机械研磨处理对LY2硬铝合金高温力学性能的影响  

Effect of Mechanical Attrition Treatment on Elevated-temperature Mechanical Properties of Duralumin Alloy LY2

作　　者：田龙[1] 刘玲[1] 何强[1] 

机构地区：[1]安阳工学院机床关键功能部件重点实验室,河南安阳455000

出　　处：《铸造技术》2014年第7期1494-1497,共4页Foundry Technology

基　　金：安阳工学院校级青年基金资助项目(安工201304)

摘　　要：研究了机械研磨处理对LY2硬铝合金高温力学性能的影响。结果表明,机械研磨处理后,铝合金表层呈高幅值残余压应力状态。并且随着研磨时间的增加,残余压应力逐渐增大,晶粒逐渐细化。随着拉伸温度的升高,LY2硬铝合金抗拉强度及屈服强度均降低,而合金伸长率则增大,拉伸断口上韧窝尺寸变大变深,表明合金塑性得到改善。The effect of surface mechanical attrition treatment（SMAT） on the elevated-temperature mechanical properties of the duralumin alloy LY2 was investigated. The results show that the high-magnitude residual compressive stress exists on the surface of the alloy after SMAT. The stress increases and grains are refined with the increase of SMAT time. The tensile and yield strength decrease but the elongation increases with the increase of the tensile temperature, and the dimples on the tensile fracture becomes larger and deeper, which indicates that the plasticity of the alloy is improved.

关 键 词：表面机械研磨处理 高温力学性能 LY2硬铝合金 拉伸断口 

分 类 号：TG146.21[一般工业技术—材料科学与工程]