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Mechanics of Intermittent Plasticity Punctuated by Fracture During Shear Deformation of Mg Alloys at Near-Ambient Temperatures

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Abstract

Microstructure evolution of basal-textured Mg alloy AZ31B (Mg: Al: Zn; 96: 3: 1 wt pct) during simple shear deformation at near-ambient temperatures was studied by plane-strain machining. Using Schmid factor calculations in conjunction with quantitative electron microscopy, it was found that plastic deformation in AZ31B in the primary deformation zone of machining commences by extension twinning followed by basal slip. Characteristics of twinning in individual grains were described by correlating the direction of twinning with the principal stress state. The implications of these deformation mechanics for the microstructure inherited by the freshly generated surfaces in shear-based material removal processes are examined. These include the identification of extensive surface texture reorientation at machined surfaces via extension twins, limits on surface integrities wrought by fracture events that punctuate plastic deformation, and their relationship to the cutting tool geometry.

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Acknowledgments

Support from the National Science Foundation (CMMI Grant #0856626) is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Industrial Engineering, Swanson School of Engineering, University of Pittsburgh, 3700 O’Hara Street, Pittsburgh, PA, 15261, USA

    Saurabh Basu (Graduate Student Researcher), Sepideh Abolghasem (Graduate Student Researcher) & M. Ravi Shankar (Associate Professor)

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  1. Saurabh Basu
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  2. Sepideh Abolghasem
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  3. M. Ravi Shankar
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Correspondence to M. Ravi Shankar.

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Manuscript submitted December 14, 2012.

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Basu, S., Abolghasem, S. & Shankar, M.R. Mechanics of Intermittent Plasticity Punctuated by Fracture During Shear Deformation of Mg Alloys at Near-Ambient Temperatures. Metall Mater Trans A 44, 4558–4566 (2013). https://doi.org/10.1007/s11661-013-1796-6

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