Spinodal decomposition existence of the beta Ti-Cr binary alloy: computer simulation of the real alloy system and experimental investigations

摘要

The spinodal decomposition of beta Ti-Cr binary alloys system still questionable, since there are rare experimental data moreover simulation results for the real alloy system have not been found. Transmission electron microscopy (TEM) and quantitative computer simulations results based on Khachaturyan's diffusion equation have been employed to study the microstructure evolution occurring in the beta Ti-Cr alloys. Our study results reveal that the metastable beta undergoes a phase separation reaction through a spinodal decomposition. The coherent two phase fields show extremely fine plate-like precipitates lying parallel to {100} plane. Those precipitates are high elastically-induced from the first step of phase separation.