摘要
采用光学显微镜、扫描电镜、X射线衍射仪和拉伸试验机等研究了不同热处理状态下Mg-12Gd-1Zn-0.5Zr合金的物相、显微组织和力学性能。结果表明:铸态Mg-12Gd-1Zn-0.5Zr合金的组织主要由α-Mg基体、Mg_(5)(Gd,Zn)、Mg_(5)Gd以及Mg_(10)ZnGd(18R-LPSO)相构成。固溶处理后,LPSO相从18R型LPSO转变为14H型LPSO(Mg_(12)ZnGd),时效处理后,合金的组织主要由α-Mg基体、Mg_(5)Gd和Mg_(12)ZnGd相组成;Mg-12Gd-1Zn-0.5Zr合金的最佳热处理工艺为500℃固溶处理10 h+225℃时效12 h,此时合金的抗拉强度和屈服强度由铸态的192.16和110.24 MPa增加到243.10和159.36 MPa,伸长率由12.64%降低到11.66%。
Phase,microstructure and mechanical properties of Mg-12Gd-1Zn-0.5Zr alloy after different heat treatments were studied by means of optical microscope,scanning electron microscopy,X-ray diffractometer and tensile testing machine.The results show that the microstructure of the as cast Mg-12Gd-1Zn-0.5Zr alloy is mainly composed ofα-Mg matrix,Mg_(5)(Gd,Zn),Mg_(5)Gd and Mg_(10)ZnGd(18RLPSO)phases.After solution treatment,the LPSO phase changes from 18R-LPSO to 14H-LPSO(Mg_(12)ZnGd).After aging treatment,the microstructure of the alloy is mainly composed ofα-Mg matrix,Mg_(5)Gd and Mg_(12)ZnGd phases.The optimal heat treatment process of the Mg-12Gd-1Zn-0.5Zr alloy is solution treatment at 500℃for 10 h plus aging at 225℃for 12 h,and after the treatment,the tensile strength and yield strength of the alloy increase from 192.16 MPa and 110.24 MPa(as cast)to 243.10 MPa and 159.36 MPa,and the elongation decreases from 12.64%to 11.66%.
作者
孙瑞雪
陈君
陈晓亚
李全安
兖利鹏
SUN Rui-xue;CHEN Jun;CHEN Xiao-ya;LI Quan-an;YAN Li-peng(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2022年第2期17-24,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51571084)。
