The cyclic stress-strain response of polycrystalline,pseudoelastic Cu-14.5 wt pct Al-3 wt pct Ni alloy |
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Authors: | N Y C Yang C Laird D P Pope |
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Affiliation: | (1) Laboratory for Research on the Structure of Mater, University of Pennsylvania, Pennsylvania, USA;(2) Department of Metallurgy and Materials Science, University of Pennsylvania, Pennsylvania, USA |
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Abstract: | Limited results on the fatigue of pseudo-elastic material indicate that, as a class, these materials should have truly outstanding
fatigue properties. To check this, the mechanisms of cyclic deformation and fracture have been studied in Cu−Al−Ni chosen
because its transformation behavior is well understood. Since this alloy is notoriously brittle, pulsating compression fatigue
tests were carried out in polycrystalline material. The details of the stress-induced martensite behavior were studied byin situ video observations. The alloy was found to undergo cyclic hardening and failure eventually occurred by multiple nucleation
of cracks at grain boundaries, by a mechanism similar in principle to that which occurs in regular metals cycled at high plastic
strains. The Coffin-Manson law was obeyed. |
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