Sb对Mg-4Al-2Si合金显微组织和力学性能的影响  

Effects of Sb on Microstructure and Mechanical Properties of Mg-4Al-2Si Alloy

作　　者：宋佩维[1] 郭学锋[1] 井晓天[1] 葛利玲[1] 

机构地区：[1]西安理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2007年第2期88-91,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金项目(50271054);陕西省自然科学基金项目(2002E110);凝固技术国家重点实验室基金项目(200301)

摘　　要：研究了合金元素Sb对Mg-4Al-2Si合金显微组织和力学性能的影响。结果表明，加入少量的Sb（0．25％～0．75％）能有效细化汉字状Mg2Si相颗粒和α（Mg）基体组织，并在合金中形成Mg1Sb2相，提高合金的力学性能：当Sb含量为0．25％时，Mg2Si颗粒显著细化；当Sb含量为0．75％时，α（Mg）基体组织的细化效果最佳，形成了细小、均匀的α（Mg）等轴晶组织，此时合金的抗拉强度和屈服强度达到最大值；当Sb含量大于0．75％时，Mg2Si相颗粒向晶界大量偏聚并粗化，导致材料力学性能迅速下降。The effects of Sb addition on the microstructure and mechanical properties of Mg-4Al-2Si alloy have been examined. The results show that 0.2%~0.75% Sb addition can obviously refine Chinese script Mg_2Si particles and matrix α-Mg phase, and create Mg_3Sb_2 phase in the alloy, improving the mechanical properties of the alloy, where Mg_2Si particles can be greatly refined with 0.25%Sb addition and fine and homogeneousα-Mg equiaxed grain can be generated with 0.75% Sb addition to obtain maximum tensile strength and yield strength. With Sb addition more than 0.75%, the mechanical properties can be dramatically deteriorated, which is as a result of segregation and coarse of amounts of Mg_2Si particles towards grain boundary.

关 键 词：Mg-4Al-2Si镁合金 SB Mg2Si颗粒 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]