A study on preparation and mechanism of Ni based ternary alloy

Abstract

In this paper, the preparation of Ni–Ti–Nb amorphous alloy materials made by mechanical alloying method has been studied. The Ni–Ti–Nb mixed powders obtained by different mechanical alloying times have been analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the Ni–Ti–Nb mixed powders can be mechanically alloyed after milling for 10 hours, and retained with ball milling. Continuously, Ni, Ti and Nb alloy powders diffuse with each other. When the diffusion rate increases to a certain extent, it is too late to form an ordered structure and form a Ni–Ti–Nb amorphous alloy. The stress and displacement curves are obtained by testing the tensile strength at room temperature. The stress changes of the restrained curves are relatively stable when the displacement is 6–18 mm, and the stress changes of the unconstrained curves show a distinct upward trend when the displacement is 6–18 mm, indicating that the strength of the specimens treated with restraint is higher than that of the specimens treated with restraint. This is due to the high internal stress of the material caused by the restraint and the decrease in the tensile strength of the alloy material.