新型改性高强高韧铝合金的组织和性能  

Microstructure and Properties of New Type of High Strength and Ductility Aluminum Alloy

作　　者：罗伟[1] 王均[1] 熊计[1] 张太平[1] 杨启平 钟宇[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065 [2]成都阳光铝制品有限公司,四川成都610100

出　　处：《热加工工艺》2012年第7期21-23,共3页Hot Working Technology

基　　金：四川省2009年第三批支撑计划项目(2009GZ0101);科技人员服务企业行动项目(2009GJF00026)

摘　　要：在6061合金的基础上添加混合稀土,设计出一种新的Al-Mg-Si系合金(6061-RE合金)。合金经熔炼和挤压加工后进行淬火、人工时效处理,并利用金相显微镜、扫描电镜及电子万能实验机对合金微观组织和力学性能进行检测分析。结果表明,添加稀土后,铝合金的晶粒得到细化,晶界有少量稀土相析出。添加0.3wt%混合稀土试样的抗拉强度最高,达到了342MPa,其伸长率为11.5%。抗拉强度和伸长率都得到了改善,硬度也有所下降,呈现出良好的力学性能。A new type of AI-Mg-Si alloy was designed, based on 6061-Re alloy. After extrusion, a range of heat treatment conditions such as quenching and artificial ageing were carried out. The microstructure and mechanical properties of the alloy were analyzed with optical microscope ,X-ray diffraction, scanning electron microscope and electronic testing machine. The results show that the grains of the alloy can be refined and there is a small amount of rich rare earth phases precipitated near the grain boundary. The tensile strength and elongation of the 6061-0.3wt%RE alloy reach the highest values： 342MPa and 11.5%. The alloy shows excellent mechanical properties that the tensile strength and elongation are improved, and the hardness decreases.

关 键 词：6061合金 稀土 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]