Effect of boron addition on the solidification sequence and microstructure of AlCoCrFeNi alloys

Autor(es)

Ferrari, V ^[1] ; Wolf, W. ^{[2, 3]} ; Zepon, G. ^[1] ; Coury, F. G. ^[4] ; Kaufman, M. J. ^[4] ; Bolfarini, C. ^[1] ; Kiminami, C. S. ^[1] ; Botta, W. J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Postgrad Program Mat Sci & Engn, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Fed Minas Gerais, Dept Met & Mat Engn, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil

^[4] Colorado Sch Mines, Dept Met & Mat Engn, 1500 Illinois St, Golden, CO 80401 - USA

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 775, p. 1235-1243, FEB 15 2019.
• Citações Web of Science: 2

Resumo

An in-depth analysis of the effect of boron addition on the microstructure of the equiatomic AlCoCrFeNi High Entropy Alloy (HEA) was performed. Alloys with nominal compositions AlCoCrFeNiB0.1 and AlCoCrFeNi were produced and analyzed by multi-scale characterization techniques, including X-ray diffraction, scanning and transmission electron microscopy coupled with TEM-based orientation mapping technique. CALPHAD simulation was carried out to understand the solidification sequence and the phase stability of the studied alloys. The equiatomic AlCoCrFeNi alloy forms a mixture of an Al-Ni rich B2 phase with a Fe-Cr rich body centered cubic (BCC) phase; small face centered cubic (FCC) islands were also observed. The boron addition leads to the formation of needle-like Cr-rich borides with an ortho rhombic structure. Moreover, this addition changes considerably the solidification sequence in later stages of the solidification process, resulting in a more complex microstructure. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/21114-5 - Estudo e caracterização da formação de fase e estabilidade em uma liga de alta entropia AlCoCrFeNiB0.1
• Beneficiário: Vítor Ramos Ferrari
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Iniciação Científica
• Processo FAPESP: 16/12601-7 - Efeito da taxa de resfriamento na microestrutura de ligas de alta entropia do sistema AlxCoFeCrNiBy
• Beneficiário: Vítor Ramos Ferrari
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica