First-principles modeling of the temperature dependence for the superlattice intrinsic stacking fault energies in L12 Ni75-xXxAl25 alloys
Research output: Contribution to journal › Article › peer-review
Colleges, School and Institutes
- UK ATOMIC ENERGY AUTHORITY
Stronger and more resistant alloys are required in order to increase the performance and efficiency of jet engines and gas turbines. This will eventually require planar faults engineering, or a complete understanding of the effects of composition and temperature on the various planar faults that arise as a result of shearing of the γ 0 14 precipitates. In this work, a combined scheme consisting of the density functional theory, the quasi-harmonic Debye model, and the axial Ising model, in conjunction with a quasistatic approach are used to assess the effect of composition and temperature of a series of pseudo-binary alloys based on the (N i75−xXx)Al25 system using distinct relaxation schemes to assess observed differences. Our calculations reveal that the (111) superlattice intrinsic stacking fault energies in these systems decline modestly with temperature between 0 K and 1000 K.
|Journal||Metallurgical and Materials Transactions A|
|Early online date||13 Jul 2018|
|Publication status||E-pub ahead of print - 13 Jul 2018|