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Abstract：
The effects of partially substituting Al for Cu in Zr59.62Cu18.4-xNi12Al6+xNb3Hf0.78Y0.2 (x = 0, 2, 4, 6, 8 at.%) bulk metallic glasses (BMGs) on their glass-forming ability (GFA), quasi-static and dynamic mechanical properties, and energy characteristics were investigated. The results showed that an appropriate substitution of Al for Cu can improve GFA and reach a critical casting size up to 10 mm. Additionally, with Al replacement of Cu, the change in the distribution and content of free volume inside the BMGs was the main reason for the quasi-static compression plasticity. In contrast, the BMGs exhibited no plasticity during dynamic compression and high-speed impact, owing to the short loading time and thermal softening effect. In terms of energy characteristics, all alloys have a high combustion enthalpy. And on the surface of the fragments collected from impact, the active elements Zr, Al, and Nb reacted because of the adiabatic temperature rise. Further, x = 4 at.% Zr-based BMG with its superior overall performance could penetrate a 6 mm Q235 plate at a speed of 1038 m/s, combining excellent mechanical properties and energy characteristics. This study contributes to the development of Zr-based BMGs as novel energetic structural materials.
摘要：
在Zr59.62Cu18.4-xNi12Al6xNb3Hf0.78Y0.2（x=0、2、4、6、8at。%)块状金属玻璃(BMG)的玻璃形成能力(GFA)，准静态和动态力学性能，并对能量特性进行了研究。结果表明，适当的Al代替Cu可以提高GFA，并达到临界铸造尺寸达10mm。此外,用Al代替Cu，BMG内部自由体积分布和含量的变化是准静态压缩塑性的主要原因。相比之下,BMG在动态压缩和高速冲击过程中没有表现出可塑性，由于加载时间短和热软化效果。在能源特性方面,所有的合金都有很高的燃烧焓。在撞击收集的碎片表面，活性元素Zr，Al,Nb由于绝热温度升高而发生反应。Further,x=4at。%Zr基BMG以其优越的综合性能，可以以1038m/s的速度穿透6mm的Q235板，结合优异的机械性能和能量特性。这项研究有助于发展Zr基BMG作为新型含能结构材料。
