变形温度对逐点成形的Al-Cu-Li合金组织和性能影响  

Effects of Deformation Temperature on Microstructure and Properties of Point-by-Point Formed Al-Cu-Li Alloy

作　　者：唐子博 包崇军[2] 张劲 李国锋 TANG Zibo;BAO Chongjun;ZHANG Jin;LI Guofeng(Light Alloy Research Institute,Central South University,Changsha 410000,China;Kunming Metallurgical Research Institute,Kunming 650031,China;College of Mechanical&Electrical Engineering,Changsha University,Changsha 410000)

机构地区：[1]中南大学轻合金研究院,湖南长沙410000 [2]昆明冶金研究院,云南昆明650031 [3]长沙学院机电工程学院,湖南长沙410000

出　　处：《热加工工艺》2021年第19期18-22,共5页Hot Working Technology

基　　金：国家重点研发计划重点专项项目(2017YFB0306001)。

摘　　要：通过形貌分析、轮廓测量、厚度测量、硬度测试、室温拉伸试验、电子背散射(EBSD)等方法研究了变形温度对Al-Cu-Li合金逐点成形件成形质量、组织与性能的影响。结果表明:相比于变形温度300℃和400℃,200℃变形时的成形件表面质量、轮廓精度和厚度最优;成形件能达到最理想的强塑性匹配,成形区试样抗拉强度和屈服强度为478MPa和464.8MPa,伸长率为8.2%。随着变形温度的升高,晶粒形貌由等轴晶粒转变为纤维状晶粒再转变为剪切变形晶粒,小角度晶界逐渐增加,变形温度400℃时,小角度晶界比例达到最高,为90.5%。The influences of deformation temperature on forming quality, microstructure and properties of point-by-point forming parts of Al-Cu-Li alloy were studied by means of morphology analysis, contour measurement, thickness measurement,hardness test, room temperature tensile test and electron backscattering(EBSD). The results show that the surface quality,contour accuracy and thickness of the formed parts are optimal at 200℃, compared with those of the deformation temperatures of 300℃ and 400℃. The formed parts can achieve the most ideal strength and plasticity matching, and the tensile strength and yield strength of the samples in the forming area are 478 MPa and 464.8 MPa, and the elongation is 8.2%. With the increase of deformation temperature, the grain morphology changes from equiaxial grain to fibrous grain and then to shear deformed grain, and the grain boundary with small angle gradually increases. When the deformation temperature is 400℃, the proportion of grain boundary with small angle reaches highest, which is 90.5%.

关 键 词：AL-CU-LI合金 逐点成形 变形温度 力学性能 微观组织 

分 类 号：TG319[金属学及工艺—金属压力加工] TG146.21[一般工业技术—材料科学与工程]