Fatigue Property and Fatigue Crack Propagation Behavior of Al2O3/A6061 MMCs at Room and Elevated Temperature

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The rotating bending fatigue tests in high cycle region were carried out on alumina short fiber reinforced aluminum alloy composites (MMCs) at room and elevated temperatures of 200, 350, 400 and 450°C. The four kind of MMCs with 0%, 10%, 18% and 25% volume fraction were prepared in order to investigate the effects of alumina short fiber volume fraction on the fatigue property such as the fatigue strength, the crack initiation and propagation behaviors. As results, it was found that the fatigue strength at 107 cycles decreased with increase in the test temperature, but increased with an increase in alumina short fiber volume fraction at room and elevated temperatures. The crack initiation sites were large size alumina short fibers; some kind of cluster of short fibers and large size alumina particles (i.e. shots). And the crack growth paths were related to the distribution of the short fibers.

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Periodical:

Key Engineering Materials (Volumes 261-263)

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka

Pages:

1073-1078

Citation:

Y. Ochi et al., "Fatigue Property and Fatigue Crack Propagation Behavior of Al2O3/A6061 MMCs at Room and Elevated Temperature", Key Engineering Materials, Vols. 261-263, pp. 1073-1078, 2004

Online since:

April 2004

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$38.00

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1 1 10 10-11 10-10 10-9 10-8 10-7 10-6 10-5 Crack propagation rate , da/dN (m/cycle) Stress intensty factor range , �K (MPa m1/2 ) A6061 10MMC 18MMC 25MMC.

1 1 10 10-11 10-10 10-9 10-8 10-7 10-6 10-5 Crack propagation rate , da/dN (m/cycle) Stress intensty factor range , �K (MPa m1/2 ) A6061 10MMC 25MMC (a) R.T. (b) 200͠ Fig. 8 Relationship between da/dN and �K of A6061 and MMCs.