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Electric Transport Properties of a NiTi Shape Memory Alloy Under Applied Stress.

Published online by Cambridge University Press:  25 February 2011

G. Airoldi ,
G. Riva ,
T. Ranucci  and
B. Vicentini
G. Airoldi
Affiliation:
N.F.H-Dipartimento di Fisica, Universita' di Milano, Via Celoria 16, 20133 Milano, Italy
G. Riva
Affiliation:
N.F.H-Dipartimento di Fisica, Universita' di Milano, Via Celoria 16, 20133 Milano, Italy
T. Ranucci
Affiliation:
I.T.M.-C.N.R.-Area della Ricerca di Milano, Via Bassini 15, 20133 Milano, Italy
B. Vicentini
Affiliation:
I.T.M.-C.N.R.-Area della Ricerca di Milano, Via Bassini 15, 20133 Milano, Italy
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Abstract

It is well known that mechanical properties of Shape Memory Alloys are strongly dependent upon the test temperature (T) respect to transformation temperatures: the stress-strain curves however hinder the true deformation processes acting.

Electrical resistance(ER), a physical property sensibly affected by electronic structure modifications, traditionally used to follow the growth of thermal martensite, is here investigated to follow the modifications of a NiTi alloy, in an initial single phase structure, under applied stress. ER measurements are here detected with the aim to distinguish different deformation processes at four test temperatures Ti (i=1,..,4): in martensitic phase,either at T1 <Mf or at T2<As within the hysteresis cycle; in parent phase, either at Af<T3 or at Ms<T4 within the hysteresis cycle, where T2 = T4. Results are examined in comparison with previous obtained data and discussed at the light of imprinted deformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 277
Copyright
Copyright © Materials Research Society 1992

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