Diffusional phase transformations on the atomic scale: Experiment and modeling

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In the early stages of phase transformations, microstructures are generated with the dimensions of only a few atomic spacings. Investigation of structures on such a fine scale poses severe difficulties, not only for experimental studies, but also for conventional theories based on continuum models. In this paper the authors report on a combination of atomic-scale microanalysis using the position-sensitive atom probe and atomistic simulations using the dynamic Ising model. Three phase transformations have been studied: spinodal decomposition in Fe-Cr alloys, nucleation and growth in dilute Cu-Co alloys and finally a conditional spinodal reaction in Ti-Al. The model provided a good ... continued below

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22 p.

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Hyde, J.M.; Cerezo, A.; Setna, R.P.; Smith, G.D.W. & Miller, M.K. December 31, 1995.

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Description

In the early stages of phase transformations, microstructures are generated with the dimensions of only a few atomic spacings. Investigation of structures on such a fine scale poses severe difficulties, not only for experimental studies, but also for conventional theories based on continuum models. In this paper the authors report on a combination of atomic-scale microanalysis using the position-sensitive atom probe and atomistic simulations using the dynamic Ising model. Three phase transformations have been studied: spinodal decomposition in Fe-Cr alloys, nucleation and growth in dilute Cu-Co alloys and finally a conditional spinodal reaction in Ti-Al. The model provided a good quantitative match to the kinetics of spinodal decomposition observed in Fe-45%Cr, and nucleation and growth in Cu-1%Co. It also predicts the development of coupled ordering and phase separation in Ti-15%Al.

Physical Description

22 p.

Notes

OSTI as DE96005479

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  • Materials Week `95, Cleveland, OH (United States), 29 Oct - 2 Nov 1995

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  • Other: DE96005479
  • Report No.: CONF-951026--7
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/195731 | External Link
  • Office of Scientific & Technical Information Report Number: 195731
  • Archival Resource Key: ark:/67531/metadc664165

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Creation Date

  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • June 27, 2016, 12:48 p.m.

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Hyde, J.M.; Cerezo, A.; Setna, R.P.; Smith, G.D.W. & Miller, M.K. Diffusional phase transformations on the atomic scale: Experiment and modeling, report, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc664165/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.