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Evolution of the R-Phase Transformation Temperature of Ti50Ni50-xFex Shape Memory Alloys with Iron Concentration

Published online by Cambridge University Press:  16 February 2011

R GÓmez ,
V. Marquina ,
R. Ridaura ,
M.L. Marquina ,
M. JimÉnez ,
S. Aburto ,
R. Escudero ,
F. Morales ,
D. Rios-Jara  and
A. Canales
R GÓmez
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México D.F., México
V. Marquina
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México D.F., México
R. Ridaura
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México D.F., México
M.L. Marquina
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México D.F., México
M. JimÉnez
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México D.F., México
S. Aburto
Affiliation:
Facultad de Ciencias, Universidad Nacional Autónoma de México, 04510 México D.F., México
R. Escudero
Affiliation:
Instituto de lnvestigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 México D.F., México
F. Morales
Affiliation:
Instituto de lnvestigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 México D.F., México
D. Rios-Jara
Affiliation:
Instituto de lnvestigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 México D.F., México
A. Canales
Affiliation:
Instituto de lnvestigaciones en Materiales, Universidad Nacional Autónoma de México, 04510 México D.F., México
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Abstract

The evolution of the R-phase transformation temperature with iron concentration is studied by Mössbauer spectroscopy (MS), magnetic susceptibility and calorimetric measurements in a series of three Ti50Ni50-xFex, samples, with x = 1, 2 and 3. The changes in the Mössbauer spectra, from a single line at room temperature to a quadrupole doublet when the temperature is lowered below 280 K, are related to structural transformations occurring in the system. The temperature changes in the magnetic susceptibility are interpreted in terms of a gap opening characteristic of charge density waves (CDW) formation when the R-phase transformation takes place. The calorimetric measurements show specific heat fluctuations near room temperature in two of the samples (x = 1 and 3) whose peaks shift during the cooling and heating cycles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 360 , 1994 , 489
Copyright
Copyright © Materials Research Society 1995

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References

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