Understanding of the duplex high entropy of FeCoNiCuAl alloys magnetic properties dependence on the CuAl amount and annealing temperature

Autor(es)

Bormio-Nunes, Cristina ; Cardoso, Fabio Martins ; Teixeira, Rodolfo da Silva ; Bastos, Jhonatan Feitoza

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 923, p. 8-pg., 2022-07-27.

Resumo

High entropy alloys (HEA) FeCoNi(CuAl)x=0.8 and FeCoNi(CuAl)x =1.6 were studied in the form of small arc melted samples (x = 0.8) and also in successfully obtained hot forged strips (x = 1.6). High annealing temperature of 1200 degrees C was applied to the alloys. The magnetic properties as saturation magnetization (Ms), magnetostriction, coercive field (Hc) and remanent induction (Br) as well as electrical resistivity were measured and correlated to the alloy's microstructure. The thermomechanical process due to hot rolling as well as the annealing at high temperature kept the FCC phase as the majority phase in the duplex alloy and caused changes in the magnetic properties. The unexpected Ms improvement of the alloy with x = 1.6 compared to the one with x = 0.8 was attributed to the Cu segregation originating Cu rich nanoprecipitates, which in turn cause the increase of magnetic elements in the duplex phases. The FeCoNi(CuAl)x=1.6 strip has Hc = 260 A/m, Br = 0.162 T, an initial susceptibility (chi in) of 240 and a resistivity of 100 mu Omega.cm. The alloy had smaller Hc and higher chi in values compared to other FeCoNi(CuAl)x alloys with 0 <= x <= 1.2.(c) 2022 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 17/26386-3 - Obtenção de Ligas de Alta Entropia a base de Fe, Co e Ni e Estudo das suas Propriedades Magnéticas
• Beneficiário: Cristina Bormio Nunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular