On Glass Forming Ability of Bulk Metallic Glasses by Relating the Internal Friction Peak Value.

The internal friction (IF) behaviors of a series of LaCe-, Zr-, and La-based bulk metallic glasses (BMGs) were studied by a computer-controlled, conventional inverted torsion pendulum. The results indicate that with an increasing temperature, the IF also increases gradually in the supercooled liquid region, followed by a decrease caused by crystallization. BMGs with a good glass forming ability (GFA) usually possess a high IF peak value for an alloy system with the same constituent elements. Furthermore, the magnitude of the IF value (Q_i⁻¹) of the inflection point is an efficient criterion of GFA. The Q_i⁻¹ value is a valid criterion under the conditions of identical constituent elements and different element contents. However, Q_i⁻¹ and GFA have no relationship among different alloy systems. [ABSTRACT FROM AUTHOR]