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Metals 2017, 7(8), 287;

Precipitate Stability in a Zr–2.5Nb–0.5Cu Alloy under Heavy Ion Irradiation

Department of Mechanical and Materials Engineering, Queen’s University, Kingston, ON K7L 3N6, Canada
Material Science Division Argonne National Laboratory, Argonne, IL 60439, USA
Authors to whom correspondence should be addressed.
Received: 4 July 2017 / Revised: 21 July 2017 / Accepted: 24 July 2017 / Published: 27 July 2017
(This article belongs to the Special Issue Zirconium Alloys)
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The stability of precipitates in Zr–2.5Nb–0.5Cu alloy under heavy ion irradiation from 100 °C to 500 °C was investigated by quantitative Chemi-STEM EDS analysis. Irradiation results in the crystalline to amorphous transformation of Zr2Cu between 200 °C and 300 °C, but the β–Nb remains crystalline at all temperatures. The precipitates are found to be more stable in starting structures with multiple boundaries than in coarse grain structures. There is an apparent increase of the precipitate size and a redistribution of the alloying element in certain starting microstructures, while a similar size change or alloying element redistribution is not detected or only detected at a much higher temperature in other starting microstructures after irradiation. View Full-Text
Keywords: Zr–2.5Nb–0.5Cu; precipitate stability; heavy ion irradiation; Zr2Cu; Zr2Fe Zr–2.5Nb–0.5Cu; precipitate stability; heavy ion irradiation; Zr2Cu; Zr2Fe

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Dong, Q.; Yao, Z.; Wang, Q.; Yu, H.; Kirk, M.A.; Daymond, M.R. Precipitate Stability in a Zr–2.5Nb–0.5Cu Alloy under Heavy Ion Irradiation. Metals 2017, 7, 287.

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