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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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A predictive structural model for bulk metallic glasses.

K J Laws1, D B Miracle2, M Ferry1

  • 1School of Materials Science and Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia.

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|September 16, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to predict metallic glass formation by analyzing atomic structures. This approach identifies specific defects and packing efficiencies to guide the design of stable bulk metallic glasses.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Understanding the atomic structure of metallic glasses is crucial for predicting their properties.
  • A clear link between atomic structure and glass-forming ability (GFA) remains elusive in amorphous metals.
  • Predicting GFA from atomic structure is a key challenge in metallic glass research.

Purpose of the Study:

  • To establish a predictive capability for metallic glass formation based on atomic structure.
  • To develop a novel approach for modeling metallic glass atomic structures.
  • To identify structural features that influence glass-forming ability.

Main Methods:

  • Developed a new modeling approach for metallic glass atomic structures.
  • Identified a new family of structural defects that hinder glass formation.
  • Implemented simultaneous efficient local packing around all atoms.
  • Enforced structural self-consistency in the models.

Main Results:

  • Identified specific structural constraints that limit the number of stable binary metallic glasses.
  • Demonstrated that increased atomic complexity (three or more atom sizes) significantly expands the range of stable bulk metallic glasses.
  • Discovered a new family of structural defects that negatively impact glass formation.

Conclusions:

  • The new modeling approach provides critical insights into the relationship between atomic structure and GFA.
  • This work lays the foundation for predicting and designing metallic glasses with enhanced stability.
  • The findings offer a pathway towards achieving the long-sought goal of predictive capability for bulk metallic glasses.