Abstract
IT has long been suspected that the room-temperature fatigue properties of age-hardened aluminium alloys are dependent upon any over-ageing that may occur during a fatigue test1. This has recently been directly verified by comparison of fatigue behaviour at room and liquid-air temperatures2. It is supposed that alternating stresses cause dislocation movements which in turn generate vacant lattice sites. At room temperature these are mobile and can give rise to over-ageing by reason of the increase in the local diffusion-rate. At liquid-air temperatures this cannot occur, and the fatigue properties are much superior.
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References
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BROOM, T., WHITTAKER, V. Slip during Fatigue of an Age-hardened Alloy. Nature 177, 486–487 (1956). https://doi.org/10.1038/177486a0
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DOI: https://doi.org/10.1038/177486a0
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