Abstract The influence of Hf additions on the glass-forming ability (GFA), phase formation and mechanical properties of Cu50HfxZr50-x (x = 2,5,10,20 at.%) alloys has been systematically investigated. We report on a distinct correlation between phase formation and GFA of Cu50Zr50-based alloys. Increasing additions of Hf reduce the thermal stability of the high-temperature B2 Cu(Hf,Zr) phase, while the thermal stability of the corresponding undercooled melt is enhanced. The GFA of these alloy series gradually raises up to 10 at.% Hf, whereas at 20 at.%Hf, the GFA is drastically lowered, since the B2 Cu(Hf,Zr) phase becomes unstable and the precipitation of the low-temperature equilibrium phases is favoured. This interrelation determines the microstructure and results in the formation of Cu-Hf-Zr-based bulk metallic glass composites. These composites not only show appreciable macroscopic plastic strain, but also high yield strength.

中文翻译：

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玻璃化Cu-Hf-Zr合金的玻璃化能力、相形成和力学性能

摘要 系统研究了 Hf 添加量对 Cu50HfxZr50-x (x = 2,5,10,20 at.%) 合金的玻璃形成能力 (GFA)、相形成和机械性能的影响。我们报告了 Cu50Zr50 基合金的相形成和 GFA 之间的明显相关性。增加 Hf 的添加量会降低高温 B2 Cu(Hf,Zr) 相的热稳定性，而相应过冷熔体的热稳定性会增强。这些合金系列的 GFA 逐渐升高到 10 at.% Hf，而在 20 at.%Hf 时，GFA 急剧下降，因为 B2 Cu(Hf,Zr) 相变得不稳定并且低温析出平衡相是有利的。这种相互关系决定了微观结构并导致形成基于 Cu-Hf-Zr 的块状金属玻璃复合材料。