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Stored energy and recrystallization temperature in high purity copper after equal channel angular pressing

  • Ultrafine-Grained Materials
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Abstract

Equal channel angular pressing (ECAP) was conducted at room temperature to impose high strain into high purity copper. Differential Scanning Calorimeter (DSC) was used to estimate the stored energy from ECAP and recrystallization temperature. It was found that the stored energy increases upon ECAP processing until a peak is reached at 12 passes of ECAP, and a slight decrease in stored energy was observed at higher ECAP passes. The recrystallization temperature decreases upon the increase of the stored energy up to ~50 J/mol, and reaches a stable valve of ~210 °C. Partial annealing of an ECAP processed (8 passes) sample by heating to ~185 °C at a heating rate of 20 °C/min released the stored energy from ~55 to ~18 J/mol, without substantial change on the recrystallization temperature of the sample. A two parameters model was used to help calculate stored energy of ultrafine-grained copper after high strain level processing.

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Acknowledgement

This work was supported by the National Science Foundation of China under Grant No. 50474028.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, People’s Republic of China

    Yue Zhang, Jing Tao Wang, Chang Cheng & Jinqiang Liu

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  1. Yue Zhang
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  2. Jing Tao Wang
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  3. Chang Cheng
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  4. Jinqiang Liu
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Corresponding author

Correspondence to Jing Tao Wang.

Additional information

This paper is dedicated to Ultrafine Grained Materials V.

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Zhang, Y., Wang, J.T., Cheng, C. et al. Stored energy and recrystallization temperature in high purity copper after equal channel angular pressing. J Mater Sci 43, 7326–7330 (2008). https://doi.org/10.1007/s10853-008-2903-8

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  • DOI: https://doi.org/10.1007/s10853-008-2903-8

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