An empirical criterion for predicting the glass-forming ability of amorphous alloys based on electrical transport properties

Based on the Anderson's theory and Mott-CFO model for the electrical transport properties of disordered materials, an empirical criterion has been proposed for predicting the glass,forming ability (GFA) of amorphous alloys, which is termed as the relative electrical resistivity difference between the amorphous and fully crystallized states at room temperature (RT), i.e., Delta rho = (rho(RT)(amor) - rho(RT)(crys))/rho(RT)(crys), rho(RT)(amor) and rho(RT)(crys) denote the room-temperature electrical resistivities of an amorphous alloy and its corresponding crystal, respectively. A higher Delta rho value of an alloy always correlates with a better GFA, which has been unambiguously confirmed by a large number of results in the Cu-Zr-Al-Ag, La-Ce-Al-Co, and Fe-Mo-Y-B alloy systems. Compared with the widely used criteria the reduced glass transition temperature T-rg, the supercooled liquid range Delta T-x, and the parameter gamma, in which the glass transition temperature T-g is necessary and its determination is sometimes arbitrary with inaccuracy for some amorphous alloys, Delta rho can be quite easily and more exactly obtained, and is more consistent with the GFA. The empirical criterion is very useful especially for optimizing the compositions and pinpointing the best glass former with less cost in a given system. (C) 2015 Elsevier B.V. All rights reserved.