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Spatiotemporal Thermal Inhomogeneities During Compression of Highly Textured Zirconium

Abstract

Using a focal plane array infrared camera, the heat generated during large strain compression (at a rate of 1 s−1) is used to study the characteristics of plastic flow for hcp zirconium. Heat generation during plastic flow in a reference material, copper, was seen to develop uniformly both at the lower (40 μm/pixel) and higher (8 μm/pixel) magnifications used in this study. The thermomechanical response of Zr, however, was seen to depend on the loading direction with respect to the specimen texture. Highly textured zirconium compressed along nonbasal oriented grains results in a homogeneous thermal response at both scales. However, compression along basal (0001) oriented grains shows evidence of inhomogeneous deformation at small strains that lead to macroscale localization and failure at large strains. The conversion of plastic work into heat is observed to be a dynamic process, both in the time-dependent nature of the energy conversion, but also in the passage of waves and ‘bursts’ of plastic heating. Basal compression also showed evidence of small scale localization at strains far below macroscale localization, even below 10%. These localizations at the lower strain levels eventually dominate the response, and form the shear band that is responsible for the softening of the macroscopic stress–strain curve.

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Acknowledgments

This work was supported by the U.S. Department of Energy under grant DEFG03-02-NA00072, which is administered by the Center for the Simulation of Advanced Rockets (CSAR) at the University of Illinois at Urbana, as well as grant DEFG52-06-NA26150. The microscopy was carried out with the assistance of James Mabon in the Center for Microanalysis of Materials, University of Illinois, which is partially supported by the U.S. Department of Energy under grant DEFG02-91-ER45439. The assistance of Dr. Gavin Horn with the performance of the thermal measurements is also greatly appreciated. The authors would also like to thank Dr. George Kaschner for many helpful discussions. Finally, the authors would like to acknowledge the excellent comments from the unknown reviewer, which considerably improved the final outcome of this effort.

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Correspondence to J. Lambros.

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Padilla, H., Lambros, J., Beaudoin, A. et al. Spatiotemporal Thermal Inhomogeneities During Compression of Highly Textured Zirconium. Exp Mech 51, 1061–1073 (2011). https://doi.org/10.1007/s11340-010-9425-4

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Keywords

  • Infrared
  • Multiscale
  • Plastic bursts
  • Highly textured Zr