NRSF2 Phase Mapping Measurements of H-Charged Zircaloy-4
User Program study with E. Garlea and H. Choo of University of Tennessee
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  Diff. and Therm. Prop. Group
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The hydride phase distribution in electrochemically charged Zr alloy and effect on stresses ahead of a crack tip is being studied using neutron diffraction methods at the new NRSF2 strain and phase mapping instrument at HFIR (Figs. 5-17 and 5-18). Initial diffraction data were collected during instrument commissioning in August. This study is one part of the LDRD project “Development of In Situ Neutron Diffraction Capabilities for Studies of Deformation and Fracture Behavior under Hydrogen-Rich Environments.” The precracked Zr alloy compact tension specimen had been electrochemically charged with hydrogen prior to the measurements. It was mounted on a small load frame on NRSF2 and was examined with a gage volume of 1 x 1 x 10 mm with through-thickness steps of 0.25 mm.       

 

 Fig. 5-17. Above: a small load frame was mounted on NRSF2 for neutron phase mapping. Right: Zr alloy compact tension specimen mounted in the small load.

 Fig. 5-18. Segment of the
diffraction pattern showing
two Zr alloy and two Zr
 hydride diffraction peaks.


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Acknowledgments

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