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Dynamic recrystallization in high-purity aluminum single crystal under frictionless deformation mode at room temperature

Published online by Cambridge University Press:  11 October 2013

Yong Seok Choi ,
Kyung Il Kim ,
Kyu Hwan Oh ,
Heung Nam Han ,
Suk Hoon Kang ,
Jinsung Jang  and
Jun Hyun Han
Yong Seok Choi
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Kyung Il Kim
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Kyu Hwan Oh
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Heung Nam Han*
Affiliation:
Department of Materials Science and Engineering and center for Iron and Steel Research, RIAM, Seoul National University, Seoul 151-744, Korea
Suk Hoon Kang
Affiliation:
Nuclear Material Research Division, Korea Atomic Energy Research Institute, Yuseong-gu, Daejeon 305-353, Korea
Jinsung Jang
Affiliation:
Nuclear Material Research Division, Korea Atomic Energy Research Institute, Yuseong-gu, Daejeon 305-353, Korea
Jun Hyun Han*
Affiliation:
Department of Nanomaterials Engineering, Chungnam National University, Daejeon 305-764, Korea
*
a)Address all correspondence to this author. e-mail: jhhan@cnu.ac.kr
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Abstract

Dynamic recrystallization (DRX) of 99.9999% aluminum single crystal at room temperature was examined under frictionless deformation mode. To exclude the self-heating of the specimen due to applied high strain, a microcrack that localizes the stress at a very small region was intentionally introduced by controlled local necking. For the in situ observation of DRX, a specially designed in situ microdeformation device was positioned inside an electron backscattered diffraction system chamber. Recrystallized grains showed relatively random texture and preferred growth direction. The subgrains with low-angle grain boundaries formed by dynamic recovery transformed into small grains with high-angle grain boundaries, acting as nuclei for discontinuous dynamic recrystallization and growing by further deformation. The DRX in pure aluminum can take place under frictionless tensile deformation conditions at room temperature, and the stress localization and high purity are key issues for the DRX of aluminum at room temperature.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 20 , 28 October 2013 , pp. 2829 - 2834
Copyright
Copyright © Materials Research Society 2013 

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