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Related Experiment Videos

Amorphous structures in the immiscible Ag-Ni system.

J H He1, H W Sheng, P J Schilling

  • 1Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA.

Physical Review Letters
|April 6, 2001
PubMed
Summary
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Vapor quenching creates novel Ag-Ni alloys with fine-scale, spinodal-like structures. This heterogeneity explains their unusually low crystallization heat and temperature.

Area of Science:

  • Materials Science
  • Metallurgy
  • Condensed Matter Physics

Background:

  • Phase-separating alloy systems like Silver-Nickel (Ag-Ni) present unique challenges in achieving desired material properties.
  • Conventional characterization methods often fail to reveal the true atomic-level structure of rapidly quenched alloys.

Purpose of the Study:

  • To investigate the atomic-level structure of Ag-Ni alloys produced by vapor quenching.
  • To correlate the observed structure with experimentally measured thermal properties, specifically crystallization behavior.

Main Methods:

  • Utilized extended X-ray absorption fine structure (EXAFS) spectroscopy for atomic-level structural analysis.
  • Employed reverse Monte Carlo (RMC) and molecular dynamics (MD) simulations to model and interpret structural data.

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  • Performed calorimetric measurements to determine heat and temperature of crystallization.

    • Main Results:

    • Ag-Ni alloys produced by vapor quenching exhibit a highly heterogeneous, spinodal-like nanostructure, not a homogeneous amorphous phase.
    • This fine-scale structural inhomogeneity was confirmed through a combination of EXAFS, RMC, and MD simulations.
    • A direct correlation was established between the material's heterogeneous structure and its significantly reduced crystallization heat and temperature.

    Conclusions:

    • The apparent amorphous nature of vapor-quenched Ag-Ni alloys masks an underlying, fine-scale spinodal decomposition structure.
    • This intrinsic structural heterogeneity is the primary factor driving the low crystallization energy observed.
    • Advanced structural probes are crucial for understanding the complex nature of novel alloy phases.