挤压温度对2A12铝合金组织与性能的影响  

Effect of extrusion temperature on microstructure and properties of 2A12 aluminium alloy

作　　者：王宏颖 彭二宝[1,2] Wang Hongying;Peng Erbao(School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan Hubei 430070,China;School of Mechanical Engineering,Henan Polytechnic Institute,Nanyang Henan 473000,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070 [2]河南工业职业技术学院机械工程学院,河南南阳473000

出　　处：《金属热处理》2020年第5期138-140,共3页Heat Treatment of Metals

基　　金：河南省科技厅科技攻关项目(142102310526);河南省教育厅青年骨干教师资助项目(2015GGJS-202)。

摘　　要：利用扫描电镜(SEM)、万能试验机、维氏硬度计等研究了不同挤压温度对Al-Cu-Mg系2A12合金组织与性能的影响。结果表明:经380~470℃不同温度热挤压后,2A12合金组织中原第二相被挤碎呈岛状,沿挤压方向呈条带状分布,并有小颗粒状第二相弥散分布。随着挤压温度的升高,颗粒状第二相逐渐减少,合金的强度和硬度逐渐升高,伸长率逐渐降低。470℃挤压的2A12合金的抗拉强度、屈服强度和硬度比均匀化态2A12合金分别提高了61. 7%、63. 2%和54. 1%。Effect of extrusion temperature on the microstructure and properties of the Al-Cu-Mg alloy 2A12 was studied by means of scanning electron microscopy( SEM),universal testing machine and Vickers hardness tester. The results show that after hot extrusion between 380-470 ℃,the primary second phase in the 2A12 alloy microstructure is crushed into island-like second phase,strip-like phase distributing along the extrusion direction,and small particle-like second phase is dispersed. With the increase of extrusion temperature,the granular second phase decreases gradually,the strength and hardness of the alloy increase gradually,but the elongation decreases gradually. The tensile strength,yield strength and hardness of the 2A12 alloy extruded at 470 ℃ are increased by 61. 7%,63. 2% and 54. 1%,respectively,which is higher than the homogenized 2A12 alloy.

关 键 词：2A12合金 挤压温度 显微组织 性能 

分 类 号：TG379[金属学及工艺—金属压力加工]