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Gas tungsten arc welding of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy
https://orcid.org/0000-0001-6906-1870
The AlCoCrFeNi 2.1 eutectic high entropy alloy is of great interest due to its unique mechanical propertiescombining both high strength and plasticity. Here, gas tungsten arc welding was performed for the firsttime on an as-cast AlCoCrFeNi 2.1 alloy. The microstructural evolution of the welded joints was assessedby combining electron microscopy with electron backscatter diffraction, synchrotron X-ray diffractionanalysis and thermodynamic calculations. Microhardness mapping and tensile testing coupled with dig-ital image correlation were used to investigate the strength distribution across the joint. The base mate-rial, heat affected zone and fusion zone are composed of an FCC + B2 BCC eutectic structure, although therelative volume fractions vary across the joint owing to the weld thermal cycle. The BCC nanoprecipitatesthat existed in the base material started to dissolve into the matrix in the heat affected zone and closer tothe fusion zone boundary. Compared to the as-cast base material, the fusion zone evidenced grain refine-ment owing to the higher cooling rate experienced during solidification. This translates into an increasedhardness in this region. The joints exhibit good strength/ductility balance with failure occurring in thebase material. This work establishes the potential for using arc-based welding for joining eutectic highentropy alloys.
Gas tungsten arc welding of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy
https://orcid.org/0000-0001-6906-1870
The AlCoCrFeNi 2.1 eutectic high entropy alloy is of great interest due to its unique mechanical propertiescombining both high strength and plasticity. Here, gas tungsten arc welding was performed for the firsttime on an as-cast AlCoCrFeNi 2.1 alloy. The microstructural evolution of the welded joints was assessedby combining electron microscopy with electron backscatter diffraction, synchrotron X-ray diffractionanalysis and thermodynamic calculations. Microhardness mapping and tensile testing coupled with dig-ital image correlation were used to investigate the strength distribution across the joint. The base mate-rial, heat affected zone and fusion zone are composed of an FCC + B2 BCC eutectic structure, although therelative volume fractions vary across the joint owing to the weld thermal cycle. The BCC nanoprecipitatesthat existed in the base material started to dissolve into the matrix in the heat affected zone and closer tothe fusion zone boundary. Compared to the as-cast base material, the fusion zone evidenced grain refine-ment owing to the higher cooling rate experienced during solidification. This translates into an increasedhardness in this region. The joints exhibit good strength/ductility balance with failure occurring in thebase material. This work establishes the potential for using arc-based welding for joining eutectic highentropy alloys.
Gas tungsten arc welding of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy
https://orcid.org/0000-0001-6906-1870
The AlCoCrFeNi 2.1 eutectic high entropy alloy is of great interest due to its unique mechanical propertiescombining both high strength and plasticity. Here, gas tungsten arc welding was performed for the firsttime on an as-cast AlCoCrFeNi 2.1 alloy. The microstructural evolution of the welded joints was assessedby combining electron microscopy with electron backscatter diffraction, synchrotron X-ray diffractionanalysis and thermodynamic calculations. Microhardness mapping and tensile testing coupled with dig-ital image correlation were used to investigate the strength distribution across the joint. The base mate-rial, heat affected zone and fusion zone are composed of an FCC + B2 BCC eutectic structure, although therelative volume fractions vary across the joint owing to the weld thermal cycle. The BCC nanoprecipitatesthat existed in the base material started to dissolve into the matrix in the heat affected zone and closer tothe fusion zone boundary. Compared to the as-cast base material, the fusion zone evidenced grain refine-ment owing to the higher cooling rate experienced during solidification. This translates into an increasedhardness in this region. The joints exhibit good strength/ductility balance with failure occurring in thebase material. This work establishes the potential for using arc-based welding for joining eutectic highentropy alloys.
Gas tungsten arc welding of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy
Shen, Jiajia (author) / Agrawal, Priyanka (author) / Rodrigues, Tiago A. (author) / Lopes, Joao (author) / Schell, N. (author) / Zeng, Zhi (author) / Mishra, Rajiv S. (author) / Oliveira, J. P. (author, )
2022-01-01
1-18 pages
Materials and design 223(111176), 1-18 (2022). doi:10.1016/j.matdes.2022.111176
Miscellaneous
Electronic Resource
English
| British Library Online Contents | 2016
The interaction and migration of deformation twin in an eutectic high-entropy alloy AlCoCrFeNi2.1
| British Library Online Contents | 2019
| British Library Online Contents | 2018
| British Library Online Contents | 2016
| British Library Online Contents | 2016