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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination
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Nanocrystalline TiAl powders synthesized by high-energy ball milling: effects of milling parameters on yield and contamination

机译：高能球磨合成纳米TiAl粉末：研磨参数对产率和污染的影响

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摘要

High-energy ball milling was employed to produce nanocrystalline Ti-Al powders. As sticking of the powders can be sufficiently severe to result in a near zero yield, emphasis was placed on varying milling conditions so as to increase the yield, while avoiding contamination of the powders. The effects of milling parameters such as milling tools, initial state of the powders and addition of process control agents (PCA's) were investigated. Cyclohexane, stearic acid and titanium hydride were used as PCA's. Milling was conducted either in a Cr-steel vial with C-steel balls, or in a tungsten carbide (WC) vial with WC balls, using either elemental or pre-alloyed powders. Powder samples were characterized using X-ray diffraction, scanning and transmission electron microscopy. In the absence of PCA's mechanical alloying in a WC vial and attrition milling in a Cr-steel vial were shown to lead to satisfactory yields, about 65-80 percent without inducing any significant contamination of the powders. The results suggest that sticking of the powders on to the milling tools is correlated with the phase evolution occurring in these powders during milling.
机译：采用高能球磨生产纳米晶Ti-Al粉末。由于粉末的粘附可能足够严重以致导致接近零的收率，因此重点放在变化的研磨条件上以增加收率，同时避免粉末的污染。研究了研磨参数（例如研磨工具，粉末的初始状态和添加过程控制剂（PCA））的影响。环己烷，硬脂酸和氢化钛用作PCA。使用元素粉末或预合金粉末在带有C型钢球的Cr钢小瓶中或在带有WC球的碳化钨（WC）小瓶中进行研磨。使用X射线衍射，扫描和透射电子显微镜对粉末样品进行表征。在不存在PCA的情况下，在WC小瓶中进行机械合金化以及在Cr-钢小瓶中进行磨磨可产生令人满意的收率，大约65-80％，而不会引起粉末的任何显着污染。结果表明，粉末在研磨工具上的粘附与这些粉末在研磨过程中发生的相演变有关。

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