Abstract In this work, the deformation behaviours of the Ti33Zr30Cu9Ni5.5Be22.5 bulk metallic glass (BMG) in the supercooled liquid region (SLR) were explored through a series of uniaxial compression experiments with a Gleeble 3500 thermal simulator at different strain rates. Results showed two main deformation modes in the SLR: plastic flow and brittle fracture. With increasing temperature and decreasing strain rate during the plastic flow process, the stress overshoot gradually disappeared, and the steady flow stress decreased. At 648 K, a transition from Newtonian flow to non-Newtonian flow was observed while the strain rate exceeded 1 × 10−3 s−1. The morphologies of the deformed BMG specimens changed with increasing temperature and consequently exhibited three profiles: asymmetric deformation, upright drum shape and uniformly flattened column shape. Studies of fracture behaviours showed that as the temperature increased from 618 K to 638 K, the critical strain rate of the fracture increased from 3 × 10−3 s−1 to 6 × 10−3 s−1. Moreover, the fracture angles increased from 46° to 57° due to the change in cohesive strength according to the Mohr–Coulomb criterion. Unlike the condition at room temperature, unique fracture morphologies, including fishbone-like characteristics and a large area of viscous flow layers, were formed under the high-temperature condition.

中文翻译：

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TiZrCuNiBe块状金属玻璃在过冷液体区的变形行为

摘要 在这项工作中，通过使用 Gleeble 3500 热模拟器在不同应变率下进行的一系列单轴压缩实验，探索了 Ti33Zr30Cu9Ni5.5Be22.5 块状金属玻璃 (BMG) 在过冷液体区 (SLR) 中的变形行为。结果表明 SLR 有两种主要的变形模式：塑性流动和脆性断裂。在塑性流动过程中，随着温度的升高和应变速率的降低，应力超调逐渐消失，稳态流动应力减小。在 648 K 时，观察到从牛顿流向非牛顿流的转变，而应变速率超过 1 × 10-3 s-1。变形 BMG 试样的形貌随着温度的升高而变化，因此表现出三种轮廓：不对称变形、直立的鼓形和均匀压扁的柱形。断裂行为研究表明，随着温度从 618 K 升高到 638 K，断裂的临界应变率从 3 × 10-3 s-1 增加到 6 × 10-3 s-1。此外，根据 Mohr-Coulomb 准则，由于内聚强度的变化，断裂角从 46° 增加到 57°。与常温条件不同，高温条件下形成独特的裂缝形态，包括鱼骨状特征和大面积的粘流层。根据 Mohr-Coulomb 准则，由于内聚强度的变化，断裂角从 46° 增加到 57°。与常温条件不同，高温条件下形成独特的裂缝形态，包括鱼骨状特征和大面积的粘流层。根据 Mohr-Coulomb 准则，由于内聚强度的变化，断裂角从 46° 增加到 57°。与常温条件不同，高温条件下形成独特的裂缝形态，包括鱼骨状特征和大面积的粘流层。