Abstract
A Ti40Zr40Ni20 quasicrystal (QCs) rod and ribbons were prepared by conventional casting and rapid solidification. The X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimeter (DSC) techniques were used to investigate the microtissue, phase composition, and solidification features of the samples; the nano-indentation test was carried out at room temperature. The results show that a mixture of the α-Ti(Zr) phase and the icosahedral quasicrystal (I-phase) was formed in the Ti40Zr40Ni20 rod; the microstructure of Ti40Zr40Ni20 ribbons mainly consisted of the I-phase. The solidification mechanism of the I-phase was different in the two alloys. The I-phase in the quasicrystalline rod was formed by packet reaction while in the ribbons it was generated directly from the liquid. At room temperature, both samples had relatively high hardness and elastic modulus; the elastic modulus of the ribbons is 76 GPa, higher than the 45 GPa of the rod. The hardness of the ribbons was more than twice that of the rod.
Funder
Shaanxi Provincial Education Department to Serve the Local Special Plan Project
Subject
General Materials Science,Metals and Alloys
Reference45 articles.
1. The Formation mechanism, Properties and Application potentials of quasicrystalline materials;Dong;Chin. J. Mater. Res.,1994
2. Properties- and applications of quasicrystals and complex metallic alloys
3. Phonons, phasons and atomic dynamics in quasicrystals
4. Research Progress of Quasicrystal Application in catalysis, Reinforced Composites and Hydrogen Storage;Song;Chem. Ind. Prog.,2015