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Title: In-situ X-ray diffraction study of diffusion-controlled coarsening kinetics in an Ni-Si alloy. [Ni-12. 5 at% Si]

Abstract

In-situ high temperature x-ray diffraction experiments have been performed on bulk Ni-12.5at%Si alloy single crystals in order to study the growth behavior of {gamma}{prime} precipitates from a disordered, supersaturated solid solution, and to test the Lifshitz-Slyozov-Wagner (LSW) theory of diffusion-controlled coarsening kinetics. The integrated intensity and the line width of superlattice reflections representative of the {gamma}{prime} phase were continuously monitored with time at 400 C, 450 C, 500 C and 550 C. Results show that the precipitate is generally spherical in shape and particle size follows the t{sup 1/3} growth behavior. Furthermore, the growth in volume fraction obeys an exponential relationship. All of the above observations are consistent with the LSW model. Subsequent analysis based upon this model yielded interdiffusion coefficient which is in good agreement with other data obtained at higher temperatures using different techniques.

Authors:
; ;  [1]
  1. Univ. of Illinois, Urbana (USA)
OSTI Identifier:
5451447
Report Number(s):
CONF-840909-
Journal ID: ISSN 0197-1689; CODEN: TMPSA
Resource Type:
Conference
Journal Name:
TMS (The Metallurgical Society) Paper Selection; (USA)
Additional Journal Information:
Journal Volume: 56; Conference: TMS-AIME fall meeting, Detroit, MI (USA), 16-20 Sep 1984; Journal ID: ISSN 0197-1689
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL BASE ALLOYS; MICROSTRUCTURE; SILICON ALLOYS; CRYSTAL STRUCTURE; DIFFUSION; KINETICS; MATHEMATICAL MODELS; PARTICLE SIZE; PRECIPITATION; SHAPE; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; ALLOYS; COHERENT SCATTERING; DIFFRACTION; NICKEL ALLOYS; SCATTERING; SEPARATION PROCESSES; SIZE; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Polat, S, Dvorack, M A, and Chen, H. In-situ X-ray diffraction study of diffusion-controlled coarsening kinetics in an Ni-Si alloy. [Ni-12. 5 at% Si]. United States: N. p., Web.
Polat, S, Dvorack, M A, & Chen, H. In-situ X-ray diffraction study of diffusion-controlled coarsening kinetics in an Ni-Si alloy. [Ni-12. 5 at% Si]. United States.
Polat, S, Dvorack, M A, and Chen, H. . "In-situ X-ray diffraction study of diffusion-controlled coarsening kinetics in an Ni-Si alloy. [Ni-12. 5 at% Si]". United States.
@article{osti_5451447,
title = {In-situ X-ray diffraction study of diffusion-controlled coarsening kinetics in an Ni-Si alloy. [Ni-12. 5 at% Si]},
author = {Polat, S and Dvorack, M A and Chen, H},
abstractNote = {In-situ high temperature x-ray diffraction experiments have been performed on bulk Ni-12.5at%Si alloy single crystals in order to study the growth behavior of {gamma}{prime} precipitates from a disordered, supersaturated solid solution, and to test the Lifshitz-Slyozov-Wagner (LSW) theory of diffusion-controlled coarsening kinetics. The integrated intensity and the line width of superlattice reflections representative of the {gamma}{prime} phase were continuously monitored with time at 400 C, 450 C, 500 C and 550 C. Results show that the precipitate is generally spherical in shape and particle size follows the t{sup 1/3} growth behavior. Furthermore, the growth in volume fraction obeys an exponential relationship. All of the above observations are consistent with the LSW model. Subsequent analysis based upon this model yielded interdiffusion coefficient which is in good agreement with other data obtained at higher temperatures using different techniques.},
doi = {},
url = {https://www.osti.gov/biblio/5451447}, journal = {TMS (The Metallurgical Society) Paper Selection; (USA)},
issn = {0197-1689},
number = ,
volume = 56,
place = {United States},
year = {},
month = {}
}

Conference:
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