High-temperature superelasticity and the shape-memory effect in [001] Co-Ni-Al single crystals

verfasst von

Yu I. Chumlyakov, E. Yu Panchenko, A. V. Ovsyannikov, S. A. Chusov, V. A. Kirillov, I. Karaman, H. Maier

Abstract

Development of thermoelastic B2-Ll₀ martensitic transformations (MT_s) has been investigated upon cooling/heating and under stress using single crystals of Co₄₀Ni₃₃Al₂₇ and Co₃₅Ni₃₅Al₃₀ (at %), oriented along the [001] direction. It is shown that the temperature intervals of the development of superelasticity T _SE and the values of the mechanical (Δσ) and temperature (ΔT) hysteresis are determined by the chemical composition of crystals and the type of deformation (tension or compression) along the longitudinal axis [001]. The effect of the phase and dispersed particles on the development of martensitic transitions, the mechanical stabilization of the stress-induced martensite, and the temperature interval of superelasticity †T _SE has been investigated. Conditions necessary for the development of high-temperature superelasticity (at T = 570-580 K) have been determined and a thermodynamic description of the temperature interval of superelasticity has been suggested.

Externe Organisation(en)

Tomsk State University
Texas A and M University
Universität Paderborn

Typ

Artikel

Journal

Physics of Metals and Metallography

Band

107

Seiten

194-205

Anzahl der Seiten

12

ISSN

0031-918X

Publikationsdatum

02.2009

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Physik der kondensierten Materie, Werkstoffchemie

Elektronische Version(en)

https://doi.org/10.1134/S0031918X09020124 (Zugang: Unbekannt)