预变形对2197铝锂合金显微组织和力学性能的影响  

The Role of Plastic Deformation on Microstructure and Mechanical Properties of 2197 Al-Li Alloy

作　　者：魏修宇[1] 郑子樵[1] 潘峥嵘[1] 陈圆圆[1] 李世晨[1] 陈秋妮[1] 

机构地区：[1]中南大学,湖南长沙410083

出　　处：《稀有金属材料与工程》2008年第11期1996-1999,共4页Rare Metal Materials and Engineering

基　　金：国防科工委'十五'重点项目(MKPT-2004-19ZD)

摘　　要：通过力学性能测试,扫描电镜、透射电镜观察等手段,研究了固溶淬火后不同程度预变形对2197铝锂合金力学性能及显微组织的影响。结果表明:随着预变形量的增加,合金的时效响应加快,其强度达到峰值的时间逐渐缩短,且峰值强度明显提高。预变形的加入显著促进了基体中T1相的均匀、弥散析出,θ′′/θ′相和δ′相析出受到抑制。The effects of plastic deformation prior to artificial aging on the microstructure and tensile properties of 2197 Al-Li alloy were investigated through tensile test, SEM and TEM. The results show that the aging hardening response of 2197 alloy increases obviously with the increase of plastic deformation after quenching, which enhanced the peak-aged tensile strength. And this effect becomes more obvious with the pre-deformation ratio increasing. The plastic deformation remarkably promotes the matrix T1 precipitation and makes its distribution more dispersive and homogeneous. Meanwhile, the precipitation of θ″/θ′ and δ′ is limited.

关 键 词：2197铝锂合金 预变形 时效 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]