【摘要】 研究了合金元素Sb对Mg 6Al合金的铸态显微组织及热挤压镁合金焊丝力学性能的影响。研究结果表明 ,Sb对Mg 6Al合金的铸态组织有明显的细化作用 ,细化了α Mg晶粒和Mg17Al12 相 ,Sb与元素Mg形成短棒状的金属间化合物Mg3 Sb2 ,该相在α Mg晶粒内和晶界均有分布。当添加质量分数为 1.0 %的Sb时 ,合金铸态组织的细化效果最为显著。另外 ,添加合金元素Sb ,对提高Mg 6Al合金焊丝的力学性能有显著效果 ,当加入质量分数为 1.0 %的Sb时 ,焊丝的抗拉强度σb 最高 ,为 3 3 4.6MPa ,伸长率δ为 14 .5 4%,与Mg 6Al相比 ,σb与δ分别提高 61%与 3 7%。更多还原

【Abstract】 Effects of Sb on as-cast microstructure of Mg-6Al alloy and mechanical properties of its welding wire in hot extruding were examined. It is found that Sb can obviously refine α-Mg grain and Mg 17Al 12 phase in as-cast microstructure of Mg-6Al alloy. Short rod-like intermetallic compound Mg₃Sb₂ generated as a result of Sb combination with Mg was uniformly distributed in α-Mg grain and grain boundary.1% Sb addition can most remarkably refine as-cast microstructure and significantly improve the ultimate tensile strength σ_b （334.6 MPa） and the elongation δ（14.54%） of Mg-6Al alloy welding wire which was increased by 61% and by 37% respectively compared with conventional Mg-6Al alloy.更多还原