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

authored by

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.

External Organisation(s)

Tomsk State University
Texas A and M University
Paderborn University

Type

Article

Journal

Physics of Metals and Metallography

Volume

107

Pages

194-205

No. of pages

12

ISSN

0031-918X

Publication date

02.2009

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Condensed Matter Physics, Materials Chemistry

Electronic version(s)

https://doi.org/10.1134/S0031918X09020124 (Access: Unknown)