The University of Southampton
University of Southampton Institutional Repository

The mechanisms of long fatigue crack growth behaviour in Al–Si casting alloys at room and elevated temperature

Moffat, A.J., Mellor, B.G., Sinclair, I. and Reed, P.A.S. (2007) The mechanisms of long fatigue crack growth behaviour in Al–Si casting alloys at room and elevated temperature Materials Science and Technology, 23, (12), pp. 1396-1401. (doi:10.1179/174328407X243988).

Record type: Article


Pistons are commonly made from multicomponent Al–Si casting alloys, which have complex, interconnecting three-dimensional (3D) networks of secondary phase particles. They are non-serviceable parts and so must be able to withstand high cycle fatigue while operating at temperatures between 30 and 80% of Tm. Long fatigue crack growth tests were performed at room temperature (RT) and 350uC to assess the micromechanisms of fatigue. The fracture profiles at low and high da/dN were analysed; at low crack growth rates at both temperatures there is no crack path preferentiality with respect to the microstructure. At high da/dN in the RT sample the crack growth occurs preferentially via hard particles, while at 350uC there is a change in mechanism and the crack appears to avoid hard particles. X-ray tomography has been used to image the crack tips and gain a detailed insight into the mechanisms of fatigue in these complex 3D microstructures.

Full text not available from this repository.

More information

Published date: December 2007
Keywords: fatigue, Al-Si alloys, microchrome mechanisms, tomography, high temperature
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 48825
ISSN: 0267-0836
PURE UUID: e01c3c52-c873-4741-a0ed-53353bd8a1a6
ORCID for P.A.S. Reed: ORCID iD

Catalogue record

Date deposited: 20 Dec 2007
Last modified: 17 Jul 2017 14:58

Export record



Author: A.J. Moffat
Author: B.G. Mellor
Author: I. Sinclair
Author: P.A.S. Reed ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.