PREP法制备Ti-60Ta合金粉末及其性能研究

An investigation of Ti-60Ta powders produced by PREP

摘要:

本研究利用等离子旋转电极雾化技术制备出球形Ti-60Ta合金粉末,作者利用SEM、XRD和维氏显微硬度测试仪等分析手段对不同粒径的Ti-60Ta合金粉末表面及内部的显微形貌、相组成、树枝晶间距和维氏显微硬度进行了表征。实验结果表明,本研究制备的Ti-60Ta合金粉末主要以β相为主,细粒径粉末还有少量马氏体α"相和ω相；大颗粒粉末的表面呈近似等轴花瓣状的树枝晶组织,小颗粒粉末表面枝晶组织则明显细化,并观察到细针状马氏体；随着粉末粒度减小,马氏体相增多,维氏显微硬度逐渐增大。

Abstract:

In this study, Ti-60Ta powders were produced by the plasma rotating electrode processing technique. The surface and internal microstructural morphologies, phase compositions, distances between dendrites and micro-hardness have been characterized for powders with different size ranges by SEM、XRD and Vickers micro-hardness methods. Results showed that the prepared Ti-60Ta powders exhibited major β phase and a small amount of martensitic α" and ω phases; the surface of larger particles appears isometric petal-shaped dentritic microstructures, while small particles exhibit refined dendritic microstructures. Particularly, fine acicular martensitic appearance was observed on the smaller particles. As the powder particle size decreases, the martensite phases increase and accordingly Vickers micro-hardness increases.