SYMPOSIA PAPER Published: 01 January 1992
STP17971S

Internal Friction Investigation in High-Purity Tantalum and Niobium by Isothermal and Isochronal Measurements

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A new apparatus for acoustic spectroscopy measurement has been built in order to observe the frequency response in tantalum and niobium. It permits the measurement of internal friction, elastic modulus change, and zero-point during a frequency sweep (isothermal damping spectra between 5 and 500 K) or temperature sweep (isochronal damping spectra between 10-4 and 10 Hz). It was possible to identify three interesting phenomena by the capability, offered by this new installation, of working isothermally in a low temperature range: (1) annealing of the gamma peak during a frequency sweep; (2) a strong temperature dependence of the Snoek-Köster peak's activation energy; and (3) activation of the {112} slipplane in an intermediate temperature range for screw dislocations.

Author Information

D'Anna, G
Institut de Génie Atomique, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
Benoit, W
Institut de Génie Atomique, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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Details
Developed by Committee: E28
Pages: 358–370
DOI: 10.1520/STP17971S
ISBN-EB: 978-0-8031-5218-2
ISBN-13: 978-0-8031-1495-1