Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-27T02:03:56.007Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Otsuka, K., Wayman, C. M., Shape Memory Materials, Cambridge Univ. Press, (1999).Google Scholar
2. Dunand, D.C., Mari, D., Bourke, M.A.M., Roberts, J.A., Metallurgical and Materials Transactions, 27A, 2820–2836 (1996).Google Scholar
3. Vaidyanathan, R., Bourke, M.A.M., Dunand, D.C., Journal of Applied Physics A, 86, 6, 3020–3029 (1999).Google Scholar
4. Kulkov, S. N., Mironov, Yu. P., In-Situ Investigations of the Martensitic Transformation in TiNi by Synchrotron Radiation, Transactions of the ASME, Vol. 121, 56–60 (1999).Google Scholar
5. Wanner, A., Dunand, D. C., Synchrotron X-Ray Study of Bulk Lattice Strains in Externally Loaded Cu-Mo Composites, Metallurgical and Materials Transactions A, Volume 31A, Month 2000-2001.Google Scholar
6. Warren, B. E., X-Ray Diffraction, New York: Dover Publications, INC., 21 (1990)Google Scholar
7. Funakubo, H. (ed.), Shape Memory Alloys, Gordon Breach Sci., Pub., NY, 102 (1987).Google Scholar