摘要
利用XRD、SEM、OM等手段,对不同Ca含量的铸态Mg-5Sn-3Al-2Zn合金的组织、力学性能及断口进行了研究与分析。结果表明,不同Ca含量的Mg-Sn-Al-Zn合金主要由α-Mg、Mg2Sn、CaMgSn、Al2Ca相组成。当Ca含量为1.0%时,合金的室温力学性能最高;当Ca含量达到2.0%时,合金基体中分布有大量粗大针状、棒状的CaMgSn和Al2Ca等相,其力学性能大幅度下降;其断裂机制均为解理和准解理断裂。
The microstructure and fracture of as-cast Mg-5Sn-3Al-2Zn alloy were analyzed by XRD（X-ray diffraction）,SEM（scanning electron microscopy）,OM（optical microscopy）.The results reveal that Mg-5Sn-3Al-2Zn-xCa alloys are composed mainly ofα-Mg,Mg2 Sn,CaMgSn,Al2 Ca phase.With the Ca addition of 1.0%,the ambient mechanical properties of the alloy reach up to the maximum value,while the Ca content of 2.0%,a large thick needle or rod-like CaMgSn or Al2 Ca phase can be observed in the matrix alloy,resulting in the obvious deterioration of the mechanical properties of the alloy.In addition,the fracture mechanism is characterized by cleavage and quasi-cleavage fracture.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2015年第11期1133-1136,共4页
Special Casting & Nonferrous Alloys
基金
乐山科技局资助项目(14GZD044)
