Okulov I V, Soldatov I V, Sarmanova M F, Kaban I, Gemming T, Edström K, Eckert J
IFW Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany.
TU Dresden, Institut für Werkstoffwissenschaft, 01062 Dresden, Germany.
Nat Commun. 2015 Jul 29;6:7932. doi: 10.1038/ncomms8932.
Metallic glasses (MGs) inherit their amorphous structure from the liquid state, which predetermines their ability to withstand high loads approaching the theoretical limit. However, the absence of slip systems makes them very sensitive to the type of loading and extremely brittle in tension. The latter can be improved by precipitation of ductile crystals, which suppress a catastrophic propagation of shear bands in a glassy matrix. Here we report a novel approach to obtain MG-matrix composites with tensile ductility by flash Joule heating applied to Cu47.5Zr47.5Al5 (at.%) metallic glass. This homogeneous, volumetric and controllable rapid heat treatment allows achieving uniformly distributed metastable B2 CuZr crystals in the glassy matrix. It results in a significant tensile strain of 6.8±0.5%. Moreover, optimized adjustment of the heat-treatment conditions enables tuning of microstructure to achieve desired mechanical properties.
金属玻璃（MGs）从液态继承了其非晶态结构，这决定了它们承受接近理论极限的高负荷的能力。然而，由于缺乏滑移系，它们对加载类型非常敏感，并且在拉伸时极其脆。后者可以通过析出韧性晶体来改善，这会抑制剪切带在玻璃基体中的灾难性扩展。在此，我们报道了一种通过对Cu47.5Zr47.5Al5（原子百分比）金属玻璃施加快速焦耳加热来获得具有拉伸延展性的MG基复合材料的新方法。这种均匀、体相且可控的快速热处理能够在玻璃基体中实现均匀分布的亚稳B2 CuZr晶体。这导致了6.8±0.5%的显著拉伸应变。此外，对热处理条件的优化调整能够调节微观结构以实现所需的机械性能。
