Critical Resolved Shear Stress and Work Hardening Determination in HCP Metals: Application to Zr Single Crystals - Matériaux (MAT)
Article Dans Une Revue Metals Année : 2024

Critical Resolved Shear Stress and Work Hardening Determination in HCP Metals: Application to Zr Single Crystals

Résumé

Obtaining precise parameters of deformation modes remains a significant challenge in materials science research. Critical resolved shear stresses (CRSS) and work hardening, particularly in hexagonal metals, are crucial parameters for constitutive laws in crystal plasticity. This paper presents a novel approach to determine CRSS and specific hardening matrix coefficients for commercially pure zirconium (α-Zr) at room temperature. In situ methods are employed to measure displacement fields using grids applied to the sample surface, while a comprehensive characterization of the activated deformation systems is performed via SEM and TEM. The CRSS for prismatic ⟨a⟩, pyramidal ⟨a⟩, and {10 12} and {11 21} twinning systems, as well as the self-hardening for prismatic slip and several work-hardening coefficients (for prismatic/prismatic and prismatic/pyramidal interactions), are reported in Zr single crystals. Finally, the results are compared with findings from the literature and atomistic simulations.
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hal-04708886 , version 1 (25-09-2024)

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Jean-Sébastien Lecomte, Jérôme Crépin, Pierre Barberis. Critical Resolved Shear Stress and Work Hardening Determination in HCP Metals: Application to Zr Single Crystals. Metals, 2024, 14 (1101), ⟨10.3390/met14101101⟩. ⟨hal-04708886⟩
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