Conference Proceedings Paper
STUDY OF ZR-2.5NB-0.5CU CANDU SPACER MATERIAL: MICROSTRUCTURE AND IRRADIATION EFFECT
41th Annual CNS-CNA Student Conference - 2017 June 05
Q. Dong (Queen's University)
H. Yu (Queen's University)
Z. Yao (Queen's University)
M. Daymond (Queen's University)
In this study, the microstructure and stability of precipitates in Zr-2.5Nb-0.5Cu alloy under heavy ion irradiation was investigated. Results show that three types of microstructure co-exist in the alloy: Widmansttatten structure, a-Zr grains without precipitates and a-Zr grains with precipitates. In the meantime, three types of second phase particles are detected: b-Nb, Zr2Cu and Zr2Fe, which have different distributions within the microstructure. The structure has significant effects on the precipitate stability under irradiation. The precipitates are much more stable in microstructures with multiple boundaries than in coarse grain microstructures.
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