Dorcheh, Ali S. ; Donner, Wolfgang ; Galetz, Mathias C. (2018)
From eutectic to peritectic: Effect of Ge on morphology, structure, and coarsening of Cr-Cr3Si alloys.
In: Intermetallics, 93
doi: 10.1016/j.intermet.2017.11.020
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The influence of germanium on microstructure, crystallography, and thermal stability of the eutectic Cr-Cr3Si alloy was investigated. Fine eutectic microstructures could be preserved but slightly degenerated when up to 2 at.% Si was substituted by Ge. A transition from eutectic to peritectic microstructure composed of primary dendrites and A15 Cr3Si matrix was observed when higher amounts of Ge were added. X-ray diffraction results showed no limit for substitution of Si and Ge in the studied composition range. The lattice parameter of both Cr solid-solution and A15 silicide increased with increasing the Ge/Si ratio. A macro was developed for the ImageJ program to automate the quantitative microstructural image analysis. Results showed that Ge addition increases the A15 phase fraction of the two-phase alloys. Microstructural investigations on annealed alloys at 1350 degrees C demonstrated that the coarsening of both binary Cr-Cr3Si and ternary Cr-Cr-3(Si, Ge) is interface-controlled. Although Ge addition to the eutectic alloy offered an isotropic microstructure, it decreased the thermal stability by degeneration of the lamellar structure.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Dorcheh, Ali S. ; Donner, Wolfgang ; Galetz, Mathias C. |
| Art des Eintrags: | Bibliographie |
| Titel: | From eutectic to peritectic: Effect of Ge on morphology, structure, and coarsening of Cr-Cr3Si alloys |
| Sprache: | Englisch |
| Publikationsjahr: | Februar 2018 |
| Verlag: | DECHEMA Forschungsinstitut |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Intermetallics |
| Jahrgang/Volume einer Zeitschrift: | 93 |
| DOI: | 10.1016/j.intermet.2017.11.020 |
| URL / URN: | https://doi.org/10.1016/j.intermet.2017.11.020 |
| Kurzbeschreibung (Abstract): | The influence of germanium on microstructure, crystallography, and thermal stability of the eutectic Cr-Cr3Si alloy was investigated. Fine eutectic microstructures could be preserved but slightly degenerated when up to 2 at.% Si was substituted by Ge. A transition from eutectic to peritectic microstructure composed of primary dendrites and A15 Cr3Si matrix was observed when higher amounts of Ge were added. X-ray diffraction results showed no limit for substitution of Si and Ge in the studied composition range. The lattice parameter of both Cr solid-solution and A15 silicide increased with increasing the Ge/Si ratio. A macro was developed for the ImageJ program to automate the quantitative microstructural image analysis. Results showed that Ge addition increases the A15 phase fraction of the two-phase alloys. Microstructural investigations on annealed alloys at 1350 degrees C demonstrated that the coarsening of both binary Cr-Cr3Si and ternary Cr-Cr-3(Si, Ge) is interface-controlled. Although Ge addition to the eutectic alloy offered an isotropic microstructure, it decreased the thermal stability by degeneration of the lamellar structure. |
| Freie Schlagworte: | Eutectic, Peritectic, ImageJ, Coarsening, Cr3Si, Chromium |
| Zusätzliche Informationen: | German Research Foundation (DFG) is thanked for the financial support of this work (GA-7704/1-1). |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung |
| Hinterlegungsdatum: | 14 Sep 2020 07:22 |
| Letzte Änderung: | 14 Sep 2020 07:22 |
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