【摘要】 基于ZBYT500多功能液态成型装备，采用间接挤压铸造工艺制备了ZM5镁合金隔板件，重点探究了铸态及热处理态下铸件的微观组织与力学性能演变。同时，对挤压铸造过程中产生的宏观偏析缺陷进行了系统表征与分析，研究了其形成机理、偏析区组织性能特征及其影响机制，并提出了相应的减控措施。结果表明，铸态试样的抗拉强度和伸长率分别为181.57 MPa和6.5%，经热处理后分别提升至287.9 MPa和10.8%。隔板件内偏析主要集中于壁厚突变区域。偏析的根本原因是Al元素的大量富集，而T6热处理工艺通过促进元素扩散，可有效减轻材料的偏析现象。更多还原

【Abstract】 ZM5 magnesium alloy spacer parts was facilitated using indirect squeeze casting process by ZBYT500 multifunctional liquid molding equipment, focusing on the microstructure evolution and mechanical properties of as-cast and heat-treated castings. Additionally, the macroscopic segregation defects formed during squeeze casting process were systematically characterized and analyzed. The formation mechanisms, structure and performance characteristics and influence mechanisms were investigaterd, and corresponding reduction and control measures were proposed. The results indicate that the tensile strength and elongation of as-cast specimens reach up to 181.57 MPa and 6.5%, which is significantly increased to 287.9 MPa and 10.8%, respectively, after heat treatment. The segregation in the spacer is predominantly concentrated in areas with thick-walled variations, which is attributed to the substantial enrichment of Al element. Moreover, T6 heat treatment process effectively relieve the segregation phenomenon by promoting elemental diffusion.更多还原