Phase Stability of the Laves Phase Cr2 in a Two-Phase Cr-Cr2Nb Alloy

doi:10.1007/s40195-013-0140-x

Abstract

Abstract:

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), DOI: 10.1007/s40195-013-0140-x.

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Phase Stability of the Laves Phase Cr₂ in a Two-Phase Cr-Cr₂Nb Alloy

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