7A12-T73铝合金模锻件热稳定性研究  

Study on thermal stability of 7A12-T73 aluminum alloy die forgings

作　　者：王亮[1] 汝继刚[1] 李惠曲[1] 伊琳娜[1] 张坤[1] 陈高红[1] 

机构地区：[1]中国航空工业集团公司北京航空材料研究院,北京100095

出　　处：《轻金属》2014年第9期68-72,共5页Light Metals

摘　　要：通过室温拉伸试验、扫描电镜和透射电镜观察,研究了不同温度热暴露100h对7A12铝合金组织和性能的影响。结果表明,热暴露温度低于125℃时,由于晶内及晶界细小的二次析出,导致拉伸强度小幅提高;当热暴露温度超过150℃时,二次析出相开始粗化,合金拉伸强度显著下降。Effects of thermal exposure at different temperature for 100hours on mierostructure and mechanical properties of 7A12 alloy were investigated by means of room temperature tensile test, scanning electron microscopy （SEM） and transmission electron microscopy （ TEM）. It was shown that the tensile strength increased when the exposure temperature was below 125℃, as the new tiny phase was precipitated in the grain and on the grain boundary. When the exposure temperature exceeded 150℃ the tensile strength of 7A12 alloy decrease clearly, due to the coarsening of the precipitated phase.

关 键 词：7A12合金 热稳定性 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]