Acta Metallurgica Sinica (English Letters) >
Phase Stability of the Laves Phase Cr2 in a Two-Phase Cr-Cr2Nb Alloy
Received date: 2013-03-11
Revised date: 2013-07-14
Online published: 2014-02-28
Supported by
National Natural Science Foundation of China (Nos. 50971101, 51074127 and 51104120).
The phase stability of the Laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy produced by arc-melting was investigated using X-ray diffraction, transmission electron microscopy and selected area electron diffraction. The experimental results indicated that the as-cast ingot was consisted of C15-Cr2Nb and Cr phases; the intermediate C36 and high-temperature C14 modifications of Cr2Nb, reported in literatures, were not detected in this study. These results, combined with a detailed analysis of the actual solidification conditions, revealed that the C14-Cr2Nb was a metastable rather than a stable high-temperature modification. Moreover, a kind of extremely fine lamellar structure was found to be randomly distributed in the eutectic cells, which may be formed by decomposition of the supersaturated C15-Cr2Nb via a discontinuous precipitation reaction.
Key words： Laves phase; Microstructure; Intermetallics; Phase transformation
Kewei LI , Shuangming LI , Sixiang ZHAO , Hong ZHONG , Yunlong XUE , Hengzhi FU . Phase Stability of the Laves Phase Cr2 in a Two-Phase Cr-Cr2Nb Alloy[J]. Acta Metallurgica Sinica (English Letters), 2013 , 26(6) : 687 -692 . DOI: 10.1007/s40195-013-0140-x
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