摘要
通过OM,SEM,TEM,XRD和力学拉伸实验,研究了固溶和时效热处理对Mg-12Gd-3Y-Sm-0.5Zr(质量分数,%)合金组织和力学性能的影响。结果表明,Mg-12Gd-3Y-Sm-0.5Zr合金铸态组织由α-Mg基体和含Mg5Gd相和Mg41Sm5相的粗大枝晶组成,经过固溶和时效处理后,时效析出了Mg24Y5相,Mg5Gd相演变为Mg3Gd相,固溶时效态合金纳米尺寸的长条状相的脱溶析出可有效强化合金。合金在不同状态下的室温抗拉强度为:铸态219.4 MPa、固溶态224.0 MPa和时效态299.8 MPa。
Microstructure and mechanical properties of Mg-12Gd-3Y-Sm-0. 5Zr( mass%) alloy after solid solution and aging treatment were researched by means of optical microscopy( OM),X-ray diffract meter( XRD),scanning electron microscopy( SEM),energy disperse spectroscopy( EDS) and tensile experiment. The results show that the microstructure of as-cast Mg-12Gd-3Y-Sm-0. 5Zr alloy is composed of α-Mg matrix and branches crystal containing Mg5Gd and Mg41Sm5phase. After heat treatment,the Mg24Y5phase is founded and Mg5Gd phase can transform to Mg3Gd phase. The nanoscale stripe phase is precipitated out,and the alloy is strengthened effectively. The tensile strength of the alloy are 219. 4 MPa( as-cast),224. 0 MPa( solid solution state) and 299. 8 MPa( aging state),respectively.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第5期44-48,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51171059)
河南省高校科技创新团队支持计划(2012IRTSTHN008)
河南省基础与前沿技术研究计划(102300410018)
