Cryogenic thermal cycling as a new method of production of ductile metallic glass/crystal composites

本文研究了低温热循环对金属玻璃(Zr60Cu20(Fe或Co或Ni)10Al10)和金属玻璃/晶体复合材料(Zr62Cu17Fe8.5Al6.5W6)的影响。结果表明，与金属玻璃的均匀性预期的零效应相反，热循环导致了结构的再生。这种处理使金属玻璃能够达到较低的松弛状态和较高的能量。然而，据透露，这样的治疗并不会产生普遍的结果。在某些情况下，金属玻璃表现出压缩塑性的改善(Fe10)或保持不变(Ni10)甚至恶化(CO10)。这表明化学键在金属玻璃的塑性响应中起着重要的作用。深冷处理使复合材料的最大塑性应变提高了2%，但随着循环次数的增加，最大塑性应变开始下降。

In the present work the effect of cryogenic thermal cycling on metallic glasses (Zr60Cu20(Fe or Co or Ni)10Al10) and metallic glass/crystal composites (Zr62Cu17Fe8.5Al6.5W6) was explored. It was shown that, contrary to the null effect expected from uniformity in metallic glasses, thermal cycling induces structural rejuvenation. This treatment enables metallic glasses to reach less relaxed states of higher energy. However, it was revealed that such a treatment does not lead to universal results. In some cases metallic glasses exhibit improvement of compression plasticity (Fe10) or no change (Ni10) or even its deterioration (Co10). It appears that chemical bonding plays a significant role in plastic response of metallic glasses. Cryothermal treatment results in improvement of maximal plastic strain of the composite by 2% though it starts to decrease with the increase of the number of cycles.