Paper Title:
Directional Diffusion and Effect Factors of the Elements during Creep of Nickel-Base Single Crystal Superalloys
  Abstract

By means of the calculation of the elements diffusion mobility, an investigation has been made into the influence of the elements interaction on the rates of the elements diffusion and  phase directional coarsening during creep of single crystal superalloys. Results show that the elements diffusion and  phase directional coarsening during creep are related to the applied stressed and elastic modulus. And the rate of  phase directional coarsening is enhanced with the applied stresses. Due to the interaction between the elements, the rates of the elements diffusion and  phase directional coarsening decrease with the increment of the elements Ta+Mo gross and Ta/W ratio. In the diffusion field of the elements during creep, the Al, Ta atoms with bigger radius are diffused to {100} planes to form the N-type rafted structure along the direction vertical to the applied stress axis, and the change of the strain energy density in the interfaces of the cubic  phase is thougth to be the driving force of the elements diffusion.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
2339-2344
DOI
10.4028/www.scientific.net/MSF.638-642.2339
Citation
S. G. Tian, M. G. Wang, X. F. Yu, X. D. Lu, B. J. Qian, "Directional Diffusion and Effect Factors of the Elements during Creep of Nickel-Base Single Crystal Superalloys", Materials Science Forum, Vols. 638-642, pp. 2339-2344, 2010
Online since
January 2010
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