Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.\%Ni) under extensional load with synchrotron radiation

Schmahl, Wolfgang W.; Khalil-Allafi, Jafar; Hasse, B.; Wagner, M.; Heckmann, A. and Somsen, C. (2004): Investigation of the phase evolution in a super-elastic NiTi shape memory alloy (50.7 at.\%Ni) under extensional load with synchrotron radiation. In: Materials Science and Engineering A, Vol. 378, No. 1-2 SPEC. ISS: pp. 81-85

Abstract

Inhomogeneous strain distribution associated with stress induced transformation and shear-band formation in super-elastic NiTi is investigated by diffraction with synchrotron radiation and diffraction imaging. We observe a large displacement of the austenite (1 1 0) diffraction peak as a function of tensile strain. This indicates a significant load transfer on residual austenite grains within the martensite matrix of a Lüders-like shear transformation band. A distinct stress state occurs at the interface between the shear-band and the surrounding austenite.

• Item Type: Journal article
• Faculties: Geosciences > Department of Earth and Environmental Sciences > Crystallography and Materials Science
• Subjects: 500 Science > 550 Earth sciences and geology
• Language: English