Abstract
We proposed intermittent ultrasonic-assisted equal-channel angular pressing (IU-ECAP) and used it to produce ultrafine-grained copper. The main aim of this work was to investigate the microstructure and mechanical properties of copper processed by IU-ECAP. We performed experiments with two groups of specimens: group 1 used conventional ECAP, and group 2 combined ECAP with intermittent ultrasonic vibration. The extrusion forces, microstructure, mechanical properties, and thermal stability of the two groups were compared. It was revealed that more homogeneous microstructure with smaller grains could be obtained by IU-ECAP compared with copper obtained using the traditional ECAP method. Mechanical testing showed that IU-ECAP significantly reduced the extrusion force and increased both the hardness and ultimate tensile stress owing to the higher dislocation density and smaller grains. IU-ECAP promotes conversion from low-angle grain boundaries to high-angle grain boundaries, and it increases the fractions of subgrains and dynamic recrystallized grains. Group 2 statically recrystallized at a higher temperature or longer duration than group 1, showing that group 2 had better thermal stability.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (No. 51575360, No. 51375315 and No. 51405306), Major Science and Technology Project of Guangdong Province (No. 2014B010131006), PhD Start-up Fund of Natural Science Foundation of Guangdong Province (No. 2016A030310036), Science and Technology Project of Shenzhen (No. JSGG20140519104809878), the Science and Technology Project of Nanshan District of Shenzhen (No. KC2014JSJS0008A), the Research and Development Foundation of Science and Technology of Shenzhen (No. JCYJ20140418095735629, No. JCYJ20140418181958498 and No. JCYJ20150525092941026). The authors are also grateful to their colleagues for essential contribution to the work.
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Manuscript submitted January 20, 2016.
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Lu, J., Wu, X., Liu, Z. et al. Microstructure and Mechanical Properties of Ultrafine-Grained Copper Produced Using Intermittent Ultrasonic-Assisted Equal-Channel Angular Pressing. Metall Mater Trans A 47, 4648–4658 (2016). https://doi.org/10.1007/s11661-016-3622-4
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DOI: https://doi.org/10.1007/s11661-016-3622-4