预时效对Al-Zn-Mg-Cu系铝合金组织及硬度的影响  

Effects of Pre-aging on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy

作　　者：张世兴[1] 李晓华[1] 张晓[1] 

机构地区：[1]河南工业大学机电工程学院

出　　处：《特种铸造及有色合金》2011年第4期298-300,393,共3页Special Casting & Nonferrous Alloys

基　　金：河南工业大学科研基金资助项目(09XGG006)

摘　　要：研究了Al-Zn-Mg-Cu系铝合金形变热处理过程中时效制度变化对其组织和性能的影响。结果表明,预时效过程中适当地提高时效温度和延长时效保温时间,可以得到预时效的优化工艺参数;金相观察发现,预时效后合金再结晶明显细化,可观察到明显的析出相;预时效后随着形变量的增加,合金硬度随之增加,当形变量达到40%左右时合金硬度最高,随形变量增加,合金硬度略有下降;变形后的试样再进行终时效处理后,硬度提升不明显。Effects of pre-aging treatment on microstructure and properties of Al-Zn-Mg-Cu alloy during thermo-mechanical treatment process were investigated.The results show that optimized pre-aging parameters can be obtained with proper increasing in aging temperature and holding time.Recrystallizaion grain size can be greatly refined in pre-aged alloy in the presence of precipitates.Hardness of the pre-aged alloy is increased to maximum value with the increase of deformation rate to approximately 40%,and then it is slightly decreased with deformation rate more than 40%.Hardness increase of the deformed alloy after final aging treatment can be ignored.

关 键 词：AL-ZN-MG-CU系铝合金 形变热处理 预时效 显微组织 硬度 

分 类 号：TG113[金属学及工艺—物理冶金]