SYMPOSIA PAPER Published: 01 January 1989

Magnetic Study of Zircaloy


Although the β-phase has been reported to be a supersaturated solid solution with a small amount of elements, such as iron, chromium, nickel, and so forth, it was found that the phase of Zircaloy-4 after heat treatments above 830°C quenching and 1030°C annealing is in a superparamagnetic state which contains particles of Zr(Fe1-xCrx)2 so small (10 to 20 Å) that they can not be detected by usual methods. The β-phase of Zircaloy-2 may be in a similar state to Zircaloy-4 but can not be called a superparamagnetic state because of nonmagnetism of responsible precipitates. In order to give a deeper understanding of “nodular corrosion,” magnetic measurements of susceptibility and magnetization were carried out on Zircaloy-2 and -4 before and after heat treatments at 0.1 to 1 T from temperature of liquid nitrogen to room temperature. Magnetization curves at temperature of liquid nitrogen for Zircaloy-4 correspond closely to the calculated Langevin function. After heat treatments above 900°C, magnetization for Zircaloy-4 increases more than three times. This means that the amount of small particles of ferromagnetic precipitates is increased by heat treatments.

Author Information

Miyake, C
Faculty of Engineering, Osaka University, Osaka, Japan
Takamiya, T
Faculty of Engineering, Osaka University, Osaka, Japan
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Developed by Committee: B10
Pages: 487–497
DOI: 10.1520/STP18883S
ISBN-EB: 978-0-8031-5084-3
ISBN-13: 978-0-8031-1199-8