自然时效对7085铝合金力学性能的影响  

Influence of Natural Aging on Mechanical Properties of 7085 Aluminum Alloy

作　　者：李群 LI Qun(School of Material Science and Engineering,Central South University,Changsha 410083,China)

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：《铝加工》2018年第2期4-7,共4页Aluminium Fabrication

基　　金：国家重点研发计划(2016YFB0300901)

摘　　要：通过室温拉伸实验研究了自然时效对7085铝合金力学性能的影响,并结合透射电镜以及差示扫描量热法对其影响机理进行分析。结果表明,随着自然时效时间从0h延长到168h,7085铝合金的抗拉强度从552MPa下降到535MPa,这是由于延长自然时效导致晶内析出的η′相尺寸粗化、密度降低所造成的。The influence of natural aging on mechanical properties of 7085 aluminum alloy was investigated by means of tensile test at room temperature;the mechanism was discussed combining with transmission electron microscopy(TEM)and differential scanning calorimetry(DSC).The main conclusions are as follows:the tensile strength of 7085 aluminum alloy decreases from 552MPa to 535MPa with natural aging time increases from 0h to 168h,which contributes to larger and coarserη'phase in grains with prolong.ing the natural aging time.

关 键 词：自然时效 7085铝合金 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]