Phase stability of the laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy
Phase stability of the laves phase Cr2Nb in a two-phase Cr-Cr2Nb alloy
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DOI：
10.1007/s40195-013-0140-x
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发表时间：
2013-11
期刊：
影响因子：
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通讯作者：
Kewei Li;Shuangming Li;Sixiang Zhao;H. Zhong;Y. Xue;H. Fu
中科院分区：
文献类型：
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作者：
Kewei Li;Shuangming Li;Sixiang Zhao;H. Zhong;Y. Xue;H. Fu
采用X射线衍射、透射电镜和选区电子衍射等方法研究了电弧熔炼双相Cr-Cr2 Nb合金中Laves相Cr2 Nb的相稳定性。实验结果表明，铸态合金由C15-Cr2 Nb和Cr相组成，未发现文献报道的Cr2 Nb的中间相C36和高温相C14。这些结果，结合实际凝固条件的详细分析，揭示了C14-Cr2 Nb是一个亚稳态，而不是一个稳定的高温变形。在共晶团中随机分布着一种极细的片层组织，它可能是过饱和C15-Cr2 Nb 3通过不连续沉淀反应分解而形成的。
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-Cr2Nbviaa discontinuous precipitation reaction.