Ti-6Al-4V粉末注射成形喂料流变主曲线的生成

Generation of rheological master curve of Ti-6Al-4V feedstocks for injection molding

从流变学基本理论出发,讨论剪切速率、温度与Ti-6Al-4V粉末注射成形喂料的剪切粘度的关系。结果表明：随剪切速率增加,喂料的粘度降低;随温度升高,喂料的粘度下降;且喂料在不同温度下的粘度曲线形状相似,只是位置因温度不同而发生相对位移。在此基础上应用由＂时温等效原理＂发展而来的（η/η0-η0y）主曲线生成方法获得Ti-6Al-4V合金粉末喂料的流动主曲线。借助该主曲线,对于进一步研究金属粉末注射成形（MIM）喂料的其它特性以及生产实践大有益处。

Based on the basic theory of rheology, in the present paper the theological behaviors of Ti-6Al-4V feedstocks was analyzed, and the influence of the shear rate and temperature on shear viscosity was deeply discussed. The experimental results show that： the viscosity of feedstocks reduces with the increasing of the shear rate and temperature. The viscosity curves are similar in shape at different temperatures, but with a different position due to the change of temperature. The master curve （η/η0-η0y） developed from time-temperature superposition is used to obtain a master curve for the Ti-6Al-4V feedstocks. The using of the master curve may be beneficial to further study of the feedstocks of MIM as well as production practice.