Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 695, Issue -, Pages 3621-3631Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.11.399
Keywords
Al-Sn alloys; Directional solidification; Microstructure; Tensile properties; Wear
Categories
Funding
- FAPESP-Sao Paulo Research Foundation, Brazil [2012/16328-2, 2013/15478-3, 2013/23396-7, 2014/50502-5]
- CNPq - The Brazilian Research Council
- CSIC-Spanish National Research Council [i-link0944]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [12/16328-2] Funding Source: FAPESP
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The development of alloys suitable for engine bearings demands not only reducing the amount of wear as well as increasing the load carrying capability due to both engines stop/start systems and sudden rise in load or velocity. Al-Sn based alloys are well-known for having excellent tribological and mechanical properties fulfilling these requirements: Sn is a self-lubricating component and addition of third elements should increase the strength of the Al-rich matrix. The current study focuses on interrelations of microstructure of directionally solidified Al-Sn(Cu; Si) alloys and mechanical/tribological properties. In order to analyze the influence of alloy Sn content on the tribological behavior of these ternary alloys, ball-on-disc wear tests were performed under dry sliding conditions. Correlations between tensile strength, elongation and wear volume and the primary dendritic arm spacing (lambda(1)) have been determined. The worn samples were analyzed by scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS) and the wear scar topographies by a confocal profilometer. The analysis of the worn surfaces revealed a change from abrasive to adhesive wear mechanism for Al-Sn-Cu alloys and only adhesive one for Al-Sn-Si alloys. For Al-Sn-Cu alloys, the best wear resistance was observed to be related to coarser microstructures whereas refined microstructures improved the tensile properties, indicating an inverse trend between tensile and tribological properties. The wear resistance of the Al-Sn-Si alloys were shown not to be affected by the size of lambda(1), however the tensile strength is shown to increase significantly with the decrease in lambda(1). (C) 2016 Elsevier B.V. All rights reserved.
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