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首页> 外文期刊>Journal of Materials Science >Microstructural evolution during mechanical milling of Ti/Al powder mixture and production of intermetallic TiAl cathode target
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Microstructural evolution during mechanical milling of Ti/Al powder mixture and production of intermetallic TiAl cathode target

机译：机械研磨Ti / Al粉末混合物和金属间化合物TiAl阴极靶的微观组织演变

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摘要

Titanium aluminides are of great technological interest because of their attractive mechanical properties. Mechanical milling/alloying is a promising powder metallurgical technique, which can achieve ultrafine, uniform and manipulable microstructures. In this study, we employed a recently revisited discus mill to produce a composite Ti-(50-57) at.%Al powder feedstock, which is suitable for hot consolidation to produce bulk cathode targets for physical vapour deposition (PVD) coatings. The effects of milling time, quantity of process control agent (PCA) and discus-to-powder weight ratio (DPR) on the microstructure evolution of the attendant Ti/Al composite powder were investigated in detail. It was found that to produce Ti/Al composite powders with a fine particle size and a uniform microstructure, the practicable processing parameters should be 2 or 3% isopropanol addition as PCA, 12 h of milling time and at least 13:1 DPR weight ratio. Cathode targets were produced by hot isostatic pressing (HIPing) the as-milled powders. The targets were then used to produce a PVD TiAlN coating which had an average microhardness of 2400 HV.
机译：铝化钛因其吸引人的机械性能而备受关注。机械研磨/合金化是一种很有前途的粉末冶金技术，可以实现超细，均匀和可操纵的显微组织。在这项研究中，我们使用了最近重新造访的铁饼磨机来生产复合Ti-（50-57）at。％Al粉末原料，该原料适合热固结以生产用于物理气相沉积（PVD）涂层的整体阴极靶。详细研究了研磨时间，过程控制剂的量（PCA）和铁粉与粉末的重量比（DPR）对伴随的Ti / Al复合粉末组织演变的影响。发现要生产具有精细粒度和均匀微观结构的Ti / Al复合粉末，可行的加工参数应为PCA添加2％或3％异丙醇，12小时的研磨时间和至少13：1的DPR重量比。通过热等静压（HIPing）研磨后的粉末生产阴极靶。然后将靶材用于生产平均显微硬度为2400 HV的PVD TiAlN涂层。

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