| Summary: | 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 (<i>Q<sub>i</sub></i><sup>−1</sup>) of the inflection point is an efficient criterion of GFA. The <i>Q<sub>i</sub></i><sup>−1</sup> value is a valid criterion under the conditions of identical constituent elements and different element contents. However, <i>Q<sub>i</sub></i><sup>−1</sup> and GFA have no relationship among different alloy systems.
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