The effect of microstructure length scale on dry sliding wear behaviour of monotectic Al-Bi-Sn alloys
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the financial support provided by FAPESP – São Paulo Research Foundation, Brazil (grants 2013/15478-3; 2013/25452; 2013/23396-7; 2014/50502-5), CAPES and CNPq (The Brazilian Research Council)
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...
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
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2013/15478-3; 2013/25452; 2013/23396-7; 2014/50502-5
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
Fechado
The effect of microstructure length scale on dry sliding wear behaviour of monotectic Al-Bi-Sn alloys
The effect of microstructure length scale on dry sliding wear behaviour of monotectic Al-Bi-Sn alloys
Fontes
Journal of alloys and compounds. An interdisciplinary journal of materials science and solid-state chemistry and physics Vol. 689 (Dec., 2016), p. 767-776 |