Thermal and chemical stability of Cr2AlC in contact with α-Al2O3 and NiAl
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David E. Hajas
, Mirjam Scholz , Sergey Ershov , Bengt Hallstedt , Jens-Petter Palmquist und Jochen M. Schneider
Abstract
The thermal and chemical stability of Cr2AlC, Cr2AlC–NiAl and Cr2AlC–α-Al2O3 have been studied. No enthalpic effects indicating phase transformations or chemical reactions were observed for the Cr2AlC–α-Al2O3 powder mixtures at T < 1476°C, while a melting onset temperature of 1310°C was measured for the Cr2AlC–NiAl powder mixture by differential thermal analysis. However, the formation of chromium carbide is also predicted to occur below this temperature based on our thermodynamic calculations, and was observed by X-ray diffraction of powders annealed at 1000 and 1300°C. The carbide formation is caused by the reaction of Cr2AlC with NiAl and can be understood by considering the large solid solution range of Al in NiAl. These results indicate that the application potential of Cr2AlC–NiAl composites is limited by the Al solubility in the NiAl.
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© 2010, Carl Hanser Verlag, München
Artikel in diesem Heft
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- DGM News
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Artikel in diesem Heft
- Basic
- High-temperature in-situ microscopy during stress-induced phase transformations in Co49Ni21Ga30 shape memory alloy single crystals
- Contents
- contents
- Editorial
- Editorial December 2010
- Basic
- Atomic mobilities and diffusivities in the fcc, L12 and B2 phases of the Ni-Al system
- Experimental investigation of the Zn–Fe–V system at 450°C
- Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al–Cu–Ag alloys
- Reassessment of the Mg–Ge binary system using CALPHAD supported by first-principles calculation
- A quantitative modeling of the unloading behavior of metals during a tensile test
- A technique for diameter enlargement in SiC crystal growth
- Applied
- Thermal and chemical stability of Cr2AlC in contact with α-Al2O3 and NiAl
- Microstructure and mechanical properties of Zn25Al3Cu based composites with large Al2O3 particles at room and elevated temperatures
- An investigation on Incoloy800-SS304 clad plate by explosive welding
- Effect of grain boundary precipitates on vibration damping of FeüCrüMgüAl/Si alloy
- Adsorption of metal ions on magnetic carbon nanomaterials bearing chitosan-functionalized silica
- Tensile and in-vitro degradation study of electro spun fibrous mat produced from eri silk fibroin
- Study of the influence of UV-irradiation on the photodegradation of plasticized poly(para-tert-butylstyrene) films
- Enhanced photocatalytic activity of beryllium doped titania in visible light on the degradation of methyl orange dye
- Progress in chemistry modelling for vapour and aerosol transport analyses
- DGM News
- Personal