Strength and Plasticity of Ultra-Fine Grained Zirconium at Low Temperatures
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Published:2008-06
Issue:
Volume:584-586
Page:452-457
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ISSN:1662-9752
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Container-title:Materials Science Forum
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language:
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Short-container-title:MSF
Author:
Tabachnikova Elena D.1,
Podolskiy Aleksey V.1,
Bengus Vladimir Z.1,
Smirnov S.N.1,
Natsik V.D.1,
Azhazha V.M.2,
Tikhonovsky M.A.2,
Velikodny A.N.2,
Andrievskaya N.F.2,
Storozhilov G.E.2,
Tikhonovskaya T.M.2
Affiliation:
1. UAS
2. Kharkiv Institute of Physics and Technology
Abstract
Plasticity of ultra-fine grained (UFG) zirconium (grain size ~ 0.4 µm), produced by
intensive plastic deformation (IPD) - a combination of extrusion, annealing, and drawing, have been
studied within the temperature range 300 – 4.2 K in uniaxial compression. It was found that
decrease of grain sizes in the result of IPD leads to considerable increase of strength characteristics
for the UFG zirconium in comparison with coarse-grained (CG) zirconium (in 6 times at 300 K and
4 times at 77 K); and plasticity of the UFG zirconium keeps rather large (strain > 0.15). Two stages
of the strain-hardening and decrease of the activation volume for plastic flow with deformation have
been registered. A conclusion was made about the identity of basic deformation mechanisms in the
UFG and CG zirconium: simultaneous action and mutual influence of intragrain dislocation gliding
and twinning.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science