Interaction of cobalt with chromium and rhenium

Sokolovskaya, E.M.; Tuganbaev, M.L.; Stepanova, G. I.; Kazakova, E. F.; Sokolova, I.G.

doi:10.1016/0022-5088(86)90502-3

Cited by 18 publications

(4 citation statements)

References 1 publication

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“…Site occupancies have been studied in [26]. The ternary Re-Cr-Co system has been studied experimentally by Sokolovskaya et al [27]. These authors have demonstrated a complete homogeneity domain between the σ phase present in the two binary systems.…”

Section: Re-cr-co (σ Phase)mentioning

confidence: 99%

Irregular Homogeneity Domains in Ternary Intermetallic Systems

2015

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Abstract:Ternary intermetallic A-B-C systems sometimes have unexpected behaviors. The present paper examines situations in which there is a tendency to simultaneously form the compounds ABx, ACx and BCx with the same crystal structure. This causes irregular shapes of the phase homogeneity domains and, from a structural point of view, a complete reversal of site occupancies for the B atom when crossing the homogeneity domain. This work reviews previous studies done in the systems Fe-Nb-Zr, Hf-Mo-Re, Hf-Re-W, Mo-Re-Zr, Re-W-Zr, Cr-Mn-Si, Cr-Mo-Re, and Mo-Ni-Re, and involving the topologically close-packed Laves, χ and σ phases. These systems have been studied using ternary isothermal section determination, DFT calculations, site occupancy measurement using joint X-ray, and neutron diffraction Rietveld refinement. Conclusions are drawn concerning this phenomenon. The paper also reports new experimental or calculated data on Co-Cr-Re and Fe-Nb-Zr systems.

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Section: Re-cr-co (σ Phase)mentioning

confidence: 99%

Irregular Homogeneity Domains in Ternary Intermetallic Systems

2015

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“…after about 10 h. The Co-Re matrix gets enriched in Cr as the Cr 23 C 6 phase dissolves, which then stabilizes the Cr-Re-rich phase (Mukherji, Klauke et al, 2010). In this context, it is interesting to note that the binary Co-Re phase diagram does not show a stable phase (Massalski, 1986), but Cr addition to the Co-Re alloy stabilizes the phase at Cr content greater than 20 atomic percent (Sokolovskaya et al, 1986).…”

Section: Stability Of Carbides At High Temperaturesmentioning

confidence: 99%

Neutron and synchrotron probes in the development of Co–Re-based alloys for next generation gas turbines with an emphasis on the influence of boron additives

et al. 2014

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Nickel‐based superalloys are the materials of choice in the hot section of current gas turbines, but they are reaching temperature limits constrained by their melting temperature range. Co–Re alloy development was prompted by a search for new materials for future gas turbines, where the temperature of application will be considerably higher. Addition of the very high melting point refractory metal Re to Co can increase the melting range of Co alloys to much higher temperatures than the commercial Co alloys in use today. The alloy development strategy is first discussed very briefly. In this program, model ternary and quaternary compositions were studied in order to develop a basic understanding of the alloy system. In situ neutron and synchrotron measurements (small and wide angle) at high temperatures were extensively used for this purpose and some selected results from the in situ measurements are presented. In particular, the effect of boron doping in Co–Re–Cr alloys and the stability of the TaC precipitates at high temperatures were investigated. A fine dispersion of TaC precipitates strengthens some Co–Re alloys, and their stability at the application temperature is critical for the long‐term creep properties.

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“…In this context, several metallic systems have been proposed as potential hightemperature structural materials beyond the temperature capability of currently used Ni-based superalloys (e.g., novel intermetallics (Ru-Al and Ru-Ni-Al), 1,2 γ′-strengthened Co-based, 3,4 or Pt-based superalloys, 5 phase Nb-Si alloys). [7][8][9] In a large-scale research project funded by the German Science Foundation DFG, our research unit has focused on two alloy systems: Mo-Si-B, which has been been studied for a decade or so [10][11][12] and for which the research unit has expertise, 9,13,14 and Co-Re-Cr, which has scarcely been characterized 15,16 but shows promise.…”

Section: Introductionmentioning

confidence: 99%

Metallic materials for structural applications beyond nickel-based superalloys

Heilmaier

Krüger

Saage

et al. 2009

JOM

105

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This paper reviews our current research activities on developing new multiphase metallic materials for structural applications with a temperature capability beyond 1,200ºC. Two promising material systems have been chosen: fi rst, alloys in the system Mo-Si-B which have demonstrated potential due to their high melting point of around 2,000ºC and due to the formation of a protecting borosilicate glass layer on the surface at temperatures exceeding 900ºC; and second, novel Co-Re-based alloys which have been chosen as a model system for complete miscibility between the elements cobalt and rhenium, offering the possibility of continuous increases of the melting point of the alloy through rhenium additions.

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Interaction of cobalt with chromium and rhenium

Cited by 18 publications

References 1 publication

Irregular Homogeneity Domains in Ternary Intermetallic Systems

Irregular Homogeneity Domains in Ternary Intermetallic Systems

Neutron and synchrotron probes in the development of Co–Re-based alloys for next generation gas turbines with an emphasis on the influence of boron additives

Metallic materials for structural applications beyond nickel-based superalloys

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