Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 895, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162712
Keywords
High entropy alloys; Metal matrix composites; Aluminum alloys; Matrix; particle interactions; Composite processing
Categories
Funding
- Ohio State University (Columbus, Ohio, USA)
- United States Department of Energy [DE-EE0008877]
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The study found that adding AlCrTiV HEA particles to molten aluminum can significantly improve the mechanical properties of metal matrix composites, primarily through grain refinement and dispersion strengthening. The interactions between matrix aluminum alloys and the particles are crucial in controlling the final microstructure and properties of the composites.
The feasibility of adding AlCrTiV high entropy alloy (HEA) particles to molten aluminum to make metal matrix composites was studied. Equiatomic AlCrTiV HEA particles, produced by a solid state reduction process, were dispersed into pure aluminum and 7075 alloy (Al-5.8Zn-2.3Mg-1.4Cu, all weight %) melt and by a ultrasonic dispenser. It was found that the AlCrTiV particles reacted with molten aluminum, leading to the formation of Al45(Cr,V)7 and Al3Ti intermetallic phases in the aluminum matrix composites. Although the AlCrTiV HEA particles did not survive in molten aluminum during composite processing, the final composite materials showed significantly improved mechanical properties, due to grain refinement and dispersion strengthening. The research suggests that the interactions between matrix aluminum alloys and the particles are key in controlling the final microstructure and properties of the composites. (c) 2021 Elsevier B.V. All rights reserved.
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