期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 647, 期 -, 页码 172-178出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.06.106
关键词
Grain boundaries; Segregation; Elastic stress; Thermodynamics; Chemical potential; Molar volume
资金
- Alexander von Humboldt Foundation [CHN/1133393]
- Beijing Municipal Natural Science Foundation [2152021]
- Fok Ying Tong Education Foundation [141043]
- Aero-Science Fund [20145374001]
- China Postdoctoral Science Foundation [2014M560888]
- Fundamental Research Funds for the Central Universities [FRF-TP-12-005A2]
- Czech Science Foundation [GAP108/12/0144]
Grain boundary (GB) segregation of P in 2.25Cr1Mo steel induced by elastic stress shows that the P equilibrium concentration, after reaching the non-equilibrium concentration maximum at critical time, returns to its initial thermal equilibrium level. This finding confirms the interesting phenomenon that the effect of elastic stress on GB segregation of P is significant in kinetics while slight in thermodynamics. Through extending the pressure in classical theory of chemical potential to the elastic stress, the thermodynamic effect of elastic stress on GB segregation is studied, and the relationship between elastic stress and segregation Gibbs energy is formulated. The formulas reveal that the difference in the segregation Gibbs energy between the elastically-stressed and non-stressed states depends on the excess molar volume of GB segregation and the magnitude of elastic stress. Model calculations in segregation Gibbs energy confirm that the effect of elastic stress on the thermodynamics of equilibrium GB segregation is slight, and the theoretical analyses considerably agree with the experimental results. The confirmation indicates that the nature of the thermodynamic effect is well captured. (C) 2015 Elsevier B.V. All rights reserved.
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