Mg_(70)Al_(20)Ca_(10)合金机械合金化过程中的结构变化  

Structure change of Mg_(70)Al_(20)Ca_(10) alloy during mechanical alloying process

作　　者：华旻[1] 马立群[1] 刘真云[1] 丁毅[1] 

机构地区：[1]南京工业大学材料学院,江苏南京210009

出　　处：《轻合金加工技术》2007年第5期44-47,55,共5页Light Alloy Fabrication Technology

基　　金：中国人民解放军武器装备重点基金项目(6140502);南京工业大学引进人才科研启动基金项目(51303027)

摘　　要：以纯金属Mg、Al和Ca为原料,采用机械合金化的方法制备了Mg70Al20Ca10非晶态合金,分析了球磨过程中粉末试样的晶粒尺寸变化和相结构变化情况。结果表明,球磨过程中形成纳米晶和两种非晶相。Mg-Al-Ca合金在化学驱动力较小的条件下,可以通过机械驱动力的作用提高Ca、Al在Mg中的固溶度,导致非晶转变的发生。Mg70Al20Ca10amorphous alloy was prepared from pure magnesium, aluminum and calcium powders by mechanical alloying. Grain size ane structure of the as-milled powder samples were also investigated. The results show nanocrystalline and two kinds of amorphous phases form during the ball milling process.The formation of the amorphous phases in the Mg-Al-Ca system can be realized by expansion the solubility limit of Ca and Al in Mg via the mechanical driving force, even when the chemical driving force is very small.

关 键 词：机械合金化 Mg-Al-Ca合金 非晶态 纳米晶 

分 类 号：TG113.1[金属学及工艺—物理冶金]