Development of Intergranular Stresses during In Situ Compression Tests in Zircaloy-4
This paper reports results of an in-situ compression experiment carried out on a hot rolled Zircaloy-4 plate at ENGIN-X, ISIS. The experiment was aimed at characterizing the plastic anisotropy of the alloy, which can give rise to high intergranular stresses in the polycrystal. As expected from the c...
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Veröffentlicht in: | Materials science forum 2008-01, Vol.571-572, p.149-154 |
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Sprache: | eng |
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Zusammenfassung: | This paper reports results of an in-situ compression experiment carried out on a hot rolled
Zircaloy-4 plate at ENGIN-X, ISIS. The experiment was aimed at characterizing the plastic
anisotropy of the alloy, which can give rise to high intergranular stresses in the polycrystal. As
expected from the crystal anisotropy, the various lattice reflections had very different behaviours. In
the compression directions, the basal reflections appeared to bear much more load than the
other planes. The resulting intergranular elastic strains could therefore reach up to 5000 microstrain
after 10% total deformation, and were responsible for high type II residual stresses after unloading.
Considering the macroscopic behaviour, the normal direction had higher mechanical properties than
the other two processing directions. The strong texture measured from EBSD measurements suggest
that the crystal anisotropy has been brought to a macroscopic level. The experiment also evidenced
a significant change in texture for compression along the rolling direction which indicates twinning
activation. |
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ISSN: | 0255-5476 1662-9752 1662-9752 |
DOI: | 10.4028/www.scientific.net/MSF.571-572.149 |