Tracer diffusion in α-Zr

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.…”

Interdiffusion in β-Ti–Zr binary alloys

“…In addition to various diffusion studies of interstitial oxygen and nitrogen in these metals and alloys [2][3][4][5][6][7][8], many works are related to the self-diffusion and the impurity diffusion in these materials, as well in ␣-Ti [9][10][11][12][13][14][15], ␣-Zr [16][17][18][19][20][21], ␣-Hf [22,23] phases as in ␤-Ti [24][25][26][27][28], ␤-Zr [29][30][31][32] or ␤-Hf [33] phases. A summary of the results former to 1966 was published in the work of Adda and Philibert [34].…”

Steady-state creep of α-zirconium at temperatures up to 850 °C

“…Restoration mechanisms (in addition to dynamic recovery) effect of iron on the self-diffusion of zirconium. [22,33,[35][36][37][38][39][40][41][42] The diffusion coefficient of (interstitial) iron in zirconium might include grain growth and/or recrystallization, which tends to increase the creep rate, increasing the apparent has been reported to be approximately eight orders of magnitude faster than the zirconium self-diffusion coefficient over activation energy above that of self-diffusion. It has been shown that significant grain growth occurs in zirconium [12,14] a range of temperatures.…”