The effect of fabrication variables on the load relaxation behavior of unirradiated Zircaloy sheet

Load relaxation tests were performed on Zircaloy-2 and Zircaloy-4 sheets with varied textures and microstructures. Experimental data in the form of logarithmic stress versus logarithmic strain rate curves showed characteristics which can be used to identify the deformation mechanisms involved. The low flow stress and the absence of grain boundary sliding at temperatures below 350°C found in the 0° texture Zircaloy-4 make it potentially useful as a material for fuel element cladding.