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WEAR MECHANISMS OF ABRASIVE AL – SI ALLOYS | ||
| AL-TAQANI | ||
| Article 1, Volume 19, Issue 2, 2006, Pages 46-57 | ||
| Authors | ||
| K . Mohammed Jasim; Azal R.Ismail; Haitham Rzouqi Saleh; E.S. Dwarakadasa | ||
| Abstract | ||
| Chill cast wear pins of Al-Si alloys containing 3,12 and 22 wt% Si have been slid against a continuous SiC emery paper. Bearing pressure was varied on flat bed abrasive wear test in the range 0.006 to 0.072 MPa and the wear rate was in the range 10-9-10-8 cm3.cm-1. In the Al-Si alloys wear rate decreased with increasing silicon up to eutectic composition and thereafter increased. In all the alloys, wear rate varied with load in two distinct linear regions separated by a transition point and is interpreted as purely oxidative at low loads and a combined oxidative cum metallic wear at loads higher than the transition point of 2N. Occurrence of subsurface damage was not identified in all the alloys under all condition of testing except at higher loads to 2-3 μm. Evidence has not been obtained to show the mechanical fragmentation of silicon deep in the subsurface region. | ||
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