A Hall-Petch study of the high toughness Cr40Co30Ni30 multi-principal element alloy

Autor(es)

Puosso, Fernanda Cunha ; Bertoli, Gustavo ; Coury, Francisco Gil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Research; v. N/A, p. 13-pg., 2022-10-04.

Resumo

Multi-principal element alloys (MPEAs) are an emergent class of metallic materials that displays a huge range of possible properties and applications. CrCoNi MPEAs attract great interest because they show good strength-ductility combinations, especially in Cr-rich non-equiatomic compositions. In this work, the Cr40Co30Ni30 MPEA was produced and characterized at different annealing conditions. This alloy displays a great strength-ductility balance, evidenced by the high uniform deformation (55-70%) and high estimated toughness. It also exhibits high strengthening by grain refining, given by the high Hall-Petch slope (k = 655 MPa/mu m(-0.5)). The grain growth kinetics analysis provides estimates that can aid the design and processing of this alloy for future applications. Deformed samples displayed both TWIP and TRIP effects, once mechanical twins and HCP martensitic phase, arranged in nanometric lamellae, are formed during straining, greatly increasing the number of interfaces in the microstructure and providing good mechanical properties in tension. (AU)

• Processo FAPESP: 21/04302-8 - Mecanismos de refino microestrutural e otimização de propriedades mecânicas em ligas de elemento multiprincipal de alta tenacidade
• Beneficiário: Francisco Gil Coury
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/21133-5 - Propriedades mecânicas da liga multicomponente Cr40Co30Ni30 produzida por conformação mecânica
• Beneficiário: Fernanda Cunha Puosso
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 21/05408-4 - Efeito da adição de C, N e B no equilíbrio de fases e comportamento mecânico da liga de elemento multiprincipal Cr40Co40Ni20
• Beneficiário: Gustavo Bertoli
• Modalidade de apoio: Bolsas no Brasil - Doutorado