选择性激光表面处理对2060 Al-Li合金的塑性的影响  

Effects of Selective Laser Surface Treatment on Plasticity of 2060 Al-Li Alloy

作　　者：程声昊 吴翔 白浩玮 刘玉敬 王一浩 王金成 CHENG Shenghao;WU Xiang;BAI Haowei;LIU Yujing;WANG Yihao;WANG Jincheng(College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410004;College of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240;College of Engineering,The University of Western Australia,Perth,Australia,6009)

机构地区：[1]长沙理工大学材料科学与工程学院,长沙410004 [2]上海交通大学材料科学与工程学院,上海200240 [3]西澳大学工程学院,珀斯6009

出　　处：《特种铸造及有色合金》2025年第3期334-341,共8页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52001030,52204371)。

摘　　要：通过原位拉伸二维应变试验和分子动力学模拟系统研究了激光间隔扫描工艺对2060 Al-Li合金拉伸变形行为的影响。结果表明,激光间隔扫描在2060 Al-Li合金表面形成粗晶和细晶交替排列的微观组织,并显著提高其塑性。间隔激光扫描处理试样在塑性应变过程中出现局部塑性变形特性,交替排列的粗晶和细晶微观结构可以改变拉伸剪切带扩展方向,减缓了剪切变形区微裂纹形成和扩展,提高其伸长率。激光处理后的2060 Al-Li合金的总伸长率提高了47.2%。The influence of laser interval scanning process on tensile and deformation behavior of 2060 Al-Li alloy was systematically investigated by in-situ tensile two-dimensional strain(DIC)experiments and molecular dynamics simulations.The results indicate that laser interval scanning leads to a microstructure with alternating coarse and fine grains on the surface of 2060 Al-Li alloy,significantly enhancing elongation.Localized plastic deformation occurs in the interval laser-scanned specimens during tensile deformation,and alternating microstructure of coarsed and fine grains after interval scanning can alter the propagation direction of tensile shear bands,retarding the formation and growth of microcracks at shear deformation regions,furthering improving the ductility.The total elongation of laser-treated 2060 Al-Li alloy is increased by 47.2%.

关 键 词：AL-LI合金 EBSD 二维应变 激光重熔 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]