Fatigue of an Al-Si gravity die casting alloy

Styles, C.M. and Reed, P.A.S. (2000) Fatigue of an Al-Si gravity die casting alloy. In, Starke, Jr., E.A., Sanders, T.H. and Cassada, W.A. (eds.) Aluminium Alloys: Their Physical and Mechanical Properties. 7th International Conference ICAA7 Switzerland, Trans Tech, 1457-1462. (Materials Science Forum 331-337).


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Fatigue crack initiation, short crack and long crack growth studies were performed on a high performance cast piston type alloy (Al-Si-Cu-Ni-Mg). Crack initiation was mainly associated with large blocky Si particles although a few cracks were initiated at clusters of FeNiAls intermetallics. Classical short crack growth was shown with crack arrest for up to 15000 fatigue cycles at second phase particles. Long crack growth showed no evidence of Stage I like facets near threshold or ductile striations in the mid Delta K region. A large number of fractured Si particles were, however, observed on the fracture sur faces and crack profiles the incidence of which increased with Delta K. The findings of this study suggest this alloy is brittle in nature with the Si particle content generally controlling fatigue crack initiation and growth.

Item Type: Book Section
Additional Information: Series ISSN 0255-5476
ISBNs: 0878498532 (hardback)
ISSNs: 0255-5476 (print)
Related URLs:
Keywords: Al-Si alloy, fatigue crack initiation and growth, long crack growth, micromechanisms
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: 43071
Accepted Date and Publication Date:
Date Deposited: 10 Jan 2007
Last Modified: 31 Mar 2016 12:16
URI: http://eprints.soton.ac.uk/id/eprint/43071

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