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Electron-irradiation-induced Changes of martensitic transformation characteristics in TiNi shape memory alloys

Published online by Cambridge University Press:  01 February 2011

X. T. Zu ,
L.P. You ,
S. Zhu ,
Z. G. Wang ,
J. H. Wu  and
L. M. Wang
X. T. Zu*
Affiliation:
Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China
L.P. You
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
S. Zhu
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
Z. G. Wang
Affiliation:
Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China
J. H. Wu
Affiliation:
Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu, 610054, P. R. China
L. M. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
*
* Electronic mail: zuxt@sohu.com. Fax & Tel: 86 28 83201939
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Abstract

TiNi shape memory alloy samples were irradiated within R-phase by 1.7 MeV electrons with different doses. The martensitic transformation temperatures were measured by Differential Scanning Calorimeter (DSC). The results indicated that the temperature Ms of the onset of R-phase-to-martensite transformation decreased with increasing the dose. The electron irradiation had a slight effect on the other transformation temperatures. The second lifetime of positrons determined by Positron Annihilation Technology were lowered with an increment of the irradiated dose. Relaxation of the elastic stress fields around the Ti3Ni4 precipitates was the cause of the observed change of the transformation characteristics because of the migration and accumulation of electron irradiation-induced point defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 792: Symposium R – Radiation Effects and Ion Beam Processing of Materials , 2003 , R3.28
Copyright
Copyright © Materials Research Society 2004

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