First-Principles Modeling of the Temperature Dependence for the Superlattice Intrinsic Stacking Fault Energies in L1$$_2$$ Ni$$_{75-x}$$X$$_x$$Al$$_{25}$$ Alloys
| Autor: | Joshua Allen, Alessandro Mottura, A. Breidi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Superlattice Relaxation (NMR) Metallurgy Metals and Alloys Order (ring theory) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences symbols.namesake Mechanics of Materials 0103 physical sciences symbols Ising model Density functional theory 0210 nano-technology Debye model Quasistatic process Stacking fault |
| Zdroj: | Metallurgical and Materials Transactions A. 49:4167-4172 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-018-4763-4 |
| Popis: | 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 $$\gamma ^\prime $$ precipitates. In the current study, 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 is used to assess the effects of composition and temperature of a series of pseudo-binary alloys based on the $$({\mathrm{Ni}}_{75-x}{\mathrm{X}}_{x}){\mathrm{Al}}_{25}$$ 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. |
| Databáze: | OpenAIRE |
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