Experimental Investigation of the Epsilon Phase in Pb–Bi System
| Autor: | Cláudio Geraldo Schön, Thiago Pires Nagasima, Luiz T.F. Eleno, V. B Martins |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Scattering Annealing (metallurgy) Metals and Alloys Hexagonal phase Intermetallic Thermodynamics 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Crystallography 0103 physical sciences Materials Chemistry Binary system 0210 nano-technology Phase diagram Eutectic system Solid solution |
| Zdroj: | Journal of Phase Equilibria and Diffusion. 38:195-200 |
| ISSN: | 1863-7345 1547-7037 |
| DOI: | 10.1007/s11669-017-0523-1 |
| Popis: | The Pb–Bi (Lead–Bismuth) binary system has gained some prominence in recent years due to the possible use of eutectic alloys as primary-circuit coolant in generation IV nuclear reactors. Apart from the terminal solid solutions A1-Pb and A7-Bi, the system presents also one intermetallic phase with the hexagonal close-packed structure (A3), usually denoted e phase. Due to the low temperatures involved in this system, attainment of equilibrium is difficult, and in addition, the proximity of x-ray scattering factors for both elements raises questions about a possible polymorphic transition. In the present work, three samples with compositions Pb–29 wt.%Bi, Pb–31 wt.%Bi and Pb–33 wt.%Bi were prepared and characterized by x-ray diffraction. The lattice parameters of e are consistent with those reported in the literature, and their dependence on Bi content was determined as well. Only the hexagonal phase was identified in the 29 wt.%Bi sample, although the currently assessed Pb–Bi phase diagram predicts the presence of the Pb-rich A1 terminal solid solution in this composition. A 2-year annealing at room temperature was performed and the XRD characterization results for these samples are compared with the original data. |
| Databáze: | OpenAIRE |
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