Article Dans Une Revue Metals and Materials International Année : 2025

Multi-Scale Study of the Influence of Bonding Temperature on the Diffusion Bonding of Equiatomic CoCrFeMnNi High Entropy Alloy and 316L Stainless Steel

Résumé

The microstructural evolution and mechanical characteristics of CoCrFeMnNi high entropy alloy (HEA) joined to 316 L stainless steel (SS316L) were investigated by performing diffusion bonding at temperatures ranging from 975 °C to 1050 °C under a compressive pressure of 5 MPa. The diffusion-bonded samples were examined microstructurally with a Scanning Electron Microscope (SEM) equipped with an Energy Dispersive Spectrometer (EDS), Electron Back Scattered Diffraction (EBSD) and X-ray Diffraction (XRD) analyses, and the mechanical responses of the joints were assessed based on the fracture energy calculation from the shear test results. The CoCrFeMnNi-HEA was successfully joined to SS316L preserving a single face centred cubic (FCC) phase solid solution within the diffusion zone. Increasing the bonding temperature led to widening the diffusion zones and microstructural changes such as grain growth, which became more prominent, particularly for temperatures equal to 1025 °C and beyond. The optimum bonding temperature was observed to be 1000 °C, corresponding to a total diffusion width of 10.5 μm. These diffusion joints were characterised by the moderate presence of interfacial pores and the highest fracture energy.

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hal-05441410 , version 1 (05-01-2026)

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Olushola Bamidele Nenuwa, Léo Thiercelin, Laurent Peltier, Eric Fleury, Nathalie Siredey-Schwaller, et al.. Multi-Scale Study of the Influence of Bonding Temperature on the Diffusion Bonding of Equiatomic CoCrFeMnNi High Entropy Alloy and 316L Stainless Steel. Metals and Materials International, 2025, 32, pp.334-352. ⟨10.1007/s12540-025-01987-8⟩. ⟨hal-05441410⟩
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