汽车车架用含钛镁合金的显微组织及力学性能研究  

Microstructure and mechanical properties of titanium magnesium alloy for automobile frame

作　　者：桂林[1] 李强军 Gui Lin;Li Qiangjun(Henan Polytechnic Institute,Nanyang 473009,Henan,China;School of Materials,Henan University,Kaifeng 475001,Henan,China)

机构地区：[1]河南工业职业技术学院,河南南阳473009 [2]河南大学材料学院,河南开封475001

出　　处：《钢铁钒钛》2021年第5期192-196,共5页Iron Steel Vanadium Titanium

基　　金：河南省科技攻关项目(142102310549)。

摘　　要：研究了不同钛含量的汽车车架用含钛镁合金Mg-8Al-1Zn-x Ti(x=0.05, 0.15, 0.3)的显微组织和力学性能,并对比了不含钛Mg-8Al-1Zn合金的显微组织和力学性能。结果表明:钛的添加,细化了合金晶粒,改善了合金力学性能。随钛含量增加,合金平均晶粒尺寸先减小后增大、力学性能先提高后下降。与不含钛Mg-8Al-1Zn合金相比,含钛Mg-8Al-1Zn-0.15Ti合金的平均晶粒尺寸减小7.2μm、抗拉强度增大32 MPa、屈服强度增大33 MPa、断后伸长率增大3.8%,拉伸断裂方式从混合断裂变为塑性断裂。The microstructure and mechanical properties of Mg-8Al-1Zn-xTi(x=0.05,0.15,0.3)magnesium alloy containing titanium with different titanium contents were tested and analyzed,and the microstructure and mechanical properties of Mg-8 Al-1 Zn alloy without titanium were compared.The results show that the addition of alloy element Ti can refine the alloy grain and improve the mechanical properties of the alloy.The average grain size of the alloy first decreases and then increase,and the mechanical properties first improves and then declines.Compared with Mg-8 Al-1Zn alloy without Ti,the average grain size of Mg-8 Al-1Zn-0.15Ti alloy containing Ti decreases by 7.2μm,tensile strength increases by 32 MPa,yield strength increases by 33 MPa,the elongation after fracture increases by 3.8%,and the tensile fracture mode changes from mixed fracture to plastic fracture.

关 键 词：镁合金 汽车车架 Ti 微合金化 显微组织 力学性能 

分 类 号：TF823[冶金工程—有色金属冶金] TG146.22[一般工业技术—材料科学与工程]