Journal of the Society of Materials Science, Japan
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Original Papers
Effect of Annealing on High-Cycle Fatigue of an Al-Mg-Sc Alloy Produced by Equal-Channel Angular Pressing
Chihiro WATANABERyoichi MONZENKazue TASAKI
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2006 Volume 55 Issue 9 Pages 837-842

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Abstract
The effect of short time annealing on the high-cycle fatigue behavior of an ultrafine grained Al-Mg-Sc alloy produced by equal channel angular pressing (ECAP) has been studied. Transmission electron microscopy revealed that small Al3Sc precipitate particles initially restricted grain growth and then the Al3Sc particles coarsened, allowing homogeneous grain growth during annealing at 350°C. The as-ECAP specimen exhibited high tensile strength, but low ductility. The annealed ECAP specimens showed slightly smaller values of 0.2% proof stress and ultimate tensile stress, and fairly larger values of elongation to failure than the as-ECAP specimen. In the as-ECAP specimens, cyclic softening was observed, whereas the annealed ECAP specimens exhibited no cyclic softening. The existence of Al3Sc particles produced by the annealing enhanced the uniform deformation and the absence of cyclic softening in the annealed ECAP specimens. These resulted in increase of remarkably prolonged high-cycle fatigue lives in comparison with the as-ECAP specimen.
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© 2006 by The Society of Materials Science, Japan
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