The effect of microstructure length scale on dry sliding wear behaviour of monotectic Al-Bi-Sn alloys

Autor(es)

Costa, Thiago A. ; Dias, Marcelino ; Freitas, Emmanuelle S. ; Casteletti, Luiz C. ; Garcia, Amauri

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 689, p. 767-776, DEC 25 2016.
• Citações Web of Science: 11

Resumo

The addition of third elements to Al-based monotectic alloys can increase the alloy load capacity, and depending on the nature of the third element can also improve the tribological characteristics. In the present investigation 1.0 wt.% Sn is added to Al-Bi alloys of hypomonotectic, monotectic and hypermonotectic compositions, giving rise to microstructures typified by droplets of a self-lubricating mixture of Bi and Sn embedded in the Al-matrix. These alloys were directionally solidified with a view to permitting microstructures with a wide range of interphase spacings to be obtained. Micro-adhesive wear tests were carried out and experimental equations relating the wear volume, V, to the interphase spacing are proposed. A more homogeneous distribution of Bi/Sn droplets in the microstructure is shown to be conducive to lower V. The lowest wear rates and wear volumes are shown to be related to the monotectic composition (Al-3.2 wt.% Bi-1wt.% Sn alloy). The presence of higher fraction of Fe-oxide areas interrupting the Bi/Sn lubricant layer, is shown to induce inferior wear resistance for the hypermonotectic alloy (Al-7.0 wt.% Bi-1wt.% Sn) when compared with that of the monotectic alloy. (C) 2016 Elsevier B. V. All rights reserved. (AU)

• Processo FAPESP: 13/23396-7 - Efeitos de parâmetros da microestrutura de solidificação de ligas multicomponentes à base de alumínio (Al-Mg-Si; Al-Sn-Cu; Al-Zn-Mg) nas resistências à degradação por corrosão e tribocorrosão
• Beneficiário: Amauri Garcia
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/15478-3 - Inter-relação entre Parâmetros Térmicos e Microestruturais da Solidificação e Comportamento Tribocorrosivo de Ligas Al-Zn(Mg) e Zn-Mg
• Beneficiário: Emmanuelle Sá Freitas Feitosa
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50502-5 - Interrelation of thermal and microstructural solidification parameters and corrosion/tribocorrosion behavior of alloys for tribological, biomedical and solder applications
• Beneficiário: Amauri Garcia
• Linha de fomento: Auxílio à Pesquisa - Regular