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HomeKey Engineering MaterialsKey Engineering Materials Vol. 775Characterization of Laser Beam Welded...

Characterization of Laser Beam Welded Al_0.5CoCrFeNi High-Entropy Alloy

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Abstract:

High-entropy alloys (HEA), a new generation alloy system offer superior mechanical properties with solid solution strengthening. Al_xCoCrFeNi-HEA is one such system being received more attention because of its specific yield strength and ductility. In the present work, Al_0.5CoCrFeNi-HEA was prepared by vacuum arc melting. The laser beam welding (LBW) was carried out on 1mm thick forged and homogenized HEA, with a beam power of 1.5 kW and at a traverse speed of 600 mm/min. The microstructural features of different regions of the weld were studied using scanning electron microscopy. The homogenized Al_0.5CoCrFeNi-HEA have shown equiaxed grains of average size 60 μm. The weld metal showed a typical weld fusion zone microstructure with dendritic structure with a reduction in BCC phase due to minimal Al and Ni segregation ratio at interdendrites. Micro-chemical analysis with energy dispersive spectroscopy confirmed that there was no major segregation of elements in the weld fusion zone. The microhardness survey performed across the weld evidenced a reduction in hardness, as a consequence of significant reduction in Al-Ni rich hardening factor.

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Periodical:

Key Engineering Materials (Volume 775)

Pages:

448-453

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.775.448

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Online since:

August 2018

Authors:

R. Sokkalingam, Katakam Sivaprasad*, V. Muthupandi, Muthukannan Duraiselvam

Keywords:

Hardness, High Entropy Alloy, Laser Beam Welding, Scanning Electron Microscopy with Energy Dispersive Spectroscopy

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* - Corresponding Author

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