Grain size reduction of copper subjected to repetitive uniaxial compression combined with accumulative fold |
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Authors: | Zou Yong-Tao Lei Li Wang Zhao Wang Jiang-Hu Zhang Wei and He Duan-Wei |
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Institution: | Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; College of Physical Science and Technology, Sichuan University, Chengdu 610064, China |
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Abstract: | This paper reports a novel method of repetitive uniaxial compression
combined with accumulative fold for preparing bulk submicron- to
nanocrystalline copper starting with a coarse grained counterpart.
Grain size reduction and microstrain variations of the high purity
copper samples after different passes of compression and fold are
investigated by scanning electron microscope and x-ray diffraction
(XRD), respectively. Our results show that the average grain size of
samples decreases from about 830nm to 127nm as the number of
compression passes increases to 30. Microstrain in the compressed
sample is found to increase for the first 20 passes, but to decrease at
the last 10 passes. The variations of compressive yield strength and
the shift of XRD peaks to larger diffraction angles are observed in
the squeezed sample. Our experimental results demonstrate that the
repetitive uniaxial compression combined with accumulative fold is
an effective method to prepare bulk nanocrystalline metallic
materials, in particular for soft metals such as Cu, Al and Pb. |
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Keywords: | uniaxial compression accumulative fold grain size reduction bulk nanocrystalline materials |
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