The effect of volume fraction of SiC particles on the fatigue crack propagation characteristics of 6061 aluminum alloys reinforced with SiC particles (SiCp/6061-T6 composites) manufactured by powder metallurgy was investigated. In a higher stress intensity range, unstable fatigue crack propagation was found as the threshold stress intensity range ΔKth and ΔKeff.th increased with increasing content of SiC particles. ΔKeff.th is suggested to be solely a function of the mean SiC particle size and to be independent of the volume fraction. This implies that for near-threshold crack extension, the maximum plastic zone size at the crack tip must exceed the mean SiC particle size.
|ジャーナル||Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals|
|出版ステータス||出版済み - 1991|
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