Experimental and Numerical Study of Formation Mechanism of Dual-Phase (AlCoCrFeNi)_X HEAs Brazed Joints by Reactive Ni/Al Nano-Multilayers

Abstract

The FCC + BCC dual-phase solid solution structure was obtained in the Al_0.1CoCrFeNi/304SS brazed joints using Ni/Al reactive multilayer nano-foils, which was proved by combining experiments with simulation. In this study, Finite Element Analysis was achieved to analyze the diffusion behavior across brazing joints, which were subsequently interrelated with the formation mechanism of the brazed micro-structures during the brazing process. During brazing, the joint interface is tightly bonded, and the atoms are diffused sufficiently to form the solid solution zone. The representative microstructure of the joint mainly comprised hard BCC (Al-Ni) + ductile FCC (Co-Fe-Cr) dual-phase. The successful use of nano-multilayer foils as a HEAs filler design can broaden the application range of HEAs and provide a novel procedure for brazing 304SS and Al_0.1CoCrFeNi HEAs, and developing a novel field in the manufacture of HEAs-related joints.

Keywords

High entropy alloys / Self-propagating brazed / Finite element analysis / Diffusion behavior / Formation mechanism

Author Contributions

B.W.: Validation, Visualization, Writing—Original Draft, and Writing—Review & Editing; C.S.: Supervision, Project Administration, and Writing—Review & Editing; W.Y.: Funding Acquisition, Project Administration and Writing—Review & Editing; M.W.: Validation, and Visualization; F.L.: Validation, and Writing—Review & Editing.

Ethics Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

All data included in this study are available upon request by contact with the corresponding author.

Funding

6Declaration of Interest Statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Declaration of Interest Statement

This work was financially supported by the National Natural Science Foundation of China (Grant No. 5226010024).

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