Abstract The effect of strain rate on the ductility of a La-based bulk metallic glass (BMG) over a wide temperature range, and the correlation between ductility and relaxation processes within this alloy are investigated in the present work. The three point bending test and dynamic mechanical analysis are employed to study these phenomena. It is found that the activation energies of the nearly constant loss (NCL) relaxation and intermediate temperature brittleness are almost identical. This observation reveals that the NCL relaxation, as a locally confined or caged dynamics, contributes as the main source of intermediate temperature brittleness in La-based BMGs.

中文翻译：

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La基块状金属玻璃中温脆性的成因

摘要 本工作研究了应变速率对 La 基块状金属玻璃 (BMG) 在较宽温度范围内的延展性的影响，以及该合金中延展性与弛豫过程之间的相关性。三点弯曲试验和动态力学分析被用来研究这些现象。发现几乎恒定损耗（NCL）弛豫和中温脆性的活化能几乎相同。该观察结果表明，NCL 弛豫作为局部受限或笼状动力学，是 La 基 BMG 中温脆性的主要来源。