An ab initio Investigation of the Effect of Alloying Elements on the Elastic Properties and Magnetic Behavior of Ni₃Al

Abstract

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.

Department(s)

Physics

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

Alloying Elements; Calculations; Defect Density; Defects; Density Functional Theory; Doping (Additives); Elastic Constants; Elastic Moduli; Elasticity; Electronic Structure; Nickel; Quantum Chemistry; Spin Polarization; Ab Initio Investigation; Defect Formation Energies; Elastic Properties; Electronic Density; First-Principles Density Functional Theory; Magnetic Behavior; Ni-Based Superalloys; Spin-Polarized; Aluminum; Bulk Modulus; Defect Formation Energy; Dopants; Ni3Al

International Standard Serial Number (ISSN)

0927-0256

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Elsevier, All rights reserved.

Publication Date

01 Apr 2015

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