MICROSTRUCTURE EVOLUTION OF LAVES PHASE Cr2Nb/Cr ALLOYS PREPARED BY ARC MELTING

doi:10.3724/SP.J.1037.2010.00700

Acta Metall Sin

2011, Vol. 47

Issue (6): 663-670 DOI: 10.3724/SP.J.1037.2010.00700

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MICROSTRUCTURE EVOLUTION OF LAVES PHASE Cr₂Nb/Cr ALLOYS PREPARED BY ARC MELTING

LI Kewei, LI Shuangming, FU Hengzhi

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

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LI Kewei LI Shuangming FU Hengzhi. MICROSTRUCTURE EVOLUTION OF LAVES PHASE Cr₂Nb/Cr ALLOYS PREPARED BY ARC MELTING. Acta Metall Sin, 2011, 47(6): 663-670.

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Abstract The Cr–12%Nb (atomic fraction) and Cr–20%Nb alloys prepared by vacuum non–consumable arc melting were investigated to understand the icrostructure evolution of the Laves phase Cr₂Nb/Cr alloys. The solidified microstructures including the phase formation and competitive growth were studied using OM, XRD as well as SEM with an EDS. The results showed that different microstructure morphologies were observed in the Cr–12%Nb and Cr–20%Nb alloys. For the Cr–12%Nb alloy, divorced eutectics were grown at the bottom part of the ingot. Primary Cr dendrites and coupled eutectic (Cr₂Nb+Cr) appeared in the middle and upper part of the ingot. For the Cr–20%Nb alloy, cellular eutectics of which the lamellar spacing was about 0.3 μm were found at the bottom of the ingot. With the decrease in cooling rate in the middle and upper part of the ingot, plate primary Cr₂Nb dendrites and petal–like Cr₂Nb dendrites were developedBesides, using the TMK model for rapid utctc solidification and the BCT dendrtc growth model, the inteface growth temperatures between the coupled eutectic (Cr₂Nb+Cr) and priary Cr₂Nb phase wee computed and compared with the experimental results. Based on the maximum interface growth temperature criteria, the earance of multiple solidified microstructures of the Cr–20%Nb alloy could be explaind successfully.

Key words: vacuum non–consumable arc melting Laves phse Cr₂Nb divorced eutectic eutectic leading phase

Received: 27 December 2010

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Supported by National Natural Science Foundation of China (Nos.50971101 and 51074127), Specialized Research Fund for the Doctoral Program of Higher Education (No.20096102110011) and Basic Research Foundation of NWPU (No.JC201029)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00700 OR https://www.ams.org.cn/EN/Y2011/V47/I6/663

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