The activation energies for creep of zircaloy-2

Circumferential creep properties of stress-relieved Zircaloy-4 and Zr–Nb–Sn–Fe cladding tubes

“…The activation energy increased from 240 to 270 kJ/mol for Zircaloy-4 as the applied stress increased from 80 to 150 MPa, while it increased from 240 to 260 kJ/mol for Zr-Nb-Sn-Fe alloy. The creep activation energy observed in this study is close to those of creep for Zircaloy-2 (245-287 kJ/mole [32,33]) and Zr (234-271 kJ/mole [33,34]), which is consistent with those of self diffusion in Zr (220-280 kJ/ mole [35,36]). One interesting observation here is that the creep activation energy increases with increasing stress as shown in Fig.…”

Creep performance of Zr-1Nb-0.75Sn-0.1Fe cladding tubes with optimized Sn content

“…4, the activation energy for creep in Zr-1Nb-0.75Sn-0.1Fe alloy tube was in the range of 210 and 260 kJ/mol, which is a slightly smaller lower value than that for Zr-1Nb-1Sn-0.1Fe alloy (240 and 260 kJ/mol). The creep activation energy observed in this study is close to those of creep for Zircaloy 2 (245-287 kJ/mol [25]) and Zr (234-271 kJ/mol [26]). The slightly greater creep activation energy in Zr-1Nb-0.75Sn-0.1Fe alloy is thought to be attrib uted to the higher Sn content.…”

Creep properties of annealed Zr–Nb–O and stress-relieved Zr–Nb–Sn–Fe cladding tubes and their performance comparison

“…The activation energy for creep deformation is in the range of between 240 and 260 kJ/mol for the Zr-Nb-Sn-Fe alloy, while it is in the range of between 240 and 280 kJ/mol for the Zr-Nb-O alloy. The creep activation energy observed in this study is close to those of creep for Zircaloy-2 (245-287 kJ/mol [29]) and Zr (234-271 kJ/mol [30]). The slightly greater creep activation energy in Zr-Nb-O is thought to be attributed to the lower contribution of grain boundary diffusion due to a lager grain size.…”