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Influence of Microtexture on Early Plastic Slip Activity in Ti-6Al-4V Polycrystals

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Abstract

Microtextured regions are known to influence the fatigue performance of titanium alloys. Previous studies revealed that crack initiation, accounting for most of the fatigue life, is triggered by slip activity. The influence of microtextured regions on the early plastic slip activity was presently investigated by means of an in situ tensile test performed inside a scanning electron microscope on a bimodal Ti-6Al-4V polycrystalline specimen. A slip trace analysis was carried out in several regions with different crystallographic textures to highlight potentially different deformation behaviors. Significant stress heterogeneities were revealed through an early slip activation in microtextured regions with a predominant [0001] orientation. This point was shown to be related to a locally increased resolved shear stress. Consequences on behavior under cyclic loadings are finally discussed.

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Acknowledgments

The funding from the ‘‘Région Poitou-Charentes’’ (Van Truong Dang Ph.D. Grant) is gratefully acknowledged. The authors acknowledge Safran Aircraft Engines for providing the Ti-6Al-4V material used in this study. André Dragon is sincerely thanked for his diligent proofreading of the manuscript.

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Authors and Affiliations

  1. Institut Pprime, CNRS - ENSMA - Université de Poitiers, UPR CNRS 3346, Department of Physics and Mechanics of Materials, ENSMA - Téléport 2, 1 Avenue Clément Ader, BP 40109, 86961, Futuroscope Chasseneuil Cedex, France

    Samuel Hémery, Van Truong Dang, Loïc Signor & Patrick Villechaise

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  1. Samuel Hémery
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  2. Van Truong Dang
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  3. Loïc Signor
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  4. Patrick Villechaise
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Correspondence to Samuel Hémery.

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Manuscript submitted December 4, 2017.

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Hémery, S., Dang, V.T., Signor, L. et al. Influence of Microtexture on Early Plastic Slip Activity in Ti-6Al-4V Polycrystals. Metall Mater Trans A 49, 2048–2056 (2018). https://doi.org/10.1007/s11661-018-4569-4

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