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Metals 2017, 7(10), 425; doi:10.3390/met7100425

Formation of Nanoscale Metallic Glassy Particle Reinforced Al-Based Composite Powders by High-Energy Milling

National Engineering Research Center of Near-Net-shape forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China
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Received: 8 September 2017 / Revised: 1 October 2017 / Accepted: 9 October 2017 / Published: 12 October 2017
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Abstract

The initial microstructure and mechanical properties of composite powders have a vital role in determining the microstructure and mechanical properties of the subsequent consolidated bulk composites. In this work, Al-based matrix composite powders with a dense and uniform distribution of metallic glass nanoparticles were obtained by high-energy milling. The results show that high-energy milling is an effective method for varying the microstructure and mechanical properties of the composite powders, thereby offering the ability to control the final microstructure and properties of the bulk composites. It was found that the composite powders show a deformed layer combined with an undeformed core after milling. The reinforcements, metallic glass microparticles, are fractured into dense distributed nanoparticles in the deformed layer, owing to the severe plastic deformation, while in the undeformed core, the metallic glass microparticles are maintained. Therefore, a bimodal structure was obtained, showing a mechanical bimodal structure that has much higher hardness in the outer layer than the center core. The hardness of the composite particles increases significantly with increasing milling time, due to dispersion strengthening and work hardening. View Full-Text
Keywords: aluminium matrix composites; nanoparticles; metallic glasses; ball milling aluminium matrix composites; nanoparticles; metallic glasses; ball milling
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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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Zhang, W.; Hu, Y.; Zhang, G.; Wang, Z. Formation of Nanoscale Metallic Glassy Particle Reinforced Al-Based Composite Powders by High-Energy Milling. Metals 2017, 7, 425.

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