Wang Chaoyang, Li Man, Zhu Mo, Wang Han, Qin Chunling, Zhao Weimin, Wang Zhifeng
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin 300130, China.
Nanomaterials (Basel). 2017 Oct 27;7(11):352. doi: 10.3390/nano7110352.
CuZrAl₅ bulk metallic glass (BMG) presents high fracture strength. For improving its plasticity and controlling its mechanical properties, superficial dealloying of the BMG was performed. A composite structure containing an inner rod-shaped Cu-Zr-Al amorphous core with high strength and an outer dealloyed nanoporous layer with high energy absorption capacity was obtained. The microstructures and mechanical properties of the composites were studied in detail. It was found, for the first time, that the mechanical properties of CuZrAl₅ BMG can be controlled by adjusting the width of the buffer deformation zone in the dealloyed layer, which can be easily manipulated with different dealloying times. As a result, the compressive strength, compressive strain, and energy absorption capacity of the BMGs can be effectively modulated from 0.9 to 1.5 GPa, from 2.9% to 4.7%, and from 29.1 to 40.2 MJ/m³, respectively. The paper may open a door for developing important engineering materials with regulable and comprehensive performances.
CuZrAl₅块体金属玻璃（BMG）具有较高的断裂强度。为了提高其塑性并控制其力学性能，对BMG进行了表面脱合金处理。获得了一种复合结构，其包含具有高强度的内部棒状Cu-Zr-Al非晶态核心和具有高能量吸收能力的外部脱合金纳米多孔层。对复合材料的微观结构和力学性能进行了详细研究。首次发现，通过调整脱合金层中缓冲变形区的宽度，可以控制CuZrAl₅ BMG的力学性能，而脱合金时间不同时，该宽度易于控制。结果，BMG的抗压强度、压缩应变和能量吸收能力可分别从0.9 GPa有效调节至1.5 GPa、从2.9%调节至4.7%、从29.1 MJ/m³调节至40.2 MJ/m³。本文可能为开发具有可调节综合性能的重要工程材料打开一扇门。
