Microstructural Analysis of Fatigue Initiation in Al-Si Casting Alloys

Andrew J. Moffat; B.G. Mellor; C.L. Chen; Rachel C. Thomson; P.A.S. Reed

doi:10.4028/www.scientific.net/MSF.519-521.1083

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Microstructural Factors Affecting Fatigue Initiation in Various Al Based Bearing Alloys
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Fatigue Behaviour in Fine Grained Aluminium Alloys
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Microstructural Analysis of Fatigue Initiation in Al-Si Casting Alloys
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Combined Simulation and Experiment for Friction Stir Welding Process Development
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HomeMaterials Science ForumMaterials Science Forum Vols. 519-521Microstructural Analysis of Fatigue Initiation in...

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.

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

1083-1088

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.1083

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Online since:

July 2006

Authors:

Andrew J. Moffat, B.G. Mellor, C.L. Chen, Rachel C. Thomson, P.A.S. Reed

Keywords:

Fatigue, Phase Mapping, Piston, Short Crack

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