摘要
采用重力铸造法制备Mg-4Al-4Si-0.75Sb(AS44-0.75Sb)(质量分数/%,下同)镁合金,研究铸态合金的显微组织和室温力学性能。结果表明:铸态AS44-0.75Sb合金主要由α-Mg基体、β-Mg17Al12相、Mg2Si相和Mg3Sb2相组成;加入0.75Sb后形成高熔点的Mg3Sb2相,显著改善了Mg2Si相的形貌,使粗大的骨骼状Mg2Si转变为相对细小的汉字状Mg2Si。铸态合金的硬度HV为65.9,屈服强度为136.4MPa,抗拉强度为172.3MPa,伸长率为3.3%;拉伸断裂形式为准解理脆性断裂。
Mg-4Al-4Si-0.75Sb（AS44-0.75Sb）（mass fraction/%） magnesium alloys were prepared by the gravity casting.Microstructure and mechanical properties at room temperature of the as-cast AS44-0.75Sb alloy were investigated.The results show that the as-cast microstructure consists of α-Mg matrix,β-Mg17Al12 phase,Mg2Si phase and Mg3Sb2 phase;the addition Sb of 0.75 results in the formation of Mg3Sb2 phase with high melting-point,the morphology of skeleton-like primary Mg2Si phase can be modified significantly and becomes refinement Chinese script Mg2Si.The hardness HV of alloy is 65.9,yield strength,ultimate tensile strength and extension percentage are about 136.4MPa,172.3MPa and 3.3% respectively.The fracture forms of the alloy is quasi-cleavage brittle fracture.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2012年第4期36-41,共6页
Journal of Materials Engineering
基金
陕西省教育厅自然科学专项科研计划资助项目(2010JK470)
陕西省自然科学基础研究计划资助项目(2010JM6009)
