Applied Thermodynamics: Grain Boundary Segregation

Entropy

Pavel Lejპk³  Lei Zheng¹  Siegfried Hofmann² 

[1] School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China; E-Mail:;Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 7, 70499 Stuttgart, Germany; E-Mail:;Laboratory of Nanostructures and Nanomaterials, Institute of Physics, Academy of Sciences of the Czech Republic (AS CR), Na Slovance 2, 182 21 Praha 8, Czech Republic; E-Mail:

关键词: interfacial segregation;    Gibbs energy of segregation;    enthalpy;    entropy;    volume;    grain boundaries;    iron;   

DOI  :  10.3390/e16031462

来源: mdpi

【 摘 要 】

Chemical composition of interfaces—free surfaces and grain boundaries—is generally described by the Langmuir–McLean segregation isotherm controlled by Gibbs energy of segregation. Various components of the Gibbs energy of segregation, the standard and the excess ones as well as other thermodynamic state functions—enthalpy, entropy and volume—of interfacial segregation are derived and their physical meaning is elucidated. The importance of the thermodynamic state functions of grain boundary segregation, their dependence on volume solid solubility, mutual solute–solute interaction and pressure effect in ferrous alloys is demonstrated.

PACS Codes: 68.35.bd; 68.35.Dv; 68.35.Md; 65.40.gd; 82.65.+r;

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland