Atomic diffusion mediated by vacancy defects in pure and transition element (TM)-doped (TM = Ti, Y, Zr or Hf) L1 2 Al 3 Sc
| Autor: | Ya-Ping Wang, Hai-Chen Wang, Jia-Ning Wang, Tao-Tao Shi, Bi-Yu Tang |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Mechanical Engineering Doping Lattice diffusion coefficient Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic diffusion Atomic radius Mechanics of Materials Vacancy defect 0103 physical sciences Atom Physics::Atomic and Molecular Clusters lcsh:TA401-492 Effective diffusion coefficient lcsh:Materials of engineering and construction. Mechanics of materials General Materials Science Diffusion (business) 0210 nano-technology |
| Zdroj: | Materials & Design, Vol 108, Iss, Pp 529-537 (2016) |
| ISSN: | 0264-1275 |
| DOI: | 10.1016/j.matdes.2016.07.008 |
| Popis: | Atomic diffusion in pure and transition element (TM = Ti, Y, Zr or Hf)-doped Al3Sc has been studied mainly along vacancy-mediated diffusion paths. After the point defect formation energies are determined, the energy profiles for dominant diffusion paths are obtained using climbing image nudged elastic band method. The energetic results show that Al atom diffusion through nearest-neighbor jump mediated by Al vacancy is most favorable due to the lowest activation barrier, the other diffusion processes would make very small contribution due to the high activation barrier or unstable final state. The dominant Sc atom diffusion mechanisms are the Al-vacancy mediated nearest-neighbor jump under Al-rich condition and antistructure sublattice mechanism under Sc-rich condition. The 6-jump cycle and next nearest-neighbor jump are greatly restricted with high activation barriers. Moreover, effect of typical transition element (Ti, Y, Zr or Hf) doping on atomic diffusion is further studied. The activation barriers for dominant diffusion mechanisms increase with increasing atom size mismatch in sequence of Zr |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect