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Controlling the Mechanical Properties of Bulk Metallic Glasses by Superficial Dealloyed Layer

1
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
2
Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin 300130, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2017, 7(11), 352; https://doi.org/10.3390/nano7110352
Received: 20 September 2017 / Revised: 19 October 2017 / Accepted: 23 October 2017 / Published: 27 October 2017
(This article belongs to the Special Issue Nanoporous Gold and Other Related Materials)
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PDF [7188 KB, uploaded 27 October 2017]
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Abstract

Cu50Zr45Al5 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 Cu50Zr45Al5 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. View Full-Text
Keywords: metallic glasses; dealloying; porous metals; mechanical properties metallic glasses; dealloying; porous metals; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, C.; Li, M.; Zhu, M.; Wang, H.; Qin, C.; Zhao, W.; Wang, Z. Controlling the Mechanical Properties of Bulk Metallic Glasses by Superficial Dealloyed Layer. Nanomaterials 2017, 7, 352.

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