金属-铸型界面反应法制备镁合金合金化表层的热力学分析及试验研究  

Thermodynamic analysis and experimental study of alloying surface on magnesium alloy prepared by mold interfacial reaction

作　　者：张云[1] 谢卫东[1,2] 魏国兵[1,2] 胡发平[1] 黄耀辉[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]国家镁合金材料工程技术研究中心,重庆400030

出　　处：《兵器材料科学与工程》2017年第3期98-101,共4页Ordnance Material Science and Engineering

基　　金：重庆市科技计划项目应用开发计划重大项目(cstc2015yykf C50001);中国国家大学生创新计划(201610611041)

摘　　要：提出镁合金凝固过程中与预置在铸型表面的合金元素前躯体反应,制备镁合金合金化表层的新思路。以ZnS为前躯体计算分析其热力学可行性,并进行相关试验研究。结果表明:Mg与ZnS反应生成Zn和Mg S,在693~1 000 K具有热力学可行性;液态Mg在表面预置ZnS的铸型中凝固后,Mg表面Zn的质量分数为10.0%,Zn的质量分数由表及里逐步降低,表面以下距离超过35μm后,Zn的质量分数近乎为0。The reactions between magnesium and precursor of alloying elements preseted on the mold surface were applied to prepare alloying surface on magnesium alloy during solidification. ZnS was selected as the precursor and the thermodynamic feasibility was demonstrated. The surface reaction between the precursor ZnS and Mg was studied with experiment. The results show that it is feasible to generate Zn and MgS by the reaction of Mg and ZnS at the temperature range of 693-1 000 K. After the solidification of liquid Mg in the preseted ZnS mold, the mass fraction of Zn on Mg surface is 10.0%. From the surface to the centre, the mass fraction of Zn decreases gradually. When the depth from surface exceeds 35 μm, the mass fraction of Zn is close to zero.

关 键 词：合金化表层 前驱体 热力学 

分 类 号：TG174.445[金属学及工艺—金属表面处理]