Glass-forming ability, phase formation and mechanical properties of glass-forming Cu-Hf-Zr alloys
Glass-forming ability, phase formation and mechanical properties of glass-forming Cu-Hf-Zr alloys
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DOI：
10.1016/j.pnsc.2019.08.009
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发表时间：
2019-10-01
影响因子：
4.7
通讯作者：
Pauly, S.
中科院分区：
文献类型：
--
作者：
Kosiba, K.;Song, Kaikai;Pauly, S.
研究了Hf添加量对Cu50HfxZr50-x （x = 2,5,10,20 at）的非晶形成能力（GFA）、相形成和力学性能的影响。%)合金已被系统地研究过。我们报道了cu50zr50基合金的相形成与GFA之间有明显的相关性。Hf添加量的增加降低了高温B2 Cu（Hf,Zr）相的热稳定性，而相应过冷熔体的热稳定性增强。这些合金系列的GFA逐渐升高到10 at。% Hf，而20at。%Hf时，GFA急剧降低，因为B2 Cu（Hf,Zr）相变得不稳定，有利于低温平衡相的析出。这种相互关系决定了微观结构，并导致cu - hf - zr基大块金属玻璃复合材料的形成。复合材料不仅具有可观的宏观塑性应变，而且具有较高的屈服强度。
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 under-cooled 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.