Photoacoustic studies on zircaloy-2

P. Palanichamy1, C. Sanjeeviraja2, K. Ramachandran3, K. Jeyadheepan2 and P. Kalyanasundaram1

1NDE Division, Indira Gandhi Center for Atomic Research, Kalpakkam, India
2School of Physics, Alagappa University, Karaikudi, India
3School of Physics, Madurai Kamaraj University, Madurai, India

Keywords: photoacoustic
property: thermal parameter
material: zircaloy-2

Zircaloy-2, a very useful material in reactors, where the energy fuels will pass through these tubes, would undergo physical changes due to high pressure, temperature and radiation in the tube and here photoacoustic technique is used to analyse the impact of defects on the thermal properties. Zircaloy-2 samples after β-quenching, for different thickness were first analysed by XRD, ultrasonics and metallography. XRD pictures reveal that there is not much deformation or phase transformation and it retains the same structure. Photoacoustic measurements are carried out for depth profile and wavelength scanning. PA signal amplitude versus chopping frequency. Thermal diffusivity values for all the samples are summarized in Table.3 along with the other experimental value. Here it is found that there is a marginal change in the thermal diffusivity and hence the thermal conductivity whereas the PA spectrum shows that there is no extra peak except of the parental peak. The increase in thermal conductivity indicates that there is an increase in the mean free path between collisions and the defect concentration becomes smaller. i.e. the samples tend to go towards crystallization which agree very well with the ultrasonic and metallographic results. The hardness of the sample will now increase as thermal diffusivity which was also seen in metallography.

  1. T. Jayakumar, P. Palanichamy and Baldev Raj. Journal of Nuclear Materials, 255, 243(1998).

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