Fe-Mn和Fe-Mn-Si粉末混合物的机械合金化  

MECHANICAL ALLOYING OF Fe Mn AND Fe Mn Si MIXED POWDERS

作　　者：刘会赟[1] 刘涛[2] 赵钟涛[1] 马如璋[1] 

机构地区：[1]北京科技大学材料物理系 [2]中科院高能物理所同步辐射室

出　　处：《功能材料与器件学报》1997年第4期243-248,共6页Journal of Functional Materials and Devices

摘　　要：对Ｆｅ－２４Ｍｎ，Ｆｅ－２４Ｍｎ－６Ｓｉ成分的粉末混合物进行了机械球磨，并对不同时间的球磨样品进行了Ｘ射线衍射（ＸＲＤ）和Ｍｏ¨ｓｂａｕｅｒ谱测量。结果表明，球磨使得Ｆｅ、Ｍｎ、Ｓｉ在原子尺度上发生了混合，形成了顺磁性、面心立方结构的Ｆｅ－２４Ｍｎ或Ｆｅ－２４Ｍｎ－６Ｓｉ纳米晶合金，这是Ｆｅ、Ｍｎ或Ｓｉ原子由颗粒表面到体内扩散的结果。球磨６７ｈ以后结构未发生变化，表明形成的是一种热力学亚稳结构，这个结果与Ｆｅ－Ｍｎ和Ｆｅ－Ｍｎ－Ｓｉ合金在室温下的相图结构明显不同。Recently the solid state amorphization reaction (SSAR) induced by mechanical alloying (MA) or mechanical milling (MM) has been studied intensively because of its great potential for producing amorphous materials or nanostructured materials for technological purpose However, the mechanism related to the process of MM or MA is still ambiguous In the present work we have performed the ball milling of Fe 24Mn and Fe 24Mn 6Si mixed powders By employing the X raydiffraction and Mo ¨ssbauer measurements, the composition evolutionduring milling process has been investigated in details A final product of mestable fcc structured, paramagnetic nanocrystalline alloy Fe Mn or Fe Mn Si is obtained, implying a inter diffusion mechanism of Fe and Mn through the surface of ultrafine powders Compared with the ordinary bulk alloy of Fe Mn Si, the phase stability of the milled alloys is quite different

关 键 词：机械合金化 粉末冶金 铁锰系合金 亚稳材料 

分 类 号：TF12[冶金工程—粉末冶金]