Abstract
High-entropy alloy, a new generation material, exhibits superior structural properties. For high-temperature applications, where dissimilar materials are in demand, HEAs may be joined with commercially available structural materials to improve their performance-life ratio. In this connection, a dissimilar joint was fabricated by gas tungsten arc welding between Al0.1CoCrFeNi-HEA and Inconel 718. The columnar dendritic grains are growing epitaxially at the Al0.1CoCrFeNi-HEA/weld metal interface, where their compositions are matching. While the composition misfit at the weld metal/Inconel 718 interface, reveals the non-epitaxial mode of solidification. In addition, the fusion zone exhibits the porosity and micro-segregation of NbC and Laves phases. The joint shows a joint efficiency of ~ 88%, where the strength is observed to be 644 MPa with 21% ductility. The results demonstrate the applicability of GTAW in fabricating the dissimilar weld joints between HEA and Inconel 718 for structural applications.Graphic abstract
Highlights
A novel alloy design concept proposed independently by two eminent scientific teams of Yeh and his coworkers [1] and Cantor and coworkers [2] led to the discovery of high-entropy alloys (HEAs)
As observed by Eghlimi et al [31] and Chu et al [32], the weldment in the present work reveals the presence of varying microstructures and micro-textures in the different regions
The Energy-dispersive X-ray spectroscopy (EDS) spot analysis corresponding to the matrix, secondary phase, and precipitates in the weld fusion zone (FZ) and the EDS line analysis across the fusion lines were analyzed, and the results are presented in Fig. 5 and Tables 1 and 2
Summary
A novel alloy design concept proposed independently by two eminent scientific teams of Yeh and his coworkers [1] and Cantor and coworkers [2] led to the discovery of high-entropy alloys (HEAs). HEA is a random substitutional solid solution comprising of multiple principal metallic components [1, 2]. The traditional alloying concept strongly believes in the formation of complex intermetallic compounds during multiple principal alloying. HEAs exhibit simple microstructure/crystal structures [3]. High thermal stability, remarkable wear resistance, and high oxidation resistance over a wide range of temperatures from cryogenic temperature to high temperatures are observed in HEAs [4,5,6]. The sluggish cooperative diffusion of principal alloying elements in HEAs
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