Abstract Zr65.5-xHfxNb3Cu13Ni11Al7.5 (x = 0.0, 0.5, 1.0, 1.5 and 2.0 at.%) bulk metallic glasses (BMGs) were successfully prepared by copper mold casting. The effects of minor Hf addition on the mechanical properties and fracture mechanisms were investigated. The quasi-static compressive mechanical properties of Zr65.5-xHfxNb3Cu13Ni11Al7.5 alloys were significantly improved by Hf addition. The optimum compressive fracture strength (σf) and fracture strain (ef) are 1516 MPa and 2.6%, respectively, for the Zr64.5Hf1.0Nb3Cu13Ni11Al7.5 alloy. The impact toughness of the Zr64Hf1.5Nb3Cu13Ni11Al7.5 alloy (Ak = 127 kJ/m2) is nearly four times than that of the Zr65.5Nb3Cu13Ni11Al7.5 alloy (Ak = 33 kJ/m2). The increase of the fracture surface area and the ratio of vein-like patterns regions caused by Hf addition play an important role in fracture energy dissipation under dynamic loading. The dependence of mechanical properties on the Hf content is closely related to the variation of free volume in the current alloys. The relationship between the Hf addition and the free volume change is discussed in detail. These results may provide new insights into simultaneously enhancing the plasticity and toughness of BMGs with minor alloying.

中文翻译：

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通过少量的 Hf 添加同时提高 Zr 基块状金属玻璃的强度和韧性

摘要 Zr65.5-xHfxNb3Cu13Ni11Al7.5 (x = 0.0, 0.5, 1.0, 1.5 and 2.0 at.%)块状金属玻璃(BMGs)通过铜模铸造成功制备。研究了少量 Hf 添加对机械性能和断裂机制的影响。添加Hf显着提高了Zr65.5-xHfxNb3Cu13Ni11Al7.5合金的准静态压缩力学性能。Zr64.5Hf1.0Nb3Cu13Ni11Al7.5 合金的最佳压缩断裂强度 (σf) 和断裂应变 (ef) 分别为 1516 MPa 和 2.6%。Zr64Hf1.5Nb3Cu13Ni11Al7.5合金（Ak = 127 kJ/m2）的冲击韧性是Zr65.5Nb3Cu13Ni11Al7.5合金（Ak = 33 kJ/m2）的近四倍。Hf添加引起的断裂表面积的增加和脉状图案区域的比例在动态载荷下的断裂能量耗散中起着重要作用。机械性能对 Hf 含量的依赖性与当前合金中自由体积的变化密切相关。详细讨论了 Hf 添加与自由体积变化之间的关系。这些结果可能为通过少量合金同时提高 BMG 的塑性和韧性提供新的见解。