Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1500856 | Scripta Materialia | 2010 | 4 Pages |
Abstract
High-temperature differential thermal analysis and neutron diffraction have been employed to investigate the previously proposed polytypic phase transformation C14–NbCr2⇄C15–NbCr2C14–NbCr2⇄C15–NbCr2 at around 1600 °C. It could be shown that the phase transformation does not occur for high-purity alloys and high-purity conditions. However, small amounts of atmospheric contaminations induce the formation of an η-carbide-type phase, which melts (partially) in a temperature range around 1600 °C. This led to the earlier erroneous conclusion of the occurrence of a thermodynamically stable high-temperature modification of NbCr2.
Related Topics
Physical Sciences and Engineering
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Authors
J. Aufrecht, A. Leineweber, A. Senyshyn, E.J. Mittemeijer,