AlCoCrFeNi high-entropy alloy particle reinforced 5083Al matrix composites with fine grain structure fabricated by submerged friction stir processing

In the present work, 5083Al matrix composites reinforced by 10 vol% AlCoCrFeNi high-entropy alloy (HEA) particles were fabricated by submerged friction stir processing (SFSP). It was found that the fabricated composites consist of equiaxed fine grains with the mean size of 1.2 μm due to dynamic recr...

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Bibliographic Details
Published in:Journal of alloys and compounds 2020-09, Vol.836, p.155411, Article 155411
Main Authors: Yang, Xiao, Dong, Peng, Yan, Zhifeng, Cheng, Buyun, Zhai, Xin, Chen, Hongsheng, Zhang, Hongxia, Wang, Wenxian
Format: Article
Language:English
Subjects:
Aluminum base alloys
Base metal
Composite
Dynamic recrystallization
Friction stir processing
Grain refinement
Grain structure
High entropy alloys
High-entropy alloy reinforcement
Interface
Liquid cooling
Load transfer
Mechanical properties
Nucleation
Particulate composites
Submerged friction stir processing
Ultimate tensile strength
Yield stress
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Summary:In the present work, 5083Al matrix composites reinforced by 10 vol% AlCoCrFeNi high-entropy alloy (HEA) particles were fabricated by submerged friction stir processing (SFSP). It was found that the fabricated composites consist of equiaxed fine grains with the mean size of 1.2 μm due to dynamic recrystallization, particle stimulated nucleation (PSN) and shortened thermal cycle by water cooling. The HEA/5083Al interface showed a two-layer structure, the layer close to the HEA exhibited FCC + T phases with the thickness of approximately100 nm, and the other layer consisted of the Cr-depleted AlCoCrFeNi HEA particles in the size of roughly 100 nm. The SFSPed HEA/5083Al composites showed 25.1% higher yield stress (YS) and 31.9% higher ultimate tensile strength (UTS) in comparison with the base metal while maintaining acceptable ductility (18.9%). Grain refinement, geometrically necessary dislocations and load transfer effect can mainly be responsible for the improved strength. •SFSP were conducted on AlCoCrFeNi high entropy particles reinforced aluminum matrix composites.•CDRX, PSN and shortened thermal cycle by water cooling can be responsible for the grain refinement.•The interface structure was characterized to investigate the interface formation mechanism.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.155411