Microstructural analysis of fatigue initiation in Al-Si casting alloys


Moffat, A.J., Mellor, B.G., Chen, C.L., Thomson, R.C. and Reed, P.A.S. (2006) Microstructural analysis of fatigue initiation in Al-Si casting alloys. In, Poole, W.J., Wells, M.A. and Lloyd, D.J. (eds.) Aluminium Alloys 2006: Innovation Through Research and Technology. 10th International Conference on Aluminum Alloys Switzerland, Trans Tech, 1083-1088. (Materials Science Forum 519-521).

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Description/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.

Item Type: Book Section
Additional Information: Series ISSN 0255-5476
ISBNs: 0878494081 (hardback)
Related URLs:
Keywords: fatigue, piston, short crack, phase mapping
Subjects: T Technology > TN Mining engineering. Metallurgy
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 27812
Date Deposited: 10 Jan 2007
Last Modified: 27 Mar 2014 18:16
Publisher: Trans Tech
URI: http://eprints.soton.ac.uk/id/eprint/27812

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