Erosion mechanisms in aluminum and Al-Si alloys

Steady state erosion rates were measured for pure aluminum and an Al-12wt.%Si eutectic alloy at an impact angle of 30°. The erosion rates of the Al-12Si alloy can be significantly higher than those of pure aluminum under identical erosion conditions. Since the indentation hardness of the alloy is ab...

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Bibliographic Details
Published in:Wear 1986-01, Vol.107 (2), p.175-181
Main Authors: Hovis, S.K., Talia, J., Scattergood, R.O.
Format: Article
Language:English
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Summary:Steady state erosion rates were measured for pure aluminum and an Al-12wt.%Si eutectic alloy at an impact angle of 30°. The erosion rates of the Al-12Si alloy can be significantly higher than those of pure aluminum under identical erosion conditions. Since the indentation hardness of the alloy is about a factor of 3 greater than that of pure aluminum, this implies that the hardness, or flow stress, is itself insufficient as a measure of erosion resistance in this alloy system. Cross-sectional optical micrographs of the steady state erosion surfaces show that in pure aluminum extensive folding and lateral material displacement results from repeated impacts. In Al-12Si there is much less material displacement and this is attributed to the finely dispersed silicon platelets which can act as initiation sites for micromachining chip fractures.
ISSN:0043-1648
1873-2577
DOI:10.1016/0043-1648(86)90026-8