材料科学
非晶态金属
脆性
复合材料
亚稳态
无定形固体
延展性(地球科学)
微观结构
焦耳加热
极限抗拉强度
打滑(空气动力学)
闪光灯(摄影)
剪切(地质)
热力学
结晶学
光学
合金
化学
蠕动
物理
量子力学
作者
Ilya Okulov,Ivan Soldatov,M. F. Sarmanova,I. Kaban,Thomas Gemming,Kristina Edström,J. Eckert
摘要
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.
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