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Journal of Materials Engineering and Performance

Erschienen in:

16.06.2021

Microstructural Evolution and Mechanical Properties of Al_0.5CoCrFeNi High-Entropy Alloy after Cold Rolling and Annealing Treatments

verfasst von: Armin Ghaderi, Hossein Moghanni, Kamran Dehghani

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 10/2021

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Abstract

The present study investigated the microstructure and mechanical properties of as-cast, homogenized, cold-rolled, and annealed Al_0.5CoCrFeNi high-entropy alloy. The microstructure is characterized by optical microscopy, XRD, and scanning electron microscopy (SEM) equipped with energy-dispersive x-ray spectroscopy (EDS). Besides, hardness is acquired by Vickers hardness testing, and tensile testing is performed at room temperature for all samples. Results indicate that the matrix and droplet-shaped phases are present in all states. However, the needle-shaped and wall-shaped phases present after homogenization. In all samples, the matrix consists primarily of Fe, Cr, Co, and Ni, while droplet-shaped phases comprise mainly Al-Ni. Moreover, needle-shaped phases are replete with Cr, Ni, Co, Al, and Fe, whereas wall-shaped phases are rich in Cr, Co, and Fe and depleted in Al-Ni. The hardness of the Al_0.5CoCrFeNi HEA increases after homogenizing and culminates at cold-rolled to 425 H_v due to the emerging of the needle and wall-shaped phases and consequently lattice distortion. The yield strength (YS), the ultimate tensile strength (UTS), and the ductility (ε_f) of the cold-rolled specimen are about 545 MPa, 834 MPa, and 26%, respectively. The noticeable improvement in hardness and strength in cold-rolled condition demonstrates a remarkable work-hardening effect without sacrificing much ductility.

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Titel: Microstructural Evolution and Mechanical Properties of Al0.5CoCrFeNi High-Entropy Alloy after Cold Rolling and Annealing Treatments
verfasst von: Armin Ghaderi
Hossein Moghanni
Kamran Dehghani
Publikationsdatum: 16.06.2021
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 10/2021
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-021-05886-y

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