Elevated temperature short crack fatigue behaviour in near eutectic Al-Si alloys
Elevated temperature short crack fatigue behaviour in near eutectic Al-Si alloys
This paper considers two candidate automotive piston alloys and highlights the influence of microstructural features on fatigue behaviour. Fatigue initiation and subsequent short crack growth was assessed at 20, 200 and 350 °C. It is shown that both temperature and test frequency have a strong influence on the fatigue performance of the materials tested. The microstructure was quantitatively characterised in terms of the primary Si distribution. Together with post failure analysis, this allowed identification of critical microstructural features affecting both fatigue crack initiation and early growth. Large primary Si particles were found to act as preferential initiation sites by cracking or decohesion (dependent on test temperature) and are also sought out preferentially during short crack growth.
fatigue, elevated temperature, microstructure, aluminium–silicon
863-869
Joyce, M.R.
e294d1ba-c37a-4149-b9c0-15095d643d3b
Styles, C.M.
5995ea42-b91f-4e21-aaf9-cbe4252e587a
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
2003
Joyce, M.R.
e294d1ba-c37a-4149-b9c0-15095d643d3b
Styles, C.M.
5995ea42-b91f-4e21-aaf9-cbe4252e587a
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Joyce, M.R., Styles, C.M. and Reed, P.A.S.
(2003)
Elevated temperature short crack fatigue behaviour in near eutectic Al-Si alloys.
International Journal of Fatigue, 25 (9-11), .
(doi:10.1016/S0142-1123(03)00157-9).
Abstract
This paper considers two candidate automotive piston alloys and highlights the influence of microstructural features on fatigue behaviour. Fatigue initiation and subsequent short crack growth was assessed at 20, 200 and 350 °C. It is shown that both temperature and test frequency have a strong influence on the fatigue performance of the materials tested. The microstructure was quantitatively characterised in terms of the primary Si distribution. Together with post failure analysis, this allowed identification of critical microstructural features affecting both fatigue crack initiation and early growth. Large primary Si particles were found to act as preferential initiation sites by cracking or decohesion (dependent on test temperature) and are also sought out preferentially during short crack growth.
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Published date: 2003
Additional Information:
International Conference on Fatigue Damage of Structural Materials IV
Keywords:
fatigue, elevated temperature, microstructure, aluminium–silicon
Identifiers
Local EPrints ID: 22415
URI: http://eprints.soton.ac.uk/id/eprint/22415
ISSN: 0142-1123
PURE UUID: c838993e-fdb7-4b27-b0fb-c092c12cd10c
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Date deposited: 22 Mar 2006
Last modified: 16 Mar 2024 02:44
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Author:
M.R. Joyce
Author:
C.M. Styles
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