Fe对Mg-3Al合金碳质孕育晶粒细化的影响  

Effect of Iron on Grain Refinement in Mg-3Al Alloys by Carbon Inoculation

作　　者：王春建[1] 

机构地区：[1]昆明理工大学分析测试研究中心

出　　处：《特种铸造及有色合金》2015年第8期785-788,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金地区基金资助项目(51261011);云南省自然科学基金资助项目(2011FZ045)

摘　　要：在本能晶粒细化基础上,向高纯Mg-3Al合金熔体中添加Fe元素,对粗化后的晶粒进行碳质孕育法晶粒细化处理,研究了合金凝固后的晶粒尺寸变化,并对Fe的影响机理进行分析与讨论。结果表明,随着Fe含量的增加,Mg-3Al合金的凝固晶粒尺寸呈先增大后减小的趋势;此外,Fe含量较低时,碳质孕育法处理能获得明显的晶粒细化效果,但随着Fe含量的增加,碳质孕育法细化效果逐渐衰弱,直至完全消失。分析表明,合金晶粒尺寸的变化与凝固过程中的晶核性质变化相关。Grain size changes of as-cast Mg-3Al alloy were investigated through adding Fe into melts then treated by carbon inoculation based on the native grain refinement,and influencing mechanism of Fe was also analyzed and discussed.The results reveal that the grain size in Mg-3Al alloy is increased firstly and then decreased with the increase of Fe.Grain refining efficiency of carbon inoculation is notable when the Fe content is low,while it is fade with Fe content increase.The influencing mechanisms of Fe element on grain size of Mg-3Al alloy is related with the characteristics of nucleuses in solidification induced by Fe.

关 键 词：镁合金 晶粒细化 异质形核 

分 类 号：TG292[金属学及工艺—铸造]