摘要
采用光学显微镜、扫描电镜、X射线衍射仪和能谱仪对时效态Mg-12Gd-3Y-1Sm-xAl合金(x=0,0.4,0.6,1.2)的显微组织和拉伸断口形貌进行观察,运用电子拉伸实验机对合金力学性能进行测试。结果表明:时效态Mg-12Gd-3Y-1Sm合金组织由α-Mg,Mg_(5)Gd,Mg_(24)Y_(5),Mg_(41)Sm_(5)组成,添加Al元素后,在合金中形成Al_(2)RE相。合金晶粒大小随着Al含量的增加呈现先减小后增大的趋势。在同一拉伸温度下,合金的抗拉强度随着Al含量的增加呈现先上升后下降的趋势,当Al含量为0.6%时,合金力学性能最好;对于同一合金,抗拉强度随着拉伸温度的上升呈现出增高的趋势,合金表现出了反常温度效应。时效态Mg-12Gd-3Y-1Sm-0.6Al合金的拉伸断口形貌主要由撕裂棱和解理面组成,断裂方式主要为脆性断裂。
In this experiment,the optical microscope,the scanning electron microscope and the X-ray diffractometer were used to observe the microstructure and tensile fracture morphology of the aged Mg-12Gd-3Y-1SmxAl(x=0,0.4,0.6,1.2)alloy.Tensile testing machine was used to test the mechanical properties of the alloy.The results show that the structure of the aged Mg-12Gd-3Y-1Sm alloy isα-Mg,Mg_(5)Gd,Mg_(24)Y_(5),Mg_(41)Sm_(5).After Al is added to the alloy,it will form Al_(2)RE phase with RE in the alloy.The grain size of the alloy increases first and then decreases with the increase of Al content.At the same tensile temperature,the tensile strength of the aged Mg-12Gd-3Y-1Sm-xAl alloy increases first and then decreases with the increase of Al content.When the Al content is 0.6%,the mechanical properties of the alloy are the best;for the same alloy,the tensile strength tends to increase with the increase of stretching temperature,and the alloy exhibits an abnormal temperature effect.The tensile fracture morphology of the aged Mg-12Gd-3Y-1Sm-0.6Al alloy is mainly composed of tearing edges and cleavage surfaces,and the fracture mode is mainly brittle fracture.
作者
陈籽佚
李全安
陈晓亚
朱宏喜
鲍键
张迁
Chen Ziyi;Li Quanan;Chen Xiaoya;Zhu Hongxi;Bao Jian;Zhang Qian(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-fer-rous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2022年第1期128-134,I0004,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51571084)资助。
