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Synchrotron X-Ray Study of Texture in Cold-Worked Shape-Memory NiTi-Wires

Published online by Cambridge University Press:  21 March 2011

Andreas Schuster ,
Heinz Voggenreiter ,
Dorian K. Balch  and
David C. Dunand
Andreas Schuster
Affiliation:
EADS, Corporate Research Center, 81663 Munich, Germany
Heinz Voggenreiter
Affiliation:
EADS, Corporate Research Center, 81663 Munich, Germany
Dorian K. Balch
Affiliation:
Northwestern University, Dept. of Materials Science and Engineering, Evanston IL 60208, USA
David C. Dunand
Affiliation:
Northwestern University, Dept. of Materials Science and Engineering, Evanston IL 60208, USA
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Abstract

A series of martensitic, near-equiatomic NiTi shape-memory alloy wires was deformed to strains ranging from 1 to 40% up to stresses of 920 MPa. After deformation, the wires were exposed to a monochromatic, parallel beam of high energy x-rays oriented perpendicular to the wire axis. The transmitted low index diffraction rings show that martensitic texture is increasing with prestrain up to ε=15% after twinning is complete. Further prestraining in the plastic range lowers the texture again indicating that twinning- and plasticity-textures cancel partially each other. Also, deformed NiTi-wires were heated and cooled from 20°C to 200°C under a small constant stress of 6 MPa. The strain change due to the Two-Way Shape-Memory Effect was measured and correlated to the diffraction results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 678: Symposia EE – Applications of Synchrotron Radiation Techniques…IV , 2001 , EE2.6.1
Copyright
Copyright © Materials Research Society 2001

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