Thema: NiTi-Legierung, Formgedächtniseffekt
Autor/Institution: Kato, H.;Ohuchi, T.;Tomizawa, T.;Yoshikawa, K. /Saitama Univ., J

Title: Ultrasonic characterization of shape memory effect of NiTi alloys
Titel : Ultraschall-Charakterisierung des Formgedächtniseffekts von NiTi- Legierungen

Quelle : Nondestructive Testing and Stress-Strain Measurement, FENDT '92. Vol. 1. Nondestructive Testing. Proceedings of International Symposium, Tokyo, J, October 12-14, 1992 1992 ; Tokyo: JSNDI ; ISBN 4-931018-02-5 ; S.307-312 ; 6S,10B,2T,5Q ; BAM-Z-1335/94 ; E

Abstract:

The ultrasonic measurement and the X-ray diffraction analysis were carried out on NiTi alloys with different microstructures under tensile deformation. Plates of NiTi alloy (55,28 wt% Ni and 44,72 wt% Ti) were heated to 400 deg C or 600 deg C for 1 hour and quenched in water. The specimen being heat-treated at 400 deg C consisted of the martensite phase and the intermediate phases. The ultrasonic velocity increased with the strain, which was explained by alignment of martensite following the twin deformation. The specimen being heat-treated at 600 deg C consisted of the martensitic phase and the high-temperature phase. The velocity increased with the strain, then decreased in the strain range between 0.25 % and 0.4 %. At a strain more than 0.4 %, the velocity slowly decreased and converged to a value. The intensity of the X-ray diffracted from the high- temperature phase also decreased with the strain at strains more than 0.25 %. The decrease of the velocity at strains above 0.25 % was explained by the stress induced martensitic transformation. F33,B13

Database Keywords: Zerstörungsfreie Prüfung, Akustisches Messen, Röntgenanalyse, R"ntgenbeugung, Nickellegierung, Mikrogefüge, Zugversuch, Wärmebehandlung, Martensit, Schallgeschwindigkeit, Zwillingsbildung, Dehnung, Formgedächtnislegierung, Phasenumwandlung, Formgedächtniseffekt, Spannungs Dehnungsdiagramm 23 Nickel-Titan-Legierung 27 Alloy2 Ni Ti

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