A study of the glass-forming range in the ternary Ti---Ni---Al system by mechanical alloying

Abstract

The glass-forming range (GFR) in ternary Ti---Ni---Al alloys was determined via mechanical alloying using a high energy Spex mill. The GFR was also calculated using Miedema's model. Although the theoretical GFR is quite large, the experiments showed a very limited GFR. The concentration ranges chosen were Ti₅₀Ni_xAl_50-x (X=10, 25, 40), Ti₆₀Ni_yAl_40-y (y=10, 20, 30), Ti₇₀Ni₁₅Al₁₅, Ni₂TiAl and TiNiAl. Prolonged milling of the amorphous Ti₅₀Ni₂₅Al₂₅ powders led to the reappearance of the crystalline peaks. Calorimetric experiments showed an endothermic peak near 600 K in most of the samples.