Title

Elastic modulus of shape-memory NiTi from in situ neutron diffraction during macroscopic loading, instrumented indentation, and extensometryl

Authors

Authors

S. Rajagopalan; A. L. Little; M. A. M. Bourke;R. Vaidyanathan

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

SUPERELASTIC NITI; TIC COMPOSITES; ALLOYS; Physics, Applied

Abstract

The elastic modulus of B19' shape-memory NiTi was determined using three techniques; from the response of lattice planes measured using in situ neutron diffraction during loading, instrumented indentation using a spherical indenter and macroscopic extensometry. The macroscopic measurements resulted in a modulus of 68 GPa, significantly less than the 101 GPa from indentation and the lattice plane average of 109 GPa from neutron diffraction. Evidence from the neutron measurements suggests that the disparity derives from the onset of small amounts of twinning at stresses less that 40 MPa, which might otherwise be considered elastic from a macroscopic view point. (c) 2005 American Institute of Physics.

Journal Title

Applied Physics Letters

Volume

86

Issue/Number

8

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

3

WOS Identifier

WOS:000227609000015

ISSN

0003-6951

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