First-principles studies of the structural, elastic, electronic and thermal properties of γ′-Ni3Ti

• Published in: Physica. B, Condensed matter Condensed matter, 2013-03, Vol.412, p.45-49
• Main Authors: Cao, Yong, Zhu, Jingchuan, Liu, Yong, Lai, Zhonghong, Nong, Zhisheng
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Elasticity, elastic constants; Electron density of states and band structure of crystalline solids; Electron states; Exact sciences and technology; First principles; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Quasi-harmonic Debye model; Thermal expansion; thermomechanical effects and density; Thermal properties of condensed matter; Thermal properties of crystalline solids; Thermodynamic properties; Transition metals and alloys; γ′-Ni3Ti
• ISSN: 0921-4526; 1873-2135
• DOI: 10.1016/j.physb.2012.12.020

The structural, elastic and electronic properties of ordered face-centered cubic (L12) γ′-Ni3Ti were studied using the projector-augmented-wave (PAW) method within the generalized gradient approximation (GGA). The fact that the elastic constants meet the requirements of mechanical stability for a cubic crystal indicates that γ′-Ni3Ti is mechanically stable at 0K. The bulk modulus, shear modulus, Young's modulus and Poisson's ratio are estimated from the calculated elastic constants of single crystal. The ratio of the bulk modulus to shear modulus (B/G) is 2.00 and the material is ductile. Through the quasi-harmonic Debye model, the pressure and temperature dependences of the linear expansion coefficient, bulk modulus, the Debye temperature and heat capacity have been investigated for the first time.