Segregation and corrosion behavior of incommensurate 45{degree}[100] grain boundaries in an Fe-Si alloy: The role of grain boundary plane orientation
- Academy of Sciences of the Czech Republic, Prague (Czech Republic). Inst. of Physics
- Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany)
Measurements of the temperature dependencies of the chemical composition of 45{degree}[100] incommensurate tilt grain boundaries in an Fe-3.55at.%Si alloy revealed large differences between the segregation behavior of {l_brace}0kl{r_brace} symmetrical and (001)/(011) asymmetrical grain boundaries. The low negative values of the segregation enthalpies of Si, P and C determined at the latter interface as compared to those of the former one are correlated with the cusps found in the orientation dependencies of the etched groove dimensions at a curved grain boundary and with the effective separation of atomic planes parallel to the boundary. The results disclose the surprising fact that the (001)/(011) asymmetrical grain boundary possesses singular character whereas the {l_brace}0kl{r_brace} symmetrical interface is of the general type. The conclusions highlights the importance of the orientation of the grain boundary plane to characterize a grain boundary and its resulting properties.
- OSTI ID:
- 540967
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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