Zr+Er及Zr+Y对Al-Mg-Si-Cu-Mn-Cr合金组织和拉伸力学性能的影响  

Effects of Zr+Er and Zr+Y on Microstructure and Tensile Properties of Al-Mg-Si-Cu-Mn-Cr Alloys

作　　者：王晓璐[1] 赵玉涛[1] 焦雷[1] 钱炜[1] 王研[1] WANG Xiaolu ZHAO Yutao JIAO Lei QIAN Wei WANG Yan(School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013)

机构地区：[1]江苏大学材料科学与工程学院,镇江212013

出　　处：《材料导报》2017年第18期72-76,共5页Materials Reports

基　　金：国家自然科学基金(U1664254;51174098);高等学校博士学科点专项科研基金(20133227110023);江苏省自然科学基金(BK20160516);国家博士后基金(2016M591780);江苏省博士后基金(1501029B);江苏大学高级人才启动基金(14JDG125)

摘　　要：采用光学显微镜(OM)、电子显微镜(SEM)、能谱分析仪(EDS)、透射电子显微镜(TEM)和拉伸强度试验研究了0.3%Zr+0.2%Er和0.3%Zr+0.2%Y(质量分数)两种元素组合对Al-0.6Mg-0.9Si-0.5Cu-0.5Mn-0.2Cr合金热处理前后微观组织和力学性能的影响。研究结果表明,两种元素组合的加入均能细化铸态晶粒,其中Zr+Y改性合金的晶粒细化更明显,且两种改性合金铸态的强度和塑性均较基体合金提高。在热处理过程中,两种元素组合会影响合金中弥散相的析出,降低合金的弥散强化效果。最终,Zr+Er改性合金的强度较基体合金提高,而Zr+Y改性合金的强度则较基体降低,两种合金的塑性均较基体降低。The effects of 0.3%Zr＋0.2%Er and 0.3%Zr＋0.2%Y（mass fraction）on the microstructure and mechanical properties of Al-0.6 Mg-0.9 Si-0.5 Cu-0.5 Mn-0.2 Cr（mass fraction）alloy before and after heat treatment were investigated based on optical microscopy（OM）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectrometry（EDS）,transmission electron microscopy（TEM）and tensile test.The results showed that both Zr＋Er and Zr＋Y could refine theα-Al grains,and the latter was more prominent and effective.Furthermore,both of them could improve the strength and ductility of the as-cast Al-0.6 Mg-0.9 Si-0.5 Cu-0.5 Mn-0.2 Cr alloy.With heat treatment,both Zr＋Er and Zr＋Y had a negative influence on the precipitation of dispersed phase in the alloy and resulted in a decrease in dispersion strengthening.Finally,Zr＋Er modified alloy had higher strength than matrix alloy,while Zr＋Y modified alloy had lower strength,and both of them had lower elongation than matrix alloy.

关 键 词：铝合金 微合金化 晶粒细化 弥散相 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]