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Texture Evolution in Zr Grain-refined by Equal Channel Angular Pressing

Published online by Cambridge University Press:  01 February 2011

S.H. Yu ,
H.S. Ryoo ,
D.H. Shin  and
S.K. Hwang
S.H. Yu
Affiliation:
School of Materials Science and Engineering, Inha University, Incheon, Korea, 402-751
H.S. Ryoo
Affiliation:
School of Materials Science and Engineering, Inha University, Incheon, Korea, 402-751
D.H. Shin
Affiliation:
Department of Metallurgy and Materials Science, Hanyang University, Ansan, Gyunggi-Do, Korea, 425-791
S.K. Hwang
Affiliation:
School of Materials Science and Engineering, Inha University, Incheon, Korea, 402-751 Jointly appointed by the Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, Korea
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Abstract

To explore a possibility of obtaining an ultra fine grain size in hcp materials, equal channel angular pressing (ECAP) was applied to commercially pure Zr with the initial grain size of 20 μm. To ensure the crack-free specimen during the severe deformation it was necessary to adopt different die designs at the two processing temperatures, room temperature and 350°C. Submicrometer scale grains, in the order of 200 nm, were obtained by employing the die design of 90°/20° and the deformation temperature of 350°C. With the proper choice of the processing parameters, the refined grains were surrounded by the high angle boundaries. During the severe plastic deformation, the crystal texture underwent a significant change, from a fiber texture to that of a strong (0002) component mixed with a medium {1010} components, suggesting a dual <a> slip mode of deformation on the plane of the maximum shear stress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 730: Symposium V – Materials for Energy Storage, Generation, and Transport , 2002 , V5.9
Copyright
Copyright © Materials Research Society 2002

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