Abstract
The fatigue strength of Al-4%Cu alloy thermomechanically treated was studied mainly from the viewpoints of crack initiation and propagation. The TMT processes included solution treatment at 520°C for 2hr, aging at 15°200°C for 330min, 20% cold rolling, and aging under the same condition as above. Cold rolling and aging were repeated if necessary. The fatigue strength is independent of the grain size of 0.2 to 2.0mm, because the aging structures and the mode of fatigue crack propagation unchange with respect to the grain size. The fatigue strength is increased by TMT only when aged at 150°C. Increase in the strength is attributed to the fact that wavy slip bands instead of usual planar ones, result from finely dispersed (θ+θ') structure, leading to decrease in the rate of propagation of stage II crack.
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