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Mechanical and thermodynamic properties of intermetallic compounds in the Ni-Ti system.
- Source :
-
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics . 9/10/2017, Vol. 31 Issue 22, p-1. 14p. 6 Charts, 6 Graphs. - Publication Year :
- 2017
-
Abstract
- The mechanical and thermodynamic properties of intermetallic compounds in the Ni-Ti system are studied by first-principles calculations. All phases show anisotropic elasticity in different crystallographic directions, in which Ni3Ti and NiTi2 are approaching the isotropy structure. The elastic moduli and Vicker's hardness of Ni-Ti system intermetallic compounds decrease in the following order: Ni3Ti B2_NiTi B19_NiTi NiTi2, and Ni3Ti shows the best mechanical properties. The intrinsic ductile nature of Ni-Ti compounds is confirmed by the obtained / ratio. The temperature dependence of linear thermal expansion coefficients (LTECs) of the compounds is estimated by the quasi-harmonic approximation (QHA) method. Ni3Ti shows the largest values among all Ni-Ti intermetallic compounds. At room temperature, the LTEC for Ni3Ti is 8.92 × 10 K, which falls in between the LTEC of zirconia toughened alumina (ZTA) (7.0-9.5 × 106 K) and iron matrix (9.2-16.9 × 106 K); i.e., the thermal matching of the ZTA/iron composite will be improved by introducing Ni3Ti intermetallic compound into their interface. Other thermodynamic properties such as sound velocity and Debye temperature are also obtained. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02179792
- Volume :
- 31
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 124993341
- Full Text :
- https://doi.org/10.1142/S0217979217501612