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Title: Effect of intermetallic particles and grain boundaries on short fatigue crack growth behaviour in a cast Al–4Cu–3Ni–0.7Si piston alloy
Authors: Mbuya, T.O.
Gu, Y.
Thomson, Rachel C.
Reed, Philippa A.S.
Keywords: Cast aluminium
Fatigue
Micromechanisms of fracture
Piston alloys
Short fatigue cracks
Issue Date: 2017
Publisher: © Wiley
Citation: MBUYA, T.O. ... et al, 2017. Effect of intermetallic particles and grain boundaries on short fatigue crack growth behaviour in a cast Al–4Cu–3Ni–0.7Si piston alloy. Fatigue and Fracture of Engineering Materials and Structures, 40 (9), pp. 1428-1442.
Abstract: The short fatigue crack growth behaviour in a model cast aluminium piston alloy has been investigated. This has been achieved using a combination of fatigue crack replication methods at various intervals during fatigue testing and post-mortem analysis of crack profiles. Crack–microstructure interactions have been clearly delineated using a combination of optical microscopy, scanning electron microscopy and electron backscatter diffraction. Results show that intermetallic particles play a significant role in determining the crack path and growth rate of short fatigue cracks. It is observed that the growth of short cracks is often retarded or even arrested at intermetallic particles and grain boundaries. Crack deflection at intermetallics and grain boundaries is also frequently observed. These results have been compared with the long crack growth behaviour of the alloy.
Description: This paper is closed access until 26th January 2018.
Sponsor: The first author acknowledges the Faculty of Engineering and the Environment of the University of Southampton and the University of Nairobi for their financial support when this work was carried out.
Version: Accepted for publication
DOI: 10.1111/ffe.12586
URI: https://dspace.lboro.ac.uk/2134/26415
Publisher Link: https://doi.org/10.1111/ffe.12586
ISSN: 8756-758X
Appears in Collections:Closed Access (Materials)

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