Paper Title:
Microstructural Analysis of Fatigue Initiation in Al-Si Casting Alloys
  Abstract

Fatigue initiation behaviour in three multi-component Al-Si casting alloys with varying Si content is compared using a range of microscopy and analytical techniques. A higher proportion of stiffer secondary phases leads to load transfer effects reducing particle cracking and particle/matrix debonding. Si appears stronger than the Al9FeNi phase, which cracks and debonds to form initiation sites preferentially over Si. Reducing Si content results in clusters of intermetallics forming, and increased porosity. The effect of porosity, combined with mesoscopic load transfer effects to the high volume fraction intermetallic regions make these potent crack initiation sites in low silicon alloys.

  Info
Periodical
Materials Science Forum (Volumes 519-521)
Edited by
W.J. Poole, M.A. Wells and D.J. Lloyd
Pages
1083-1088
DOI
10.4028/www.scientific.net/MSF.519-521.1083
Citation
A. J. Moffat, B.G. Mellor, C.L. Chen, R. C. Thomson, P.A.S. Reed, "Microstructural Analysis of Fatigue Initiation in Al-Si Casting Alloys", Materials Science Forum, Vols. 519-521, pp. 1083-1088, 2006
Online since
July 2006
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Price
$32.00
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