Chen Tao-Hsing, Tsai Chih-Kai
Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohisung 807, Taiwan.
Materials (Basel). 2015 Apr 16;8(4):1831-1840. doi: 10.3390/ma8041831.
In this study, the high strain rate deformation behavior and the microstructure evolution of Zr-Cu-Al-Ni metallic glasses under various strain rates were investigated. The influence of strain and strain rate on the mechanical properties and fracture behavior, as well as microstructural properties was also investigated. Before mechanical testing, the structure and thermal stability of the Zr-Cu-Al-Ni metallic glasses were studied with X-ray diffraction (XRD) and differential scanning calorimeter. The mechanical property experiments and microstructural observations of Zr-Cu-Al-Ni metallic glasses under different strain rates ranging from 10 to 5.1 × 10³ s and at temperatures of 25 °C were investigated using compressive split-Hopkinson bar (SHPB) and an MTS tester. An transmission electron microscope (TEM) nanoindenter was used to carry out compression tests and investigate the deformation behavior arising at nanopillars of the Zr-based metallic glass. The formation and interaction of shear band during the plastic deformation were investigated. Moreover, it was clearly apparent that the mechanical strength and ductility could be enhanced by impeding the penetration of shear bands with reinforced particles.
在本研究中，研究了Zr-Cu-Al-Ni金属玻璃在不同应变速率下的高应变速率变形行为和微观结构演变。还研究了应变和应变速率对力学性能、断裂行为以及微观结构性能的影响。在力学测试之前，用X射线衍射（XRD）和差示扫描量热仪研究了Zr-Cu-Al-Ni金属玻璃的结构和热稳定性。使用压缩式分离霍普金森杆（SHPB）和MTS试验机，研究了Zr-Cu-Al-Ni金属玻璃在25℃温度下、10至5.1×10³s不同应变速率下的力学性能实验和微观结构观察。使用透射电子显微镜（TEM）纳米压痕仪进行压缩试验，并研究Zr基金属玻璃纳米柱处产生的变形行为。研究了塑性变形过程中剪切带的形成与相互作用。此外，很明显，通过用增强颗粒阻碍剪切带的穿透，可以提高机械强度和延展性。
