摘要
以高锌Mg-14Zn-3Al镁合金为研究对象,利用OM、XRD和SEM等研究了挤压铸造工艺对Mg-14Zn-3Al镁合金的显微组织、铸造缺陷和力学性能的影响。结果表明,挤压铸造Mg-14Zn-3Al合金的显微组织由α-Mg基体、长块状τ-Mg_(32)(Al,Zn)_(49)相、颗粒状或骨骼状的ε-MgZn相组成。随着挤压铸造压力不断增加,合金组织得到细化,第二相的数量增多,显微缩松得到抑制,铸件中的缩松面积从15.67%急剧减少到0.81%。经过挤压铸造处理后,Mg-14Zn-3Al合金的抗拉强度、伸长率分别达到218.1 MPa、5.2%,合金的力学性能得到明显改善。
The influence of squeeze casting on the microstructure,casting defects and mechanical properties of Mg-14Zn-3Al was investigated by OM,XRD and SEM.The results show that the microstructure of as-squeezed Mg-14Zn-3Al alloy is composed ofα-Mg matrix,long blockτ-Mg_(32)(Al,Zn)_(49)phase and granular or skeleton-likeε-MgZn phase.With the increase of the squeeze pressure,the microstructure of the alloy is refined and the quantity of the second phase is increased.Meanwhile,the casting defects in the alloy are inhibited,whose area fraction in the casting is sharply reduced from 15.67%to 0.81%.After squeeze casting treatment,the tensile strength and elongation of Mg-14Zn-3Al alloy can reach 218.1 MPa and 5.2%,respectively,which are much higher than those of gravity casting(192.6 MPa,1.2%).
作者
王杰
周吉学
唐守秋
高恩志
Wang Jie;Zhou Jixue;Tang Shouqiu;Gao Enzhi(School of Materials Science and Engineering,Shenyang Aerospace University;Shandong Provincial Key Laboratory of High Strength Lightweight Metallic Materials,Qilu University of Technology(Shandong Academy of Sciences))
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第10期1062-1066,共5页
Special Casting & Nonferrous Alloys
基金
辽宁省教育厅一般项目资助项目(L2015410,JYT19064)
作者简介
第一作者:王杰,男,1980年出生,讲师,沈阳(110136),电话:18040030237,E-mail:20113227@sau.edu.cn
