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

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 gl...

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Bibliographic Details
Published in:Metals (Basel ) 2017-10, Vol.7 (10), p.425
Main Authors: Zhang, Weiwen, Hu, Yuan, Zhang, Guanqun, Wang, Zhi
Format: Article
Language:English
Subjects:
aluminium matrix composites
Aluminum
Amorphous materials
ball milling
Bulk density
Consolidation
Dispersion hardening
Dispersion strengthening
Mechanical alloying
Mechanical properties
Metallic glasses
Microparticles
Microstructure
Nanoparticles
Particulate composites
Plastic deformation
Stability
Work hardening
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met7100425