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

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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.

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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 et al., "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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$35.00

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