Article ID Journal Published Year Pages File Type
1623764 Journal of Alloys and Compounds 2008 4 Pages PDF
Abstract

A thermodynamic approach to predict bulk glass-forming compositions in binary metallic systems was recently proposed. In this approach, the parameter γ* = ΔHamor/(ΔHinter − ΔHamor) indicates the glass-forming ability (GFA) from the standpoint of the driving force to form different competing phases, and ΔHamor and ΔHinter are the enthalpies for glass and intermetallic formation, respectively. Good glass-forming compositions should have a large negative enthalpy for glass formation and a very small difference for intermetallic formation, thus making the glassy phase easily reachable even under low cooling rates. The γ* parameter showed a good correlation with GFA experimental data in the Ni–Nb binary system. In this work, a simple extension of the γ* parameter is applied in the ternary Al–Ni–Y system. The calculated γ* isocontours in the ternary diagram are compared with experimental results of glass formation in that system. Despite some misfitting, the best glass formers are found quite close to the highest γ* values, leading to the conclusion that this thermodynamic approach can be extended to ternary systems, serving as a useful tool for the development of new glass-forming compositions. Finally the thermodynamic approach is compared with the topological instability criteria used to predict the thermal behavior of glassy Al alloys.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
Authors
, , , , ,