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Interplay between temperature and composition effects on the martensitic transformation in Ni2+xMn1-xGa alloys.
- Source :
-
Applied Physics Letters . 6/27/2011, Vol. 98 Issue 26, p261903. 3p. 1 Chart, 2 Graphs. - Publication Year :
- 2011
-
Abstract
- Martensitic transformation in Ni2+xMn1-xGa alloys is known to be controlled by the soft tetragonal elastic constant C′ of the high-temperature austenitic phase. The temperature (T) and composition (x) dependence of C′(T, x) are calculated using the first-principles exact muffin-tin orbitals method. We show that the temperature factor of C′ is dominated by the phonon-smearing term. The competition between the negative alloying effect (∂C′/∂x < 0) and the positive temperature effect (∂C′/∂T > 0) is found to lead to nearly constant C′(TM(x), x) at the critical temperature TM(x). We demonstrate that a proper account of the temperature and composition dependence of C′(T, x) is indispensable for reasonable theoretical TM(x) values. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 98
- Issue :
- 26
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 62219157
- Full Text :
- https://doi.org/10.1063/1.3603935