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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of an abrupt change growth velocity on directionally solidified microstructures of Ni-24.19 wt%Nb hypereutectic alloy
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Effect of an abrupt change growth velocity on directionally solidified microstructures of Ni-24.19 wt%Nb hypereutectic alloy

机译：急剧变化的生长速度对Ni-24.19 wt％Nb过共晶合金定向凝固组织的影响

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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-Ni_3Nb 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-Ni_3Nb single phase. Another probable factor to permit the coupled eutectic growth stable at 10 μm/s is the difficult nucleation of β-Ni_3Nb 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.
机译：研究了Ni-24.19 wt％Nb过共晶合金的微观组织演变，以开发一种提高定向凝固原位复合材料生产率的方法。结果表明，在恒定的10μm/ s的生长速度下，首先从液体中析出了粗晶的β-Ni_3Nb板状枝晶。然而，当生长速度从1μm/ s突然变化为10μm/ s时，在凝固组织中仅观察到耦合的生长共晶。稳定在10μm/ s的共晶耦合生长可能归因于耦合共晶的界面生长温度超过β-Ni_3Nb单相的界面生长温度。允许耦合共晶生长稳定在10μm/ s的另一个可能因素是在共晶生长界面前的β-Ni_3Nb相难以成核。通过更改凝固工艺，Ni-24.19 wt％Nb过共晶合金原位形成复合材料的生产率提高了5倍。

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