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 Poole, W.J., Wells, M.A. and Lloyd, D.J. (eds.) In Aluminium Alloys 2006: Innovation Through Research and Technology. Trans Tech., pp. 1083-1088.


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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: Conference or Workshop Item (Paper)
Additional Information: Series ISSN 0255-5476
ISBNs: 0878494081 (print)
Venue - Dates: 10th International Conference on Aluminum Alloys, 2006-07-09 - 2006-07-13
Related URLs:
Keywords: fatigue, piston, short crack, phase mapping
Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 27812
Date :
Date Event
July 2006Published
Date Deposited: 10 Jan 2007
Last Modified: 16 Apr 2017 22:29
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/27812

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