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Title: Early-stage decomposition kinetics in Ni-Al alloys -- 1. Small and wide-angle neutron scattering investigation on Ni-13 at.% Al and clusterdynamic modeling

Abstract

The early stages of the formation of ordered {gamma}{prime}-precipitates in Ni-13 at.% Al have been investigated at aging temperatures of 450, 500, and 550 C. Cluster size distributions with radii down to 0.3 nm have been determined by means of small and wide-angle neutron scattering. The observed decomposition kinetics have been analyzed in terms of a clusterdynamic decomposition model that accounts for the low nucleation energy for the formation of ordered precipitates in this alloy. The results of the clusterdynamic modeling of the experimental data reveal that the character of the decomposition reaction depends strongly on the initial supersaturation. A nucleation reaction takes place only at rather low initial supersaturations ({xi}{sub 0} < 1.16). With increasing initial supersaturations, the influence of nucleation diminishes. At higher initial supersaturations ({xi}{sub 0} > 1.35), decomposition proceeds solely by coarsening of an initial distribution of small clusters.

Authors:
;
Publication Date:
Research Org.:
Technische Univ. Clausthal (DE)
OSTI Identifier:
20015224
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 3; Other Information: PBD: 9 Feb 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; AGING; NICKEL ALLOYS; ALUMINIUM ALLOYS; PRECIPITATION; KINETICS; MATHEMATICAL MODELS; NUCLEATION; SCATTERING; NEUTRONS

Citation Formats

Staron, P, and Kampmann, R. Early-stage decomposition kinetics in Ni-Al alloys -- 1. Small and wide-angle neutron scattering investigation on Ni-13 at.% Al and clusterdynamic modeling. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00398-5.
Staron, P, & Kampmann, R. Early-stage decomposition kinetics in Ni-Al alloys -- 1. Small and wide-angle neutron scattering investigation on Ni-13 at.% Al and clusterdynamic modeling. United States. https://doi.org/10.1016/S1359-6454(99)00398-5
Staron, P, and Kampmann, R. 2000. "Early-stage decomposition kinetics in Ni-Al alloys -- 1. Small and wide-angle neutron scattering investigation on Ni-13 at.% Al and clusterdynamic modeling". United States. https://doi.org/10.1016/S1359-6454(99)00398-5.
@article{osti_20015224,
title = {Early-stage decomposition kinetics in Ni-Al alloys -- 1. Small and wide-angle neutron scattering investigation on Ni-13 at.% Al and clusterdynamic modeling},
author = {Staron, P and Kampmann, R},
abstractNote = {The early stages of the formation of ordered {gamma}{prime}-precipitates in Ni-13 at.% Al have been investigated at aging temperatures of 450, 500, and 550 C. Cluster size distributions with radii down to 0.3 nm have been determined by means of small and wide-angle neutron scattering. The observed decomposition kinetics have been analyzed in terms of a clusterdynamic decomposition model that accounts for the low nucleation energy for the formation of ordered precipitates in this alloy. The results of the clusterdynamic modeling of the experimental data reveal that the character of the decomposition reaction depends strongly on the initial supersaturation. A nucleation reaction takes place only at rather low initial supersaturations ({xi}{sub 0} < 1.16). With increasing initial supersaturations, the influence of nucleation diminishes. At higher initial supersaturations ({xi}{sub 0} > 1.35), decomposition proceeds solely by coarsening of an initial distribution of small clusters.},
doi = {10.1016/S1359-6454(99)00398-5},
url = {https://www.osti.gov/biblio/20015224}, journal = {Acta Materialia},
issn = {1359-6454},
number = 3,
volume = 48,
place = {United States},
year = {Wed Feb 09 00:00:00 EST 2000},
month = {Wed Feb 09 00:00:00 EST 2000}
}