Frontiers in Materials ( IF 2.6 ) Pub Date : 2020-06-19 , DOI: 10.3389/fmats.2020.00223 Constanze Kalcher , Omar Adjaoud , Karsten Albe
Using molecular dynamics simulations, we compare the creep properties of a homogeneous Cu64Zr36 metallic glass, a nanoglass with the same nominal composition, and a nanoglass-crystal composite, where the amorphous grain boundary phase has been reinforced with the high-temperature stable Cu2Zr Laves phase. While the nanoglass architecture is successful at preventing shear band formation, which typically results in a brittle failure mode at room temperature and conventional loading conditions, we find that the high fraction of glass-glass grain boundary phase therein is not beneficial to its creep properties. This can be amended by reinforcing the glass-glass interphase with a high-temperature stable crystalline substitute.
中文翻译:
分子动力学模拟研究Cu-Zr纳米玻璃的蠕变变形和界面增强纳米玻璃复合材料
使用分子动力学模拟,我们比较了均相的Cu 64 Zr 36金属玻璃,具有相同标称组成的纳米玻璃和纳米玻璃-晶体复合材料的蠕变性能,其中非晶态晶界相已通过高温稳定剂增强。 Cu 2 Zr Laves相。尽管纳米玻璃结构成功地防止了剪切带的形成,而剪切带的形成通常会导致室温和常规载荷条件下的脆性破坏模式,但我们发现其中高比例的玻璃-玻璃晶界相不利于其蠕变性能。这可以通过用高温稳定的结晶替代物增强玻璃-玻璃中间相来修正。