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Composition formulas of binary eutectics.

Y P Ma1,2, D D Dong1, C Dong1

  • 1Key Laboratory of Materials Modification (Ministry of Education), School of Materials Science &Engineering, Dalian University of Technology, Dalian 116024, China.

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|December 15, 2015
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Summary
This summary is machine-generated.

A new cluster-plus-glue-atom model explains eutectic point compositions. This structural tool describes eutectic liquids as dual subunits, validating findings in boron-containing and binary eutectics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Eutectic point compositions have long been a puzzle in materials science.
  • Understanding short-range order in liquids is crucial for predicting material properties.

Purpose of the Study:

  • Introduce a novel structural tool, the cluster-plus-glue-atom model, to address the eutectic composition puzzle.
  • Develop a structural model for eutectic liquids based on short-range order units.

Main Methods:

  • Applied the cluster-plus-glue-atom model to describe eutectic liquids.
  • Assumed eutectic liquids consist of two subunits derived from eutectic phases.
  • Utilized cluster formulas, [cluster]gluex, for ideal metallic glasses and adapted them for eutectic liquids.

Main Results:

  • Established a dual cluster formulism for eutectic liquids, validated in boron-containing and binary eutectics with <1 at.% accuracy.
  • Demonstrated that dual cluster formulas vary significantly and are rarely identical.
  • Identified specific cluster matching rules, e.g., cuboctahedron + capped trigonal prism.

Conclusions:

  • The cluster-plus-glue-atom model provides a robust framework for understanding eutectic liquid structures.
  • The dual cluster model successfully explains the composition of various eutectic systems.
  • This approach offers new insights into the short-range order governing eutectic behavior.