Detwinning of High-Purity Zirconium: <Emphasis Type="Italic">In-Situ</Emphasis> Neutron Diffraction Experiments |
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Authors: | G Proust G C Kaschner I J Beyerlein B Clausen D W Brown R J McCabe C N Tomé |
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Institution: | (1) Los Alamos National Laboratory, Los Alamos, NM 87545, USA;(2) School of Civil Engineering Australian Key Centre for Microscopy & Microanalysis, University of Sydney, Sydney, NSW, 2006, Australia |
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Abstract: | Twinning is an important deformation mode in hexagonal metals to accommodate deformation along the c-axis. It differs from slip in that it accommodates shear by means of crystallographic reorientation of domains within the
grain. Such reorientation has been shown to be reversible (detwinning) in magnesium alloy aggregates. In this paper we perform
in-situ neutron diffraction reversal experiments on high-purity Zr at room temperature and liquid nitrogen temperature, and follow
the evolution of twin fraction. The experiments were motivated by previous studies done on clock-rolled Zr, subjected to deformation
history changes (direction and temperature), in the quasi-static regime, for temperatures ranging from 76 K to 450 K. We demonstrate
here for the first time that detwinning of { 10`1] 2 }
á 10`1]`1]
ñ\left\{ {10\overline 1 2} \right\}\left\langle {10\overline 1 \overline 1 } \right\rangle tensile twins is favored over the activation of a different twin variant in grains of high-purity polycrystalline Zr. A visco-plastic
self-consistent (VPSC) model developed previously, which includes combined slip and twin deformation, was used here to simulate
the reversal behavior of the material and to interpret the experimental results in terms of slip and twinning activities. |
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