Effect of an abrupt change growth velocity on directionally solidified microstructures of Ni-24.19 wt%Nb hypereutectic alloy

Shuangming Li, Yanping Song, Bole Ma, Ling Tang, Hengzhi Fu

科研成果: 期刊稿件文章同行评审

11 引用 (Scopus)

摘要

Microstructure evolution of Ni-24.19 wt%Nb hypereutectic alloys was investigated to develop a method to increase the productivity of in situ composite in directional solidification. The results show that at the constant growth velocity of 10 μm/s, coarse priamry β-Ni3Nb plate dendrites were firstly precipitated from the liquid. However, at the growth velocity changing abruptly from 1 μm/s to 10 μm/s, only coupled growth eutectics were observed in the solidification microstructure. The coupled eutectic growth stable at 10 μm/s is possibly ascribed to the interface growth temperature of coupled eutecitc exceeding that of β-Ni3Nb single phase. Another probable factor to permit the coupled eutectic growth stable at 10 μm/s is the difficult nucleation of β-Ni3Nb phase in front of the eutectic growth interface. By changing solidification process, the productivity for the formation of in situ composite of Ni-24.19 wt%Nb hypereutectic alloy is improved by a factor of 5.

源语言英语
页(从-至)117-123
页数7
期刊Materials Science and Engineering: A
475
1-2
DOI
出版状态已出版 - 25 2月 2008

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