摘要
采用X射线衍射仪、光学显微镜以及扫描电镜对铸态Mg-11Gd-3Y-xZn-0.5Zr合金显微组织进行观察分析,用拉伸试验机及布氏硬度计对合金力学性能进行测试,结果表明:铸态Mg-11Gd-3Y-0.5Zr合金的组织主要由α-Mg基体、Mg_5(Gd,Y)相和Mg_(24)(Gd,Y)_5相组成,晶粒较为粗大;在加入Zn元素后,合金由α-Mg基体、Mg_5(Gd,Y,Zn)相以及Mg_(12)Zn(Gd,Y)相组成;随着Zn元素加入量的增加,合金的晶粒先细化再粗化,抗拉强度、伸长率和布氏硬度值先升高后降低,当Zn含量为1.1%时,合金的抗拉强度、伸长率和布氏硬度达到最高值,分别为216.9 MPa、4.74%和84.37 HBW,合金的主要强化相为Mg_(12)Zn(Gd,Y)相,强化机制主要为细晶强化。
Microstructure of as-cast Mg-11 Gd-3 Y-xZn-0.5 Zr alloys was observed and analyzed by means of X-ray diffractometer,optical microscope and scanning electron microscopy,and the mechanical properties were tested by tensile tester and Brinell hardness tester.The results show that the microstructure of the as-cast Mg-11 Gd-3 Y-0.5 Zr alloy is mainly composed ofα-Mg matrix,Mg5(Gd,Y)phase and Mg24(Gd,Y)5 phase,and the grain size is coarse.After the addition of Zn elements,the alloys consist ofα-Mg matrix,Mg5(Gd,Y,Zn)phase and Mg12Zn(Gd,Y)phase.With the increase of Zn content,the grain size of the alloys is first refined and then coarsened,and the tensile strength,elongation and Brinell hardness of the alloys first increase and then decrease.When the content of Zn is 1.1%,the tensile strength,elongation and Brinell hardness of the Mg-11 Gd-3 Y-1.1 Zn-0.5 Zr alloy reach the highest value,which are 216.9 MPa,4.74%and 84.37 HBW,respectively.The main strengthening phase of the alloys is Mg12Zn(Gd,Y)phase,and the strengthening mechanism is mainly fine grain strengthening.
作者
王颂博
李全安
陈晓亚
张帅
关海昆
WANG Song-bo;LI Quan-an;CHEN Xiao-ya;ZHANG Shuai;GUAN Hai-kun(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Henan Province,Luoyang 471023,China;School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 740048)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第5期43-48,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51571084
51171059)
