Photopyroelectric measurement of the thermal diffusivity of recrystallized high purity aluminum |
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| Authors: | S B Peralta S C Ellis C Christofides A Mandelis H Sang B Farahbakhsh |
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| Affiliation: | (1) Photoacoustic and Photothermal Sciences Laboratory, Department of Mechanical Engineering, and Ontario Laser and Lightwave Research Centre, University of Toronto, M5S 1A4 Toronto, Ontario, Canada;(2) Alcan International Kingston Research and Development Centre, K7L 4Z4 Kingston, Ontario, Canada;(3) Present address: Ontario Hydro Research Division, 800 Kipling Avenue, KR 139, M8Z 554 Toronto, Ontario, Canada |
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| Abstract: | Thermal diffusivity measurements on high purity (99.99% pure) aluminum samples are reported, using chirped and sinusoidally-modulated laser excitation and photopyroelectric detection of the thermal wave response. The results are found to be dependent on the degree of recrystallization of the specimen: for cold-rolled aluminum, the thermal diffusivity is measured to be  =3.10×10–5 m2/s, which rises to 3.88×10–5 m2/s for fully recrystallized samples, and then falls to 3.53×10–5 m2/s for samples exhibiting the initial stages of grain growth. |
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