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Title: Determining the Nanoscale Chemistry and Behavior of Solid-Liquid Systems

Abstract

Many fundamental questions in crystal-growth behavior remain unanswered because of the difficulties encountered in simultaneously observing phases and determining elemental concentrations and redistributions while crystals nucleate and grow at the nanoscale. We show that these obstacles can be overcome by performing energy-dispersive x-ray spectroscopy on partially molten Al-Si-Cu-Mg alloy particles during in situ heating in a transmission electron microscope. Using this technique, we were able to (i) determine that the aluminum and silicon concentrations change in a complementary and symmetric manner about the solid-liquid interface as a function of temperature; (ii) directly measure the solid- and liquid-phase compositions at equilibrium and in highly undercooled conditions for quantitative comparison with thermodynamic calculations of the liquidus and solidus phase boundaries; and (iii) provide direct evidence for homogeneous nucleation of the aluminum-rich solid.

Authors:
 [1];  [1];  [2]
  1. University of Virginia
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
930943
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Science; Journal Volume: 318
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; SILICON ALLOYS; COPPER ALLOYS; MAGNESIUM ALLOYS; CRYSTAL GROWTH; ON-LINE MEASUREMENT SYSTEMS; NUCLEATION; THERMODYNAMICS; PHASE STUDIES

Citation Formats

Eswaramoorthy, Santhana, Howe, Prof. James M, and Muralidharan, Govindarajan. Determining the Nanoscale Chemistry and Behavior of Solid-Liquid Systems. United States: N. p., 2007. Web. doi:10.1126/science.1146511.
Eswaramoorthy, Santhana, Howe, Prof. James M, & Muralidharan, Govindarajan. Determining the Nanoscale Chemistry and Behavior of Solid-Liquid Systems. United States. doi:10.1126/science.1146511.
Eswaramoorthy, Santhana, Howe, Prof. James M, and Muralidharan, Govindarajan. Mon . "Determining the Nanoscale Chemistry and Behavior of Solid-Liquid Systems". United States. doi:10.1126/science.1146511.
@article{osti_930943,
title = {Determining the Nanoscale Chemistry and Behavior of Solid-Liquid Systems},
author = {Eswaramoorthy, Santhana and Howe, Prof. James M and Muralidharan, Govindarajan},
abstractNote = {Many fundamental questions in crystal-growth behavior remain unanswered because of the difficulties encountered in simultaneously observing phases and determining elemental concentrations and redistributions while crystals nucleate and grow at the nanoscale. We show that these obstacles can be overcome by performing energy-dispersive x-ray spectroscopy on partially molten Al-Si-Cu-Mg alloy particles during in situ heating in a transmission electron microscope. Using this technique, we were able to (i) determine that the aluminum and silicon concentrations change in a complementary and symmetric manner about the solid-liquid interface as a function of temperature; (ii) directly measure the solid- and liquid-phase compositions at equilibrium and in highly undercooled conditions for quantitative comparison with thermodynamic calculations of the liquidus and solidus phase boundaries; and (iii) provide direct evidence for homogeneous nucleation of the aluminum-rich solid.},
doi = {10.1126/science.1146511},
journal = {Science},
number = ,
volume = 318,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}