机械合金化诱导Fe-Cu系固溶度的扩展  

EXTENSION OF SOLID SOLUBILITY INDUCED BY MECHANICAL ALLOYING IN Fe-Cu SYSTEM

作　　者：黄建宇[1] 吴玉琨[1] 胡魁毅 孟祥敏[1] 

机构地区：[1]中国科学院金属研究所固体原子象开放研究实验室快速凝固非平衡合金实验室

出　　处：《金属学报》1993年第2期B060-B063,共4页Acta Metallurgica Sinica

摘　　要：X射线衍射(XRD)表明室温下几乎不固溶的Fe—Cu系经5h球磨后可形成亚稳过饱和固溶体.对于Fe_(1-x)Cu_x,当0≤x≤0.10时形成单一的bcc相,x≥0.30时形成单一的fcc相,0.10<x<0.3时bcc与fcc相共存。对成分为Fe_(60)Cu_(40)球磨样品进行的差热分析(DTA)表明,γ—Fe(Cu)向α—Fe(Cu)的相转变约在670℃时发生,高分辨电镜(HREM)观察到α与Cu相间有K—S取向关系,表明γ→α的转变为马氏体型相变。At room temperature Fe and Cu form almost no solid solution in equilibrium phase diagram but X-ray diffraction and DTA show that the metastable Fe_(1-x)Cu_x supersaturated solid solution can be obtained after 5 h of ball-milling of the mixed Fe and Cu powders. The bcc phase is extended over the region with x≤0.10, while the fcc phase with x≥0.30. For 0.10<x<0.30, the mixed phase of bcc and fcc may be co-existed. The DTA curve of Fe_(60)Cu_(40) after ball-milling 60 h exhibits that the transformation of γ→ α-Fe(Cu) occurred at about 670℃. The K-S orientation relationship between α-Fe(Cu) and Cu(Fe) has been observed by HREM and proved that the transition of γ→α-Fe(Cu) is martensitic.

关 键 词：机械合金化 过饱和 固溶体 铁铜系 

分 类 号：TG111.5[金属学及工艺—物理冶金]