Effects of microstructure on the erosion |
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Authors: | Y W Shin G A Sargent and H Conrad |
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Affiliation: | (1) Korea Advanced Energy Research Institute, Chungnam, Taejun, Korea;(2) University of Dayton, 45469 Dayton, OH;(3) Department of Materials Science and Engineering, North Carolina State University, 27695-7907 Raleigh, NC |
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Abstract: | The effects of microstructure on the erosion of Al-Si alloys by 40 μm Al2O3 particles were investigated. The impact angle dependence of the erosion rate of Al and the Al-Si alloys exhibited the ductile
signature, whereas that for pure Si showed the brittle signature. The eroded surface of pure Al was characterized by craters,
lips, overlaps and folds, and platelets; that for pure Si exhibited complex radial and lateral cracking at the impact site.
At shallow impact angles these features were elongated in the direction of the tangential component of the velocity in both
materials. The measured erosion rates of the Al-Si alloys were found to be in accord with an inverse rule of mixtures based
on pure Al and pure Si; better agreement was, however, obtained if pure Al and the eutectic were taken as the two constituents
for the hypoeutectic alloys, and pure Si and the eutectic for the hypereutectic alloys. The microstructure size had two effects:
(a) scaling with respect to the impact damage zone size and (b) an influence on the physical and mechanical properties which
govern material removal. The present results are considered in terms of current models for the erosion of ductile and brittle
materials.
Formerly with the Department of Materials Engineering,
Formerly with the Department of Materials Engineering, |
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