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Title: Permeation of nitrogen in solid nickel and deformation phenomena accompanying internal nitridation

Abstract

Internal nitridation of Ni alloys containing 5 at.% Cr or 1.5 at.% Ti was studied over the range of 600--700 C in a flowing NH{sub 3} + H{sub 2}-gas mixture. Growth rate of the nitrided zone was found to obey a parabolic law and the nitrogen uptake by the sample is controlled by the nitrogen diffusion in the metal. It was demonstrated that under the experimental conditions used, a classical Wagner`s treatment of the internal precipitation can be applied to describe the nitridation kinetics and obtain permeability constants. Permeability of nickel for nitrogen at the standard pressure of 1 bar was determined to be: N{sub N}{sup {Theta}}{center_dot}D{sub N} = 3.1 {times} 10{sup {minus}11}exp({minus}17,500/T) [m{sup 2}/s]. A volume change associated with the precipitation reaction resulted in a stress gradient between the alloy`s surface and the internal nitridation front. It was observed that stress relief occurred mainly by transport of nickel (solvent metal) to the gas/metal interface. Pipe diffusion-controlled creep was shown to be the dominant stress accommodation mechanism. This mechanism is prevailing because of a large dislocation density generated in the Ni matrix upon the internal precipitation of the semi-coherent nitride particles.

Authors:
; ; ;  [1];  [2]
  1. Eindhoven Univ. of Technology (Netherlands). Lab. of Solid State and Materials Chemistry
  2. Kossuth Lajos Univ., Debrecen (Hungary). Dept. of Solid State Physics
Publication Date:
OSTI Identifier:
684377
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 47; Journal Issue: 11; Other Information: PBD: 8 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOM TRANSPORT; NITRIDATION; NICKEL ALLOYS; AMMONIA; HYDROGEN; DEFORMATION; TEMPERATURE RANGE 0400-1000 K; PRECIPITATION; KINETICS; DISLOCATIONS

Citation Formats

Kodentsov, A.A., Van Dal, M.J.H., Cserhati, C., Van Loo, F.J.J., and Daroczi, L. Permeation of nitrogen in solid nickel and deformation phenomena accompanying internal nitridation. United States: N. p., 1999. Web. doi:10.1016/S1359-6454(99)00194-9.
Kodentsov, A.A., Van Dal, M.J.H., Cserhati, C., Van Loo, F.J.J., & Daroczi, L. Permeation of nitrogen in solid nickel and deformation phenomena accompanying internal nitridation. United States. doi:10.1016/S1359-6454(99)00194-9.
Kodentsov, A.A., Van Dal, M.J.H., Cserhati, C., Van Loo, F.J.J., and Daroczi, L. Wed . "Permeation of nitrogen in solid nickel and deformation phenomena accompanying internal nitridation". United States. doi:10.1016/S1359-6454(99)00194-9.
@article{osti_684377,
title = {Permeation of nitrogen in solid nickel and deformation phenomena accompanying internal nitridation},
author = {Kodentsov, A.A. and Van Dal, M.J.H. and Cserhati, C. and Van Loo, F.J.J. and Daroczi, L.},
abstractNote = {Internal nitridation of Ni alloys containing 5 at.% Cr or 1.5 at.% Ti was studied over the range of 600--700 C in a flowing NH{sub 3} + H{sub 2}-gas mixture. Growth rate of the nitrided zone was found to obey a parabolic law and the nitrogen uptake by the sample is controlled by the nitrogen diffusion in the metal. It was demonstrated that under the experimental conditions used, a classical Wagner`s treatment of the internal precipitation can be applied to describe the nitridation kinetics and obtain permeability constants. Permeability of nickel for nitrogen at the standard pressure of 1 bar was determined to be: N{sub N}{sup {Theta}}{center_dot}D{sub N} = 3.1 {times} 10{sup {minus}11}exp({minus}17,500/T) [m{sup 2}/s]. A volume change associated with the precipitation reaction resulted in a stress gradient between the alloy`s surface and the internal nitridation front. It was observed that stress relief occurred mainly by transport of nickel (solvent metal) to the gas/metal interface. Pipe diffusion-controlled creep was shown to be the dominant stress accommodation mechanism. This mechanism is prevailing because of a large dislocation density generated in the Ni matrix upon the internal precipitation of the semi-coherent nitride particles.},
doi = {10.1016/S1359-6454(99)00194-9},
journal = {Acta Materialia},
number = 11,
volume = 47,
place = {United States},
year = {1999},
month = {9}
}