Micromechanisms of short fatigue crack growth in an Al-Si piston alloy
Micromechanisms of short fatigue crack growth in an Al-Si piston alloy
The short fatigue crack growth behaviour of 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 the crack profiles. Crack-microstructure interactions have been clearly delineated using a combination of optical microscopy and scanning electron microscopy. Results show that intermetallic particles and eutectic Al-Si regions 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 Al-Si eutectic regions. Crack deflection at intermetallics and eutectic Si is also frequently observed. These results have been compared with the long crack growth behaviour of the alloy.
302-309
Mbuya, Thomas O.
45e6ba08-0535-48e2-b960-3e473fd87d61
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
26 August 2014
Mbuya, Thomas O.
45e6ba08-0535-48e2-b960-3e473fd87d61
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Mbuya, Thomas O. and Reed, P.A.S.
(2014)
Micromechanisms of short fatigue crack growth in an Al-Si piston alloy.
Materials Science and Engineering: A, 612, .
(doi:10.1016/j.msea.2014.06.046).
Abstract
The short fatigue crack growth behaviour of 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 the crack profiles. Crack-microstructure interactions have been clearly delineated using a combination of optical microscopy and scanning electron microscopy. Results show that intermetallic particles and eutectic Al-Si regions 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 Al-Si eutectic regions. Crack deflection at intermetallics and eutectic Si is also frequently observed. These results have been compared with the long crack growth behaviour of the alloy.
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Al7Si-short crack paper.pdf
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e-pub ahead of print date: 23 June 2014
Published date: 26 August 2014
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 367891
URI: http://eprints.soton.ac.uk/id/eprint/367891
ISSN: 0921-5093
PURE UUID: 4a8bd71e-e466-42fb-bcdd-b56e42fef37c
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Date deposited: 20 Aug 2014 10:11
Last modified: 15 Mar 2024 02:45
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Author:
Thomas O. Mbuya
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