球磨法制备Mg-Cu非晶态合金粉末

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)，Mg2Cu(化合物)，Mg85Cu15(共晶点)，Mg22Cu78(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。

On Mg-Cu amorphous alloy powders produced by ball milling

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 MgCu 2, Mg 58 Cu 42 , Mg 2Cu, Mg 85 Cu 15 and Mg 22 Cu 78 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