CoCrFeMnNi基高熵合金-金属间化合物叠层复合材料的微观组织演化及力学性能

doi:10.11896/cldb.25050131

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Abstract A novel high entropy alloy-intermetallic multilayer composite material was fabricated through in-situ reactive diffusion between a high-entropy alloy and pure aluminum. The results indicated that the interface of the composite consists of multi-principal element compound layers, namely the Tentacle area, L1, L2, L3, and L4 layers, with applied pressure and holding time showing positive correlations with mechanical performance. The main phase compositions of the tentacle region, L1, L2, L3 and L4 layers are AlMn(Fe, Co, Ni)₂, Al₅(Co, Cr, Fe, Mn, Ni)₂, Al₃(Co, Cr, Fe, Mn, Ni), Al₆₀Mn₁₁(Fe, Co, Ni)₄, Al₆₀Mn₁₁(Fe, Co, Ni)₄, Al₁₆(Cr, Mn)₄and Al₉Co₂ mixed-phase structure(respectively). In terms of growth mechanisms, the tentacle region is dominated by interfacial reactions; the L2 layer transitions from intragranular diffusion to grain boun-dary diffusion as pressure decreases; the L3 layer primarily involves grain boundary diffusion; the L4 layer does not form a continuous layer. Optimal mechanical properties were achieved under fabricating conditions of 640 ℃ with a 10 h holding time and 30 MPa pressure, yielding a maximum bending fracture load of 2 405.48 N. Microhardness analysis showed minimal variation in the high-entropy alloy layer across different fabricating conditions. The L1 layer exhibited hardness values ranging from 322HV to 513HV. The hardness of the composites fabricated at a temperature of 640 ℃, a holding time of 14 h and a pressure of 30 MPa reached a maximum (reach 513HV). The L2 layer displayed hardness between 549HV and 856HV, The hardness of the composites fabricated at a temperature of 640 ℃, a holding time of 14 h and a pressure of 30 MPa reached a maximum (reach 856HV). The L3 layer demonstrated hardness levels of 654HV—778HV, the hardness of the composites fabricated at a temperature of 640 ℃, a holding time of 10 h and a pressure of 20 MPa reached a maximum (reach 778HV). These findings highlight the significant influence of research on laminated composites and mechanical performance in high-entropy alloy-based multilayer systems. The growth mechanisms and performance optimization mechanisms of the composite material exhibit characteristics typical of intermetallic compounds. This research provides new ideas for the development of composite materials.

Key words： high entropy alloy microstructure laminated composite material mechanical property intermetallic

Published: 10 July 2026 Online: 2026-07-24

CLC number:

TB331

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	YANG Yufeng
	TAN Kaishuo
	YANG Ke
	MAO Lingbo
	DONG Yong

Cite this article:

YANG Yufeng,TAN Kaishuo,YANG Ke, et al. Microstructural Evolution and Mechanical Properties of CoCrFeMnNi-based High Entropy Alloy-Intermetallic Laminated Composites[J]. Materials Reports, 2026, 40(13): 25050131-10.

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https://www.mater-rep.com/EN/10.11896/cldb.25050131 OR https://www.mater-rep.com/EN/Y2026/V40/I13/25050131

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