热等静压对Mg-14Gd镁合金扩散迁移及微观组织的影响  

Effects of Hot Isostatic Pressing on Diffusion Immigrant and Microstructure of Mg-14Gd Alloy

作　　者：华溪如 江善尧 吴海 陶静雅 李军 李东芳 肖旅[1] Hua Xiru;Jiang Shanyao;Wu Hai;Tao Jingya;Li Jun;Li Dongfang;Xiao Lu(Shanhai Institute of Spaceflight Precision Machinery Research;Hangzhou Aerpspace Electron Technology Co.,Ltd.;Aerospace Haiying Haerbin Ti Industrial Co.,Ltd.)

机构地区：[1]上海航天精密机械研究所 [2]杭州航天电子技术有限公司 [3]航天海鹰哈尔滨钛业有限公司

出　　处：《特种铸造及有色合金》2023年第1期72-76,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(U2037601)。

摘　　要：对稀土Gd含量较高的Mg-Gd合金进行了热等静压(HIP)工艺研究。结果表明,热等静压工艺可明显改善镁合金铸件中的微气孔、缩松等铸造缺陷;铸态Mg-Gd合金晶粒尺寸约为56μm。经过热等静压工艺处理后稀土元素存在聚集现象。扩散偶试验结果表明,Mg/Gd元素形成的扩散层包括Mg_(5)Gd、Mg_(3)Gd、Mg_(2)Gd相,热等静压对Gd在Mg基体中的扩散有抑制作用,阻碍了Mg-Gd合金晶粒长大。Hot isostatic pressing treatment of Mg-Gd alloys with high Gd content was investigated. The results reveal that the hot isostatic pressing has obvious effect on the conventional casting defects such as micropores and shrinkage porosity in the magnesium alloy castings. The grain size of as-cast Mg-Gd alloy reaches about 56 μm, and the rare earth elements are aggregated afte hot isostatic pressing process. Mg_(5)Gd, Mg_(3)Gd, and Mg_(2)Gd phases can be observed in the Mg/Gd diffusion zone as a results of the diffusion couple experiment. Diffusion process of rare earth element Gd in Mg matrix has been suppressed as the result of hot isostatic pressing treatment, which plays a role in inhibiting grain growth of Mg-Gd alloy.

关 键 词：Mg-Gd合金 高温流变测试 热等静压 扩散偶 

分 类 号：TG146.22[一般工业技术—材料科学与工程] O614.339[金属学及工艺—金属材料]