Cellular/dendritic transition, dendritic growth and microhardness in directionally solidified monophasic Sn-2%Sb alloy

Autor(es)

Rocha, O. L. ^{[1, 2]} ; Costa, T. A. ^[1] ; Dias, M. ^[3] ; Garcia, A. ^[3]

Afiliação do(s) autor(es)

^[1] Fed Inst Educ Sci & Technol IFPA, BR-66093020 Belem, Para - Brazil

^[2] Fed Univ Para UFPA, Fac Mech Engn, BR-66075110 Belem, Para - Brazil

^[3] Univ Estadual Campinas, UNICAMP, Dept Mfg & Mat Engn, BR-13083860 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA; v. 28, n. 8, p. 1679-1686, AUG 2018.
• Citações Web of Science: 2

Resumo

Horizontal directional solidification experiments were carried out with a monophasic Sn-2%Sb (mass fraction) alloy to analyze the influence of solidification thermal parameters on the morphology and length scale of the microstructure. Continuous temperature measurements were made during solidification at different positions along the length of the casting and these temperature data were used to determine solidification thermal parameters, including the growth rate (V-L) and the cooling rate (T-R). High cooling rate cells and dendrites are shown to characterize the microstructure in different regions of the casting, with a reverse dendrite-to-cell transition occurring for T-R>5.0 K/s. Cellular (lambda(c)) and primary dendrite arm spacings (lambda(1)) are determined along the length of the directionally-solidified casting. Experimental growth laws relating lambda(c) and lambda(2) to V-L and T-R are proposed, and a comparative analysis with results from a vertical upward directional solidification experiment is carried out. The influence of morphology and length scale of the microstructure on microhardness is also analyzed. (AU)

• Processo FAPESP: 16/18186-1 - Evolução microestrutural e resistências mecânica e ao desgaste de ligas ternárias Al-Bi-Si e Al-Bi-Ni solidificadas unidirecionalmente
• Beneficiário: José Marcelino da Silva Dias Filho
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/15158-0 - Caracterização microestrutural e de propriedades na avaliação de ligas para contato térmico interfacial
• Beneficiário: Amauri Garcia
• Modalidade de apoio: Auxílio à Pesquisa - Regular