Al、Zn元素对镁合金的晶粒细化机理分析  

Grain Refining Mechanism of Al and Zn Element for Magnesium Alloys

作　　者：王春建[1] 金青林[1] 周荣[1] 蒋业华[1] 

机构地区：[1]昆明理工大学,云南昆明650093

出　　处：《稀有金属材料与工程》2010年第A01期208-211,共4页Rare Metal Materials and Engineering

基　　金：云南省自然科学基金(2007E031M)

摘　　要：从"结晶游离"的角度研究了Al、Zn元素对镁合金晶粒的细化机理,建立了一类可用于评估"游离晶"对合金组织细化能力的数学模型。分析结果表明,Mg-Al合金中的游离晶对合金组织的细化能力高于相同溶质浓度的Mg-Zn合金,并且溶质浓度越高,游离晶的细化能力差别越大,这可能是导致相同浓度的Mg-Al合金晶粒尺寸更加细小的主要原因。Grain refining mechanism of Al and Zn element for magnesium alloys was investigated through analyzing crystal extricating phenomenon, and a new mathematical model, which could be used to evaluate grain refining ability of extricating crystals, was developed Results show that grain refining ability of extricating crystals in Mg-Al alloys was higher than in Mg-Zn alloys with the same solute content; the higher the solute content, the larger the difference of grain refining ability of extricating crystals in the two alloys. It is suggested that the difference of grain refining ability of extricating crystals may be the main reason for smaller grains of Mg-Al alloys than Mg-Zn alloys.

关 键 词：镁合金 晶粒细化 异质形核 粘度 

分 类 号：TG146.22[一般工业技术—材料科学与工程]