Journal of Alloys and Compounds | 2019
Amorphization/crystallization behaviors of Ti50Al45Si5 multi-component powder treated by mechanical alloying and subsequent heat treatment
Abstract
Abstract In this study, Ti50Al45Si5 multi-component powders are synthesized to investigate their amorphization or crystallization behaviors by mechanical alloying and subsequent heat treatment. The mechanically alloyed Ti50Al45Si5 multi-component powder was ball-milled with different milling time, and the respective crystallographic properties classified. Under the milling time of 5\u202fh, Ti50Al45Si5 powder remained only as a refined single phase of crystallite, and no mechanical alloy behavior occurred. The phase behavior of the 15\u202fh milling showed crystalline/amorphous mixed phases depending on the continuous mechanical alloying, corresponding to the grain refinement and increase of strain energy. At 25\u202fh milling, the mechanically alloyed powder was completely amorphized. To investigate the crystallization behavior of amorphized Ti50Al45Si5 powder, the subsequent heat treatment was conducted at temperature (500 and 850) °C, at which heat flow change was observed during the DTA/DSC analysis. Additionally, the crystallinity was calculated using the Rietveld refinement method by X-ray diffraction for quantitative analysis of the crystalline phases of Ti50Al45Si5 multi-component powder.