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

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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.