Author(s):
Lopes, J. G. ; Varela, M. ; Shim, S. H. ; Schell, N. ; Maawad, E. ; Hong, S. I. ; Baptista, A. C. ; Oliveira, J. P.
Date: 2024
Persistent ID: http://hdl.handle.net/10362/173210
Origin: Repositório Institucional da UNL
Project/scholarship:
info:eu-repo/grantAgreement/FCT//2020.07350.BD/PT;
info:eu-repo/grantAgreement/FCT/Concurso para Atribuição do Estatuto e Financiamento de Laboratórios Associados (LA)/LA%2FP%2F0037%2F2020/PT;
info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Programático/UIDP%2F50025%2F2020/PT;
info:eu-repo/grantAgreement/FCT/Concurso para Atribuição do Estatuto e Financiamento de Laboratórios Associados (LA)/LA%2FP%2F0037%2F2020/PT;
info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Programático/UIDP%2F50025%2F2020/PT;
info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F50025%2F2020/PT;
info:eu-repo/grantAgreement/EC/H2020/730872/EU;
Subject(s): CoCuFeMnNi; Gas tungsten arc welding; High entropy alloys; Mechanical testing; Synchrotron X-ray diffraction; Thermodynamic calculations; Chemistry(all); Mechanics of Materials; Mechanical Engineering; Metals and Alloys; Materials Chemistry
Description
JGL and MV acknowledge Funda\u00E7\u00E3o para a Ci\u00EAncia e a Tecnologia (FCT - MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI). Publisher Copyright: © 2024 The Authors
With the current advancements in materials science, the development of high entropy alloys (HEAs) is progressively increasing. Hence, research on their processability is essential to make them competitive alternatives to common engineering alloys that are widely used in structural applications. One manufacturing technique commonly employed in this sector is gas tungsten arc welding (GTAW). This technique allows to obtain single monolithic parts from separate components, often at the cost of local microstructural and mechanical properties variation across the joint. As such, GTAW processing is capable of supplying relevant knowledge regarding the feasibility of joining new materials and their potential industry uptake. In this study, we present a comparative analysis on the use of GTAW on two distinct multiphase high entropy alloys: CoCu20FeMnNi and the CoCu30FeMnNi. Firstly, microstructural observations coupled with CalPhaD-based calculations and synchrotron X-ray diffraction analysis, allowed to delve, and compare, the microstructural evolution across both welds. It was possible to observe the dual phase nature of the microstructure throughout the welded joint alongside the nucleation of a B2 BCC phase in the heat affected zone (HAZ) of both HEAs. Considering the mechanical properties of the welded materials, results evidenced a poorer, yet still acceptable mechanical performance. The observed decrease in mechanical strength is attributed to the residual stress conditions and large grain size that developed owing to the process thermal cycle, which contrasted deeply with the microstructure of each base material.
