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Type: Artigo
Title: The Effect Of Microstructure Length Scale On Dry Sliding Wear Behaviour Of Monotectic Al-bi-sn Alloys
Author: Costa
Thiago A.; Dias
Marcelino; Freitas
Emmanuelle S.; Casteletti
Luiz C.; Garcia
Abstract: 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.
Subject: Monotectic Alloys
Wear Resistance
Editor: Elsevier Science SA
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2016.08.051
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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