球磨法制备Mg-Cu非晶态合金粉末  

On Mg-Cu amorphous alloy powders produced by ball milling

作　　者：王晓军[1] 王晓丽[1] 陈学定[1] 夏天东[1] 

机构地区：[1]兰州理工大学甘肃省省部共建有色金属新材料国家重点实验室,兰州730050

出　　处：《粉末冶金技术》2005年第1期36-39,共4页Powder Metallurgy Technology

基　　金：甘肃省自然科学基金资助项目 (ZS0 32 -B2 5 - 0 18)

摘　　要：本文研究了Mg Cu二元相图的三个共晶点成分配方和两个化合物成分配方在球磨条件下非晶态合金的形成能力。XRD结果显示 :除一个共晶点成分配方外 ,其它所有成分配方都能形成非晶态合金 ;非晶形成能力由大到小依次为MgCu2 (化合物 ) ,Mg58Cu42 (共晶点 ) ,Mg2 Cu(化合物 ) ,Mg85Cu15(共晶点 ) ,Mg2 2 Cu78(共晶点 )。显然 ,作为选择非晶态合金成分的判据来说 ,Schwarz与Johnson的两个条件准则比Davies的共晶线准则更加合适。非晶形成的过程是 :首先发生Mg在Cu中的固溶 ,随后形成过饱和固溶体 ,最后过饱和固溶体失稳形成非晶态合金。The glass forming ability of five alloys with three eutectic compositions and two compound compositions based on the Mg-Cu phase diagram was studied under mechanical alloying conditions. X-ray diffraction results show that all the alloys formed amorphous alloys except for one with eutectic composition. The descending order of the glass forming ability for five alloys is MgCu2, Mg58Cu42, Mg2Cu, Mg85Cu15 and Mg22Cu78. As a composition criterion of amorphous alloy, Schwarz and Johnson's theory is more suitable than Davies' theory. During mechanical alloying, firstly, solid solution is achieved by diffusion of Mg atoms into Cu crystal lattice and then becomes supersaturated solid solution. At last high-energy supersaturation solid solution collapses and amorphous alloy is formed.

关 键 词：非晶态合金 固溶体 非晶形成能力 共晶 球磨法 XRD 相图 成分配方 过饱和 制备 

分 类 号：TF123[冶金工程—粉末冶金] TG139[冶金工程—冶金物理化学]