Amorphous phase and compact solid formation of Ti-(37.5-X)at%Si-X at%Fe(X=0-10) powders by mechanical alloying and pulse current sintering

摘要

Ti-(37.5 - X) at%Si-X at%Fe (X = 0-10) powder mixtures have been mechanically alloyed in a planetary ball mill under an argon atmosphere for 180 ks. The milled alloy powders become amorphous and crystallization temperature is 843 K for X = 5, being 90 K higher than that for X = 0. Milled powders have been consolidated using a pulse current sintering process under 1.5 GPa. The porosity of an amorphous compact solid consolidated at 813 K is estimated to be 7.5% for X = 5, being much lower than 24% for X = 0. Fe addition to Ti-37.5 at%Si powder mixtures in mechanical alloying improves the stability of an amorphous phase and forming-ability of compact solid powders.