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On the Electronic Nature of Phase Transformations in Ti-Me Shape Memory Compounds

Published online by Cambridge University Press:  25 February 2011

S. A. Shabalovskaya
S. A. Shabalovskaya*
Affiliation:
V. D. Kuznetsov Physical-Technical Institute, Tomsk 634050, U.S.S.R
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Abstract

Binary or quasi-binary compounds TI-Me (where Me stands for Fe, Co, Ni, Pd. Pt and Au, or Ni with one of the above metals) with the B2 (CsCl) structure are known to undergo martensitic transformations of two types: B2-B19'(B19) and B2-R, with an Intermediate precursor charge-density-wave Incommensurate phase IS. Analysis of both experimental and theoretical data enabled us to establish empirical relations between the transformation temperatures: Ms(B2-B19') and TIs(B2-1S), and fundamental parameters of both electronic and crystal structures of the compounds, such as the lattice parameters, the shift of the d-band in the compound with respect to that in the pure Me, the compound's d-band width, the Ti site-projected d-densities of states at the Fermi level In the compound and BCC Ti, and the temperature of β-β allotropic transformation In pure Ti. This correlation is based on localization of the Me d-bands in the compounds. As a result the Me-Me interaction becomes less important, and the interatomic interactions are controlled by d-d (Ti-Ti) and sp-d (Me-Ti) bonds. The Fermi levels are dominated by the Ti d-states, which control the lattice dynamics as well. The latter is also reflected in closeness of the C' moduli and similar values of the phonon frequencies In Ti and the TiNi compound. Since the intermediate IS phase results from a frozen phonon mode and Is controlled by the electron-phonon interaction, the B2-IS transition temperature can be correlated with the Debye Temperature, θD as: TIS=λθD. Estimates based on experimental data show that for Ti-Ni alloys λ < 1.3. A decrease of λ upon alloying with Fe stabilizes the B2 phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 247
Copyright
Copyright © Materials Research Society 1992

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