秦皇岛市科技计划项目（2012021A105）;东北大学大学生科技创新基金（13604）

摘　　要：采用MMS-300多功能材料试验机对7075铝合金在变形温度300-450℃、应变速率0．01～40s^-1下单道次压缩过程进行了实验研究，并根据其流变曲线对热压缩过程进行了数值模拟，分析了变形速度、温度和摩擦对变形栽荷的影响规律。结果表明：7075铝合金变形过程发生了动态再结晶，应力-应变曲线表现出波浪形，波动周期大致相同，振幅随着应变增加逐渐减小；变形速度较小时，变形速度增加，临界应变增加，变形速度增加到一定程度时临界应变反而降低。随着变形速率增加和变形温度降低，载荷增加，而摩擦对7075铝合金热压缩过程的栽荷影响不大；当变形速率增加到一定值时，载荷值对速度敏感度降低。The flow stress behavior of the 7075 aluminum alloy was studied through single--pass compression experiment by using MMS--300 simulator within temperature range of 300--450℃ and strain rate range of 0. 01--40s^-1. Then a simula- tion of compression was carried out and the influence of deformation velocity on load was investigated according to the relation- ship between stress and strain. The results show that dynamic recrystallization occurs in hot compression of 7075 alloy and the stress--strain curves are presented as wave. Increasing of deformation velocity results in higher critical strain but the value decreases when the deformation is much higher. The deformation load increase with the increase of deformation velocity and decrease of temperature. However, the effect of deformation velocity on load becomes weaken when the deformation velocity reaches to some of extent. Furthermore, the effect of friction on the deformatian load is not significantly.

关 键 词：热压缩试验 7075铝合金 应力应变 变形载荷 

分 类 号：TG317[金属学及工艺—金属压力加工]