Grain boundary segregation in binary nickel–bismuth alloy
| Autor: | Guido Schmitz, Ralf Schlesiger, Lei Zheng, A. Hamou, Mohammed Reda Chellali, B. Bakhti, Jozef Janovec |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Polymers and Plastics Alloy chemistry.chemical_element Thermodynamics 02 engineering and technology Atom probe engineering.material Thermal diffusivity 01 natural sciences law.invention Bismuth law 0103 physical sciences Embrittlement 010302 applied physics Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Nanocrystalline material Electronic Optical and Magnetic Materials Nickel chemistry Ceramics and Composites engineering Grain boundary 0210 nano-technology |
| Zdroj: | Acta Materialia. 103:754-760 |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2015.11.003 |
| Popis: | Grain boundary segregation and segregation kinetics are investigated by means of atom probe tomography in a binary Nanocrystalline nickel-bismuth alloy. Gibbsian excess and width of segregation layers at grain boundary are quantitatively determined. If segregation is approximated by McLean kinetics, remarkably fast volume transport of bismuth is derived. However, details of the segregation kinetics are in significant contrast to the McLean model. Additional influence of attractive Bismuth interaction is indicated. The experimentally demonstrated clear segregation tendency suggests that reported embrittlement of Ni–Bi alloys is due to significant grain boundary segregation of Bi. Diffusivity of Bi in nanocrystalline Ni and segregation amplitude were found to be D B ≈ ( 2.16 ± 0.48 ) × 10 − 21 m 2 s − 1 , and 17 respectively. |
| Databáze: | OpenAIRE |
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