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Atomic mobilities and diffusivities in the fcc, L12 and B2 phases of the Ni-Al system

  • Lijun Zhang , Yong Du , Qing Chen , Ingo Steinbach and Baiyun Huang
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 12

Abstract

A phenomenological model was utilized to describe diffusivities in the γ (fcc) /γü (L12) and A2/B2 phases of the NiüAl system. An effective strategy, which takes the homogeneity range and defect concentration into account, was developed in the present work to optimize the atomic mobilities of γü phase. Such a strategy results in a dramatic decrease in the number of atomic mobility parameters to be evaluated for the L12 phase. The measured composition- and temperature- dependent diffusivities in the NiüAl system have been well replicated by the present mobility descriptions. For the L12 phase, comprehensive comparisons show that with fewer model parameters the presently obtained mobilities yield a better fit to experimental diffusivities, compared with previous assessments. The mobility descriptions are further validated by comparing calculated and measured concentration profiles for various diffusion couples. The time-dependent Al composition profile for the annealed vapor Al / γ couple is accurately described for the first time.

Keywords: Ni-Al system; Diffusion; Atomic mobility; Order/disorder phenomena; DICTRA
* Correspondence address, Professor Dr. Yong Du, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P. R. China. Tel.: +86 731 8883 6213, Fax: +86 731 8871 0855. E-mail:

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Received: 2009-9-9
Accepted: 2010-9-10
Published Online: 2013-06-11
Published in Print: 2010-12-01

© 2010, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110428
Keywords for this article
Ni-Al system; Diffusion; Atomic mobility; Order/disorder phenomena; DICTRA

Articles in the same Issue

  1. Basic
  2. High-temperature in-situ microscopy during stress-induced phase transformations in Co49Ni21Ga30 shape memory alloy single crystals
  3. Contents
  4. contents
  5. Editorial
  6. Editorial December 2010
  7. Basic
  8. Atomic mobilities and diffusivities in the fcc, L12 and B2 phases of the Ni-Al system
  9. Experimental investigation of the Zn–Fe–V system at 450°C
  10. Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al–Cu–Ag alloys
  11. Reassessment of the Mg–Ge binary system using CALPHAD supported by first-principles calculation
  12. A quantitative modeling of the unloading behavior of metals during a tensile test
  13. A technique for diameter enlargement in SiC crystal growth
  14. Applied
  15. Thermal and chemical stability of Cr2AlC in contact with α-Al2O3 and NiAl
  16. Microstructure and mechanical properties of Zn25Al3Cu based composites with large Al2O3 particles at room and elevated temperatures
  17. An investigation on Incoloy800-SS304 clad plate by explosive welding
  18. Effect of grain boundary precipitates on vibration damping of FeüCrüMgüAl/Si alloy
  19. Adsorption of metal ions on magnetic carbon nanomaterials bearing chitosan-functionalized silica
  20. Tensile and in-vitro degradation study of electro spun fibrous mat produced from eri silk fibroin
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