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首页> 外文会议>International Symposium on Metastable and Nano-Materials(ISMANAM-2005); 20050703-07; Paris(FR) >The effects of process control agents on mechanical alloying behavior of a Fe-Zr based alloy
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The effects of process control agents on mechanical alloying behavior of a Fe-Zr based alloy

机译：过程控制剂对Fe-Zr基合金机械合金化行为的影响

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In this work, a Fe-Zr based alloy prepared by MA was investigated. The as-milled powders were characterized using X-ray diffraction, differential scanning calorimetry, induction coupled plasma, chemical analysis and scanning electron microscopy. Analysis shows small contamination (< 1.8 at.%) from the milling tools. In MA process, cold welding between particle and particle, and fracturing of the cold welded particles under high energy collision are involved. The balance between cold welding and fracturing can be controlled by the addition of a surface additive, a process control agent (PCA). Various PCAs such as: methanol, stearic acid, cyclohexane and PBTC were used. The results indicate that the impurities introduced by the PCAs may produce considerable effects on the thermally induced crystallization process as well as on the structural behaviour of the as milled powders, if compared with material synthesized without surfactant. We obtain materials with higher thermal stability and low crystalline size (～6 nm). Nevertheless, in other samples the formation of a carbide and/or oxide phase or a high crystallite size (>60 nm) was found.
机译：在这项工作中，研究了由MA制备的Fe-Zr基合金。使用X射线衍射，差示扫描量热法，感应耦合等离子体，化学分析和扫描电子显微镜对研磨后的粉末进行表征。分析表明，铣削工具产生的污染很小（<1.8 at。％）。在MA工艺中，涉及颗粒与颗粒之间的冷焊以及在高能碰撞下冷焊颗粒的破裂。冷焊和断裂之间的平衡可以通过添加表面添加剂，过程控制剂（PCA）来控制。使用了各种PCA，例如：甲醇，硬脂酸，环己烷和PBTC。结果表明，与不使用表面活性剂合成的材料相比，由PCA引入的杂质可能会对热诱导的结晶过程以及磨粉的结构行为产生重大影响。我们获得的材料具有更高的热稳定性和较低的晶体尺寸（〜6 nm）。然而，在其他样品中，发现形成碳化物和/或氧化物相或高微晶尺寸（> 60 nm）。

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