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| Effects of casting current on structure and properties of a nanostructured Zr�CCu�CFe�CAl bulk metallic glass |
| Si-nan Liu1 .Wei-xiaDong1 . Chen-yu Lu2 . Zhu-wei Lu3 . Jia-cheng Ge1 . Chen-chen Yuan3 . Bao-an Sun1 . Tao Feng1 . Xun-li Wang2 . Si Lan1 |
1 Herbert Gleiter Institute of Nanoscience, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2 Department of Physics, City University of Hong Kong,Hong Kong, China
3 School of Materials Science and Engineering, Southeast University, Nanjing 211189, Jiangsu, China |
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Abstract In this paper, we studied the effects of casting currents on the thermophysical behaviors, atomic and nanoscale structure, and mechanical properties of two Zr-based-bulk metallic glasses, i.e.Zr59Cu33Al8 and Zr59(Cu0.55Fe0.45)33Al8, using differential scanning calorimetry,wide-angle X-ray diffraction, and small-angle X-ray scattering, as well as compression tests. Our results revealed that there is no anomalous structural change for the Zr59Cu33Al8 molten liquid before crystallization during cooling with different casting currents. In contrast, a liquid-state phase separation was suggested to occur in the Zr59(Cu0.55Fe0.45)33Al8 molten liquid prepared using lower casting current before crystallization during cooling. The position shift of the first sharp diffraction peak for the diffraction pattern of Zr59(Cu0.55Fe0.45)33Al8 shows that the density of the molten liquid may decrease upon cooling at different casting currents. The small-angle X-ray scattering results indicate that the heterogeneity of the Zr59(Cu0.55Fe0.45)33Al8 metallic glasses increases with the decreasing of the casting temperature. As a result, the metallic glasses with a liquid-state phase separation possess better mechanical properties, including higher-yielding stress and more significant compressive ductility. The increasing of loosely packed regions formed by liquid-state phase separation and their interactions with the shear bands for the Zr-Cu-Fe-Al BMGs were suggested to be responsible for the enhanced compressive plasticity.Our results may shed light on research and development of nanostructured bulk metallic glasses with tunable structures and plasticity.
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Received: 05 December 2017
Published: 23 October 2018
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2018, Vol. 25 
