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Effects of solidification thermal parameters and Bi doping on silicon size, morphology and mechanical properties of Al-15wt.% Si-3.2wt.% Bi and Al-18wt.% Si-3.2wt.% Bi alloys

Texto completo
Dias, Marcelino [1] ; Oliveira, Ricardo [1] ; Kakitani, Rafael [1] ; Cheung, Noe [1] ; Henein, Hani [2] ; Spinelli, Jose Eduardo [3] ; Garcia, Amauri [1]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Campinas UNICAMP, Dept Mfg & Mat Engn, BR-13083860 Campinas, SP - Brazil
[2] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6 - Canada
[3] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Citações Web of Science: 0

The use of bismuth (Bi) in aluminum (Al) industries is recognized as prime importance because of possible recycling as alloying element in special applications such as those enhancing machinability. The effects of Bi interaction on solidification progress as well as on the resulting microstructure of hypereutectic Al-Si alloys, i.e. the morphology and size of Si crystals are rare information. As such, the present research work investigates the characteristic parameters of eutectic and primary Si with addition of Bi for both ternary Al-15 wt.%Si-3.2 wt.%Bi and Al-18 wt.%Si- 3.2 wt.%Bi alloys samples directionally solidified (DS) under various cooling rates. The alloy containing 15 wt.%Si showed that Bi acts in the suppression of the growth of primary Si crystals for samples solidified at cooling rates ranging from 2.0 to 31 K/s. For lower rates, a minor fraction of five-fold branched Si was recognized in transverse specimens. A mixture of globular-fibrous eutectic Si is shown to occur for eutectic cooling rates higher than 5 K/s. The Al-18 wt.%Si- 3.2 wt.%Bi alloy is characterized by a mixed structure of eutectic flaky Si and primary angular Si with intersecting spines at nearly 90 all over the entire range of experimental cooling rates (i.e., from 0.4 to 40 K/s). Despite the intricacy of the formed microstructures, it was possible to establish relationships between tensile properties and eutectic Si spacing in order to compare the properties between the tested alloys. Tensile strength and elongation decrease with increasing alloy Si content. (C) 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (httplicreativecommens.org/licenses/by-ne-nd/4.0/). (AU)

Processo FAPESP: 18/11791-2 - 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
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
Processo FAPESP: 17/12741-6 - Aplicação de técnicas experimentais de solidificação, caracterização microestrutural e de propriedades na avaliação de ligas eutéticas e hipereutéticas à base de Al e Zn
Beneficiário:José Eduardo Spinelli
Linha de fomento: Auxílio à Pesquisa - Regular