Effect of composition on the matrix transformation of the Co-Re-Cr-Ta-C alloys

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F16%3A00461724" target="_blank" >RIV/61389005:_____/16:00461724 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/s12540-016-5697-2" target="_blank" >http://dx.doi.org/10.1007/s12540-016-5697-2</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s12540-016-5697-2" target="_blank" >10.1007/s12540-016-5697-2</a>

Result language
angličtina
Original language name
Effect of composition on the matrix transformation of the Co-Re-Cr-Ta-C alloys
Original language description
Neutron diffraction measurement was performed in-situ at high temperatures on Co-Re-Ta-C alloys with and without Cr addition. This included alloys containing different C content with the C/Ta ratio varying between 0.5 and 1.0. The Co-Re-solid solution matrix of the experimental alloys is polymorphic (like in pure cobalt) and transformed from low temperature hexagonal E > phase to high temperature cubic gamma phase on heating. This transformation is reversible and show hysteresis. The main alloying addition, Re, stabilizes the E > Co-phase and increases the transformation temperature to above 1273 K. The onset of the transformation during heating and cooling was found to differ depending on the alloy composition. In alloys without Cr addition the transformation was not completed on cooling and the high temperature gamma phase was partly retained at room temperature in metastable state with the amount depending on the cooling rate from high temperature. The diffraction and microstructural results showed that Cr is E > stabilizer (similar as Re) but the role of Ta is not clear. The C/Ta ratio has no direct effect on the matrix phase transformation. Nevertheless, it influences indirectly by determining the amount of Ta which is freely available in the matrix.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Project
<a href="/en/project/GB14-36566G" target="_blank" >GB14-36566G: Multidisciplinary research centre for advanced materials</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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