High Temperature Creep in a Zr-1wt.%Nb Alloy

0450440 - ÚFM 2016 RIV FR eng A - Abstract
Sklenička, Václav - Kuchařová, Květa - Kvapilová, Marie - Král, Petr - Kloc, Luboš
High Temperature Creep in a Zr-1wt.%Nb Alloy.
BOOK OF ABSTRACTS. 13th International Conference on Creep and Fracture of Engineering Materials and Structures. Toulouse: Institut Carnot CIRIMAT, 2015. s. 295-296.
[CREEP 2015 - International Conference on Creep and Fracture of Engineering Materials and Structures /13./. 31.05.2015-04.06.2015, Toulouse]
R&D Projects: GA TA ČR TA02011025; GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : creep * deformation mechanism * Zr Aloy
Subject RIV: JG - Metallurgy

This paper presents experimental results regarding high temperature behaviour of a Zr-1wt.%Nb alloy corresponding to LOCA situation of fuel cladding tubes for nuclear reactor. The tube exhibited equiaxed α grains with an initial grain size of about 5 µm. Constant stress uniaxial tensile creep tests were carried out at temperatures from 550 to 800° C over a wide range of the applied stress up to a true strain of about 40%. From the creep data was identified presence of power-law creep, which is dislocation climb controlled (self-diffusion controlled). Then the activation energy for creep Qc should be fairly consistent with that of self-diffusion. The determined activation energies of 243-269 kJ/mol fall within the range of self-diffusion activation energies.
Permanent Link: http://hdl.handle.net/11104/0251772