Mechanical Alloying For Fabrication Of Ti-Based Amorphous Alloy Powder

Bulk Ti-based amorphous alloys are extremely extensive used in aerospace materials field because of their light quality and excellent elevated temperature properties such as high strength retention, resistance to creep and oxidation. Limited by critical cooling rate, traditional amorphous material preparation methods can't make breakthrough in shape and size.In order to break the limit of critical cooling rate, Ti-based amorphous alloys was prepared by mechanical alloying, then burn into blocks of amorphous alloys by fast sintering technology. The research group researched powder metallurgy technology, manufactured Ti-based amorphous alloys powder by mechanical alloying. And the article analyzed the influences of mechanical alloying, by changing the parameters of the ball to material ratio, the milling time and the milling velocity. The noncrystallization of the powder was observed by XRD, through comparing milled sample of the different parameters, the alloys powder achieved complete amorphization in milling speed 300 r/min, ball-to-powder ratio 20:1, and milling time 50 hours. The microstructure and shape of the powder was observed and analyzed by SEM, and it had the typical morphology of amorphous powders.Through massive comparison experiment, the results showed that the bigger BPR and higher milling velocity were advantageous in forming amorphous alloys, and the amorphous phase was formed by multilayered films proliferates mutually. Glass transition temperature Tg, crystallization temperature Tx1 and supercooled liquid regionâ–³Tx 119 K of Ti50Fe45Sn5 amorphous were found out by DSC, which showed that the powder possessed a strong glass-forming ability. Ti50Cu45Sn5 powder was milled, insteading Cu element of all of the Fe element in Ti50Fe45Sn5 powder. And the sticky pot phenomenon was not obvious, the sample became basically complete amorphous, after milling to 50 hours.The study results showed that the subject of mechanical alloying fabrication of Ti-based amorphous alloy powder was entirely feasible, and this had laid a solid foundation for the follow-up curing sintering of powder metallurgy.