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Editorial

Metal Crystal/Polycrystal Plasticity and Strengths

by
Ronald W. Armstrong
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Metals 2022, 12(12), 2070; https://doi.org/10.3390/met12122070
Submission received: 8 November 2022 / Accepted: 14 November 2022 / Published: 1 December 2022

Abstract

A brief historical sketch is given of Taylor’s dislocation density-based model description, leading to the prediction of a parabolic, tensile, stress–strain curve for the plastic deformation of aluminum. The present focus is on additional results or analyses obtained on the subject for crystal/polycrystal strain hardening. Our current understanding of such material behavior is attributed to post-Taylor descriptions of sequential deformation stages in stress–strain measurements that are closely tied to specific dislocation interaction and reaction mechanisms. A schematic comparison is given for individual face-centered cubic (fcc), body-centered cubic (bcc), and hexagonal close-packed (hcp) crystal curves and to related strength properties determined for individual crystals and polycrystalline material. For the fcc case, an example sessile dislocation reaction is described based on a stereographic projection. Then, quantitative constitutive-relation-based assessments are presented for the tensile strain hardening leading to the plastic instability behaviors of copper and tantalum materials.
Keywords: Taylor-based strain hardening; crystal plastic deformation stages; deformation-induced dislocation interactions/reactions; polycrystal tensile plastic instability Taylor-based strain hardening; crystal plastic deformation stages; deformation-induced dislocation interactions/reactions; polycrystal tensile plastic instability

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MDPI and ACS Style

Armstrong, R.W. Metal Crystal/Polycrystal Plasticity and Strengths. Metals 2022, 12, 2070. https://doi.org/10.3390/met12122070

AMA Style

Armstrong RW. Metal Crystal/Polycrystal Plasticity and Strengths. Metals. 2022; 12(12):2070. https://doi.org/10.3390/met12122070

Chicago/Turabian Style

Armstrong, Ronald W. 2022. "Metal Crystal/Polycrystal Plasticity and Strengths" Metals 12, no. 12: 2070. https://doi.org/10.3390/met12122070

APA Style

Armstrong, R. W. (2022). Metal Crystal/Polycrystal Plasticity and Strengths. Metals, 12(12), 2070. https://doi.org/10.3390/met12122070

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