INTERNAL FRICTION ASSOCIATED WITH THE ALLOTROPIC TRANSFORMATION OF COBALTReport as inadecuate




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Abstract : Measurements of internal friction have been performed in highpurity cobalt in the temperature range of the allotropic hcp-fcc transformation. At low frequency ~ 1 Hz, an important peak is observed which is due to a transitory effect. This peak, actually, disappears under isothermal conditions. At high frequency ~ 5 kHz, the transitory term is absent and a discontinuous change of internal friction occurs during the transformation. Moreover during heating, a little internal friction peak and a frequency dip are observed, which are probably connected with the phase transformation. These features are similar to those observed for other martensitic transformations.





Author: J. Bidaux R. Schaller W. Benoit

Source: https://hal.archives-ouvertes.fr/



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