强韧化镁合金舱段低温加工工艺以及热处理研究  

Study on cryogenic processing technology and heat treatment of high-strength and high-toughness magnesium alloy cabin sections

作　　者：郑丁夏 赵熹[1] 贺亚云 李树昌 郭睿 Zheng Dingxia;Zhao Xi;He Yayun;Li Shuchang;Guo Rui(School of Aerospace Engineering,North University of China,Shanxi Taiyuan,030051,China;School of Mechanical and Electrical Engineering,North University of China,Shanxi Taiyuan,030051,China)

机构地区：[1]中北大学航空宇航学院,山西太原030051 [2]中北大学机电工程学院,山西太原030051

出　　处：《机械设计与制造工程》2025年第4期49-53,共5页Machine Design and Manufacturing Engineering

基　　金：中北大学2022年科技项目(20221878)。

摘　　要：针对稀土镁合金塑性差的问题,采用低温空心坯料挤压与圆弧母线缩口工艺制备Mg-Gd-Y-Zn-Zr合金筒形舱体构件,通过优化确定热处理工艺最佳参数为380℃×3 h+200℃×98 h,并利用原位拉伸技术揭示其强韧化机制。研究表明:440℃低温成形显著提高了舱段构件的延伸率;经最佳热处理工艺处理后,合金综合力学性能显著提升,实现了强韧性均衡;原位拉伸分析阐明了合金的塑性变形行为,为稀土镁合金工程化应用提供了理论依据与技术支撑。Aiming at the poor plasticity of rare earth magnesium alloy,Mg-Gd-Y-Zn-Zr alloy barrel cabin members are prepared by low temperature hollow billet extrusion and circular busbar shrinking process,the optimum parameters of the heat treatment process are determined to be 380℃×3 h+200℃×98 h,and the strength and toughening mechanism is revealed by in-situ tensile technique.The results demonstrate that low-temperature forming at 440℃significantly enhances the elongation of cabin components.After optimal heat treatment,the alloy exhibits a notable improvement in comprehensive mechanical properties,achieves a balanced strength and toughness.Insitu tensile analysis clarifies the plastic deformation behavior of the alloy,which provides theoretical foundations and technical support for the engineering application of rare-earth magnesium alloys.

关 键 词：稀土镁合金 挤压 缩口 热处理 原位拉伸 

分 类 号：TG146.22[一般工业技术—材料科学与工程]