Study of structure and usage of mechanically alloyed nanocrystalline Ti-Cu-Zn powders in powder metallurgy

摘要

Nickel silver alloys are popular for their silver colour and corrosion resistance. These alloys arentraditionally solid solutions of Cu, Ni and Zn. Substitution of Ti, which is a biocompatible metal, fornNi in those alloys, can improve its various utilisations, so the aim of this research work was to studynthe structure and usage of mechanically alloyed nanocrystalline Ti–Cu–Zn powders in powdernmetallurgy. The Ti content in alloyed powder with a silver contrast was also minimised. Thenproducts were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM)nexaminations. Ni in the nickel silver alloys (22%Ni) could be substituted by Ti and the same silverncolour could be obtained with 10%Ti in the alloy. Alloyed powder with a silver contrast andn210 nm grain size could be obtained by the optimisation of milling parameters. After 5 h of thenpowder milling, in addition to Cu–Ti solid solution, TiCu4 was also formed. It was also shown thatnby increasing the milling time amorphous alloys could be obtained. After sintering the powder, innaddition to Cu–Ti solid solution, TiCu4, TiCu3, TiCu2, TiCu could be formed.