Stability of the B2-Type Structure of Ti-Ni-Fe and Ti-Ni-Co Shape Memory Alloys

Abstract:

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Change in the R-phase transformation behavior with the increase of Fe/Co content in Ti-(50-x)Ni-xFe and Ti-(50-x)Ni-xCo alloys has been investigated through thermal property measurements and microscope observations in order to clarify the relation among the stability of the B2-type structure, premartensitic phenomena, and the R-phase transformation. It was found that with increasing Fe/Co content, the R-phase transformation behavior approaches a second-order like one. The transformation product formed very close to the second-order is composed of nanoscale domains, and its Debye temperature is low compared with the R-phase formed by obvious first-order transformation.

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Periodical:

Edited by:

Yukichi Umakoshi and Shinji Fujimoto

Pages:

233-238

DOI:

10.4028/www.scientific.net/MSF.512.233

Citation:

M. S. Choi et al., "Stability of the B2-Type Structure of Ti-Ni-Fe and Ti-Ni-Co Shape Memory Alloys", Materials Science Forum, Vol. 512, pp. 233-238, 2006

Online since:

April 2006

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$35.00

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