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In situ SEM studies on the effects of particulate reinforcement on fatigue crack growth mechanism of aluminium-based metal-matrix composite by M. J. Hadianfard; Y. -W. Mai is a Engineering article available to read on EtoBox.

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The effects of particulate reinforcement on the fatigue behaviour and fatigue mechanisms of two 6061 aluminium-based metal-matrix composites (MMCs) in three different heattreatment conditions were studied in situ with a scanning electron microscope and compared to the unreinforced alloy in the as-received condition. It was observed that the fatigue properties of the MMCs were influenced by the ceramic particles in two ways: firstly the particles increased the fatigue stress intensity threshold mainly by crack-deflection and crack-closure mechanisms, and secondly, the particles raised the fatigue crack growth rates in the Paris region by providing an easy crack path. The effect of ageing was small on the fatigue stress intensity threshold of MMCs, but for the peak-aged MMCs the fatigue crack growth rates in the Paris region were faster. The mechanism of fatigue crack growth was largely associated with the matrix/particle interface and the linkage with subcracks initiated ahead of the main crack at high applied stress intensity factors.

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Author

M. J. Hadianfard; Y. -W. Mai

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0022-2461)

Published

1995

Language

EN

Field

Engineering (Physical Sciences)