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Homogeneity of a supersaturated solid solution.

J H He1, H W Sheng, J S Lin

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

Physical Review Letters
|September 13, 2002
PubMed
Summary
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Rapid quenching creates supersaturated silver-copper (Ag-Cu) solid solutions, but these often contain nanoscale decomposition features. Conventional methods fail to detect this inhomogeneity in alloys.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Metallurgy

Background:

  • Silver-copper (Ag-Cu) alloys are a classic system for studying solubility.
  • Rapid quenching can extend solubility beyond the equilibrium miscibility gap.
  • Understanding the homogeneity of supersaturated solid solutions is crucial for alloy performance.

Purpose of the Study:

  • To investigate the homogeneity of face-centered cubic (fcc) solid solutions in the Ag-Cu system formed by rapid quenching.
  • To determine if supersaturated Ag-Cu solutions are truly uniform or exhibit decomposition.
  • To highlight the limitations of conventional methods in characterizing these alloys.

Main Methods:

  • Extended X-ray Absorption Fine Structures (EXAFS) spectroscopy.
  • Small-Angle X-ray Scattering (SAXS).

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  • Atomistic model calculations.

    • Main Results:

    • Supersaturated Ag-Cu solid solutions were successfully formed, extending across the miscibility gap.
    • Decomposition features, on the scale of approximately 1 nanometer, were observed in many of the quenched samples.
    • EXAFS, SAXS, and modeling provided detailed insights into the nanoscale structure.

    Conclusions:

    • Conventional diffraction techniques are insufficient for accurately assessing supersaturation levels and uniformity in these alloys.
    • The presence of nanoscale decomposition indicates that extended solubility does not always result in a homogeneous solid solution.
    • Advanced characterization methods are necessary to reveal the true microstructure of rapidly quenched alloys.