An ab initio investigation of the effect of alloying elements on the elastic properties and magnetic behavior of Ni3Al

作者：Kumar Aakash; Chernatynskiy Aleksandr; Hong Minki; Phillpot Simon R; Sinnott Susan B^*

来源：Computational Materials Science, 2015, 101: 39-46.

DOI：10.1016/j.commatsci.2015.01.007

• Density functional theory
• Ni-based superalloys
• Ni3Al
• Dopants
• Defect formation energy
• Elastic constants
• Bulk modulus

First principles density functional theory calculations were performed on pure and doped Ni3Al. The dopants investigated were Cr, Zr, La and Ce at concentrations of 3.13, 6.25 and 9.38 at.%, and B was considered at concentrations of 3.03, 5.88 and 8.57 at.%. The defect formation energies, doping site preferences, and elastic properties of pure and doped Ni3Al were determined and compared to published theoretical and experimental results. The magnetic properties of Ni3Al and, where appropriate, the dopants, were always taken into account, as the elastic constants predicted from spin-polarized and non-spin-polarized calculations were significantly different. The results were successfully correlated to the electronic structure through the electronic density using Miedema's established model (Miedema et al., 1973). The calculations revealed that Cr doping increases the bulk modulus of Ni3Al and that all the other dopants considered decrease it.

• 出版日期2015-4-15