Mg-Al_4C_3中间合金对AZ31B镁合金组织的细化  

Effect of Mg-Al_4C_3 Master Alloy on the Grain Refinement of AZ31B Magnesium Alloy

作　　者：王慧源[1] 刘生发[2] 韩辉[2] 王小虎[2] 

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070 [2]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《武汉理工大学学报（信息与管理工程版）》2009年第4期610-612,628,共4页Journal of Wuhan University of Technology：Information & Management Engineering

基　　金：基金项目:湖北省科技攻关基金资助项目(2007AA101C37)

摘　　要：采用SEM、EDS和XRD等测试手段研究Mg-50%Al4C3中间合金对AZ31B镁合金显微组织的细化效果。研究结果表明,中间合金的加入可显著细化AZ31B镁合金的枝晶组织和晶粒尺寸。当Al4C3的加入量为0.9%时,α-Mg晶粒的平均尺寸由基体合金的280μm降至约53μm。β相由连续网状转变为不连续的网状和细小弥散的粒状。通过能谱分析及面错配度计算证实,Al4C3可成为初生α-Mg晶粒的良好异质核心。The refining effect of Mg -50% Al4C3（mass fraction） master alloy on microstructure of AZ31B magnesium alloy was studied using SEM, EDS and XRD, and so on. The results show that the grain size of α - Mg in AZ31 B alloy is apparently reduced after adding Mg -Al4C3 master alloy. When the content of Al4C3 is 0.9% ,the average grain size of the α - Mg grain decreases from about 280 μm of AZ31 B based alloy to around 53 μm. Meanwhile, the β phase morphology obviously changes from the continuous netted structure to discontinuous net and granular structure. Based on the analysis of EDS and calculation of the planar disregistry between Al4C3 and Mg,Al4C3 particles can act as the heterogeneous nucleus of primary α -Mg phase.

关 键 词：AZ31B镁合金 Mg-Al4C3中间合金 晶粒细化 

分 类 号：TG146.22[一般工业技术—材料科学与工程]