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Decreasing the grain boundary diffusivity in binary alloys with increasing temperature.

Xiaomeng Shi1, Jian Luo

  • 1School of Materials Science and Engineering and Center for Optical Materials Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634, USA.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Grain boundary diffusivity in alloys can decrease with rising temperature due to premelting and prewetting phenomena. This study experimentally confirms this counterintuitive finding in a Mo-Ni alloy, impacting material science theories.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Physical Metallurgy

Background:

  • Classical theories often assume grain boundary (GB) diffusivity increases with temperature.
  • Interfacial phenomena like adsorption (segregation) are typically studied independently of structural disordering.
  • Understanding GB behavior is crucial for predicting material performance and designing new alloys.

Purpose of the Study:

  • To investigate the temperature dependence of grain boundary diffusivity in a binary alloy.
  • To explore the role of interfacial thermodynamic phenomena (GB premelting, prewetting, retrograde solubility) on GB diffusivity.
  • To experimentally validate a theoretical model predicting counterintuitive diffusivity behavior.

Main Methods:

  • Development of an interfacial thermodynamic model incorporating GB premelting, prewetting, and retrograde solubility.
  • Experimental investigation using a single-phase Mo +0.5 at.% Ni alloy.
  • Measurement of GB diffusivity as a function of temperature.

Main Results:

  • The study confirmed a decrease in GB diffusivity with increasing temperature in the Mo-Ni alloy.
  • The observed behavior aligns with the predictions of the interfacial thermodynamic model.
  • The interplay of premelting, prewetting, and retrograde solubility was identified as the cause for decreased GB diffusivity.

Conclusions:

  • The findings challenge classical GB adsorption theories by highlighting the importance of coupling with structural disordering.
  • The study provides critical experimental support for GB premelting and prewetting theories.
  • The results have broad implications for understanding and manipulating GB properties in various alloy systems.