SYMPOSIA PAPER Published: 01 January 1996
STP16193S

Non-Linear Irradiation Growth of Cold-Worked Zircaloy-2

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Accelerating irradiation growth has been reported for several zirconium alloys with a range of metallurgical states during high-temperature tests in fast-breeder reactors (673 to 723 K) for annealed Zircaloys in thermal test reactors at power reactor temperatures (523 to 623 K) and in power reactor core components fabricated from annealed or recrystallized Zircaloy. In the latter case, there was a transition from low to high irradiation growth rates at moderate fluences (about 3 × 1025 n/m2, E > 1 MeV, at 580 K) related to the nucleation and growth of basal plane c-component loops.

It was recently reported that the elongation rate of cold-worked Zircaloy-2 pressure tubes also accelerates with increased fluence at about 550 K. This gradual acceleration coincides with a gradual increase in the density of c-component dislocations as a result of the helical climb of those dislocation segments with a predominantly screw character.

New data showing the acceleration of growth of cold-worked Zircaloy-2 at 550 K are presented, and a model is presented for the irradiation growth behavior of cold-worked Zircaloy-2 based on the evolution of the sink strengths of c-component dislocations (net vacancy sinks) and a-type dislocations (net interstitial sinks) as a function of fast fluence. According to the model, the growth rate reaches a maximum when the sink strength of c-component dislocations is approximately equal to that of the a-type dislocations, and hence the growth rate tends to saturate with increasing fluence.

Author Information

Holt, RA
Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario, Canada
Causey, AR
Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario, Canada
Christodoulou, N
Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario, Canada
Griffiths, M
Atomic Energy of Canada Ltd., Chalk River Laboratories, Chalk River, Ontario, Canada
Ho, ETC
Ontario Hydro Technologies, Toronto, Canada
Woo, CH
Atomic Energy of Canada Ltd., Whiteshell Laboratories, Pinawa, Manitoba, Canada
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Developed by Committee: B10
Pages: 623–637
DOI: 10.1520/STP16193S
ISBN-EB: 978-0-8031-5343-1
ISBN-13: 978-0-8031-2406-6