Abstract
The time scale of the amorphization reaction in HfPd system prepared by mechanical alloying (MA) technique was investigated. X-ray diffraction and differential scanning calorimetry (DSC) were used to study the structural transformations and stability of this system. A direct transformation from crystalline to amorphous phase was observed. The intensity of the crystalline peaks of both the hexagonal Hf and cubic Pd phases decayed exponentially as a function of the milling time. The time constants of the decaying process were obtained. On an atomic scale, the radial distribution function RDF(r) and the thermal behavior of the MA Hf63Pd37 (milled for 6 h) showed that it is of a single amorphous phase.