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Entropy decay during grain growth.

Pawan Vedanti1, Xin Wu2, Victor Berdichevsky2

  • 1Department of Mechanical Engineering, Wayne State University, Detroit, MI, 48202, USA. fr6588@wayne.edu.

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|July 19, 2020
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Summary
This summary is machine-generated.

Microstructure entropy decays in isolated systems, aligning with a proposed fourth law of thermodynamics. This study experimentally confirms entropy reduction during grain growth and reveals a universal relationship with energy.

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Area of Science:

  • Thermodynamics
  • Materials Science
  • Statistical Mechanics

Background:

  • Materials with random microstructures possess unique thermodynamic properties, including entropy and temperature.
  • A hypothesis suggests a fourth law of thermodynamics: microstructure entropy decreases in isolated systems.

Purpose of the Study:

  • To experimentally validate the proposed fourth law of thermodynamics concerning microstructure entropy decay.
  • To investigate the equation of state for microstructure entropy and its dependence on energy and grain size.

Main Methods:

  • Experimental analysis of the grain growth process.
  • Measurement of microstructure entropy, energy, and average grain size.
  • Statistical analysis to determine relationships between thermodynamic parameters.

Main Results:

  • Experimental evidence confirms the decay of grain structure entropy in isolated systems.
  • The equation of state for microstructure entropy was studied.
  • A universal dependence of microstructure entropy on microstructure energy was observed during self-similar grain growth.

Conclusions:

  • The study supports the assertion of a fourth law of thermodynamics related to microstructure entropy.
  • Microstructure entropy is linked to microstructure energy and grain size, with a universal relationship observed under specific conditions.