Title | Anelastic relaxations in aluminium with ultrafine grain structure |
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Publication Type | Presentazione a Congresso |
Year of Publication | 1996 |
Authors | Bonetti, E., Pasquini L., Sampaolesi E., and Alvisi Marco |
Conference Name | Journal De Physique. IV : JP |
Publisher | EDP Sciences |
Keywords | Aluminum, Anelastic relaxation, Anelasticity spectra, Annealing, Crystal microstructure, Damping, Elastic moduli, Energy dissipation, Grain growth, Grain size and shape, Interfaces (materials), Inverted torsion pendulum, Mechanical attrition, Mechanical variables measurement, Nanostructured materials, Spectroscopy, Vibrating reed technique |
Abstract | The elastic energy dissipation coefficient and dynamic elasticity modulus were measured in the 3-4000 Hz frequency range by an inverted torsion pendulum and a vibrating reed technique on nanocrystalline aluminium samples obtained by mechanical attrition. The anelasticity spectra in the 300-700 K range on as-prepared samples with average grain size in the 20-40 nm range strongly depends on low temperature annealing treatments. A relaxational damping peak Pi at 460 K (3Hz) is observed in samples after thermal annealing without appreciable grain growth. A second peak P2 located at higher temperatures occurs when the grain size exceeds 100 nm. |
URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-3843129217&partnerID=40&md5=92b5bcdba39a6c3bd027c03abf28e37f |
Citation Key | Bonetti1996 |