Al-3.6Cu-1.6Mg-0.1Zr铝合金的时效析出与硬化机理分析  

Analysis on Precipitation and Hardening Mechanism of Al-3.6Cu-1.6Mg-0.1Zr Alloy During Artificial Aging

作　　者：邓才智[1] 刘志义[1] 马飞跃[1] 喻翠平[1] 韩向楠[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2008年第22期48-51,55,共5页Hot Working Technology

基　　金：国家重点基础研究发展计划资助项目(2005CB623705-04)

摘　　要：通过硬度检测、DSC热分析和透射电镜(TEM)观察,研究了人工时效制度对Al-3.6Cu-1.6Mg-0.1Zr合金组织和性能的影响。结果表明,在160、175和190℃进行人工时效时,对应峰值硬度的时效时间分别为32、24和16 h,硬度峰值随时效温度的提高而下降。在160、175℃时效后,时效硬化曲线呈现明显的双阶段硬化特征。研究表明,第一阶段的硬化主要是由于GPB区的形成;第二阶段的硬化可归结为S'相的析出。The effects of artificial aging parameters on microstructure and mechanical properties of Al-3.6Cu-1.6Mg-0.1Zr alloy were investigated by means of Viekers hardness measurement, differential scanning calorimetry （DSC） and transmission electron microscopy （TEM） observation. The results show that the artificial aging time corresponding to peak value of hardness is 32, 24 and 16 h respectively when aged at 160, 175 and 190 ℃, while hardness values decrease with the increase of aging temperature. Apparent two-step hardening effect appears in the curve of hardness when samples are aged at 160 and 175℃. It is suggested that the first stage of aging hardening is due to the formation of GPB zone, and the second stage of aging hardening is attributed to the precipitation of S＇ phase.

关 键 词：Al-Cu—Mg铝合金 人工时效 维氏硬度 

分 类 号：TG156.92[金属学及工艺—热处理]