Abstract
The mechanical alloying (MA) behavior for β type solid solutions in Ti-14 mass%Mo and Ti-20 mass%Mo systems was examined by means of X-ray diffractometry (XD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and chemical analysis. The phase transformation and thermal stability of mechanically alloyed solid solutions were also compared with those of the cold-worked powders of the Ti-Mo ingots prepared by melting.
β phase solid solution was formed by MA and the formation time decreases with increasing Mo content. The further MA causes the appearance of the α phase without the formation of the ω phase. On heating the solid solution at temperatures above 823 K, the β phase was stabilized through the precipitation of the α phase. It was also noticed that a great deal of impurity, Fe was dissolved into the powder from the balls and the vessel during the MA process.
