离心铸造和热轧对Mg-10Gd-3Y-1Sn合金组织和机械性能的影响  

Effects of Centrifugal Casting and Hot Rolling on Microstructure and Mechanical Properties of Mg-10Gd-3Y-1Sn Alloy

作　　者：马振铎 杨艳[1,2] 彭强 付雪松 魏国兵[1,2] 谢卫东 彭晓东[1,2] Ma Zhenduo;Yang Yan;Peng Qiang;Fu Xuesong;Wei Guobing;Xie Weidong;Peng Xiaodong(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆大学国家镁合金材料工程技术研究中心,重庆400044

出　　处：《稀有金属材料与工程》2022年第3期858-865,共8页Rare Metal Materials and Engineering

基　　金：National Key Research and Development Program of China(2016YFB0700403);National Natural Science Foundation of China(51571040);Chongqing Research Program of Basic Research and Frontier Technology(cstc2019jcyj-msxmX0306,cstc2019jcyj-msxmX0539);Fundamental Research Funds for Central Universities(2021CDJJMRH-001);111 Project of Ministry of Education and State Administration of Foreign Experts Affairs of China(B16007);Sharing Fund of Chongqing University Large-Scale Equipment(201612150024,201612150092)。

摘　　要：采用离心铸造及热轧工艺制备Mg-10Gd-3Y-1Sn合金,利用X射线衍射、光学显微镜、扫描电子显微镜和拉伸试验对该合金的组织和力学性能进行了研究。结果表明:离心铸造Mg-10Gd-3Y-1Sn合金由α-Mg、Mg_(24)(Gd,Y)5、Mg_(2)(Sn,Y)3Gd2和Mg_(3)(Gd,Y)相组成。随着离心半径和离心转速的增大,Mg-10Gd-3Y-1Sn合金的晶粒尺寸逐渐减小,抗拉伸强度逐渐增大。在700 r/min下制备的热轧试样在室温下极限抗拉伸强度为304 MPa,在300℃下极限抗拉伸强度为296 MPa。Mg_(24)(Gd,Y)_(5)、Mg_(2)(Sn,Y)3Gd2和Mg_(3)(Gd,Y)相具有优异的热稳定性,因而Mg-10Gd-3Y-1Sn合金具有优异的高温抗拉伸强度。The Mg-10Gd-3Y-1Sn alloys were prepared by centrifugal casting and hot rolling,and their microstructure and mechanical properties were investigated by X-ray diffraction,optical microscope,scanning electron microscope,and tensile tests.Results show that the centrifugal-cast Mg-10Gd-3Y-1Sn alloy consists ofα-Mg,Mg_(24)(Gd,Y)_(5),Mg_(2)(Sn,Y)3Gd2,and Mg_(3)(Gd,Y)phases.With increasing the centrifugal radius and rotation speed,the tensile strength of alloys is increased gradually due to the decreased grain size of alloys.The ultimate tensile strength of as-rolled alloys after centrifugal casting with the rotation speed of 700 r/min is 304 and 296 MPa at room temperature and 300℃,respectively.The improved tensile strength of Mg-10Gd-3Y-1Sn alloy at elevated temperatures mainly results from the Mg_(24)(Gd,Y)_(5),Mg_(2)(Sn,Y)_(3)Gd_(2),and Mg_(3)(Gd,Y)phases with excellent thermal stability.

关 键 词：Mg-10Gd-3Y-1Sn合金 离心铸造 微观组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.4[金属学及工艺—金属材料] TG335.11[金属学及工艺—金属学]