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Thermal and chemical stability of Cr2AlC in contact with α-Al2O3 and NiAl

  • David E. Hajas , Mirjam Scholz , Sergey Ershov , Bengt Hallstedt , Jens-Petter Palmquist and Jochen M. Schneider
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 101 Issue 12

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.

Keywords: Cr < Al–C; Thermal stability; Differential thermal analysis
* Correspondence address, Prof. Jochen M. Schneider, Ph.D., Materials Chemistry, RWTH Aachen University, Mies-van-der-Rohe-Str. 20, D-52074 Aachen, Germany. Tel.: +49 241 8025967, Fax: +49 241 8022295. E-mail:

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Received: 2009-12-2
Accepted: 2010-10-4
Published Online: 2013-06-11
Published in Print: 2010-12-01

© 2010, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110439
Keywords for this article
Cr < Al–C; Thermal stability; Differential thermal analysis

Articles in the same Issue

  1. Basic
  2. High-temperature in-situ microscopy during stress-induced phase transformations in Co49Ni21Ga30 shape memory alloy single crystals
  3. Contents
  4. contents
  5. Editorial
  6. Editorial December 2010
  7. Basic
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  9. Experimental investigation of the Zn–Fe–V system at 450°C
  10. Time resolved X-ray imaging of eutectic cellular patterns evolving during solidification of ternary Al–Cu–Ag alloys
  11. Reassessment of the Mg–Ge binary system using CALPHAD supported by first-principles calculation
  12. A quantitative modeling of the unloading behavior of metals during a tensile test
  13. A technique for diameter enlargement in SiC crystal growth
  14. Applied
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  16. Microstructure and mechanical properties of Zn25Al3Cu based composites with large Al2O3 particles at room and elevated temperatures
  17. An investigation on Incoloy800-SS304 clad plate by explosive welding
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