Low frequency internal friction of Hydrogen-free and Hydrogen-doped NiTi alloys (Articolo in rivista)

Type
Label
  • Low frequency internal friction of Hydrogen-free and Hydrogen-doped NiTi alloys (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.actamat.2007.03.020 (literal)
Alternative label
  • F.M. Mazzolai; A Biscarini; B. Coluzzi; G. Mazzolai; E. Villa; A. Tuissi (2007)
    Low frequency internal friction of Hydrogen-free and Hydrogen-doped NiTi alloys
    in Acta materialia
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F.M. Mazzolai; A Biscarini; B. Coluzzi; G. Mazzolai; E. Villa; A. Tuissi (literal)
Pagina inizio
  • 4243 (literal)
Pagina fine
  • 4252 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 55 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Perugia, Department of Physics, Via A. Pascoli 5, 06123 Perugia, Italy Istituto per l'Energetica e le Interfasi, CNR-IENI, C.so Promessi Sposi 29, 29300 Lecco, Italy (literal)
Titolo
  • Low frequency internal friction of Hydrogen-free and Hydrogen-doped NiTi alloys (literal)
Abstract
  • The internal friction (IF) and Young's modulus of the Ni50.8Ti49.2 shape memory alloy have been measured as a function of temperature (130 K < T < 335 K) by a dynamic mechanical analyser at various strain amplitudes and frequencies. Besides the one associated with the austenite/martensite transformation, several other IF peaks have been observed both in the hydrogen-free and in the hydrogen-doped states of the material. Some of these peaks are non-thermally activated processes caused by stress-assisted hysteretic motions of twin boundaries and dislocations; some others represent thermally activated relaxations caused by reorientation of hydrogen elastic dipoles or by stress-induced motions of twin boundaries interacting with hydrogen. The present low-frequency measurements provide new information concerning the amplitude and frequency dependences of the damping processes, thus throwing new light on their structural mechanisms. (literal)
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