Add time:07/27/2019         Source:sciencedirect.com

The fatigue strength of polycrystalline cp-Ti depends on a variety of different factors especially its plastic deformation mechanism. Deformation twinning is activated as a major deformation mechanism in cp-Ti during cyclic deformation. The fatigue-induced twin transformation developing on the surface of the cp-Ti specimens is accompanied with the microstructure irregularities, which affect the cohesive properties of grain boundaries and thus its fatigue cracking. The twinned grains serve as preferential sites for the localized shear and act as preferred path for crack propagation. The texture evolution was observed during cyclic deformation in cp-Ti which can be explained by the high twinning activity. The residual stress relaxation takes place significantly by imposing a mechanical loading.

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