Open Access
Article Number 02036
Number of page(s) 5
Section Principles, Simulations, Materials: Background
Published online 01 September 2009
ESOMAT 2009, 02036 (2009)
DOI: 10.1051/esomat/200902036

In-situ TEM study of stress-induced transformations in CuAlNi

N. Zárubová, J. Gemperlová, A. Gemperle and Z. Dlabáček

Institute of Physics, ASCR v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic

Published online: 1 September 2009

Stress-induced martensitic transformations and twinning processes were studied in thin foils of CuAlNi single crystals strained in-situ in a transmission electron microscope. A detailed structure analysis comprised identification of phases existing under stress and determination of their mutual crystallographic orientation. Three transformation processes were detected: i) transformation of austenite into 2H martensite at low stress levels; ii) twinning/detwinning processes in 2H martensite, and iii) transformation between austenite and 18R martensite at higher stress levels. Nucleation and growth of martensite plates were followed, and morphology of the austenite/martensite habit planes was examined. Existence of planar interfaces between a single variant of 2H martensite and austenite on microscopic level was proved.

© Owned by the authors, published by EDP Sciences 2009