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首页> 美国卫生研究院文献>Scientific Reports >Evidence for the transition from primary to peritectic phase growth during solidification of undercooled Ni-Zr alloy levitated by electromagnetic field
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Evidence for the transition from primary to peritectic phase growth during solidification of undercooled Ni-Zr alloy levitated by electromagnetic field

机译：在电磁场作用下过冷的Ni-Zr合金凝固过程中从初生相到包晶相生长的证据

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摘要

The Ni83.25Zr16.75 peritectic alloy was undercooled by electromagnetic levitation method up to 198 K. The measured dendritic growth velocity shows a steep acceleration at a critical undercooling of ΔTcrit = 124 K, which provides an evidence of the transition of the primary growth mode from Ni7Zr2 phase to peritectic phase Ni5Zr. This is ascertained by combining the temperature-time profile and the evolution of the solidified microstructures. Below the critical undercooling, the solidified microstructure is composed of coarse Ni7Zr2 dendrites, peritectic phase Ni5Zr and eutectic structure. However, beyond the critical undercooling, only a small amount of Ni7Zr2 phase appears in the solidified microstructure. The dendritic growth mechanism of Ni7Zr2 phase is mainly governed by solute diffusion. While, the dendritic growth mechanism of Ni5Zr phase is mainly controlled by thermal diffusion and liquid-solid interface atomic attachment kinetics.
机译：通过电磁悬浮法将Ni83.25Zr16.75包晶合金过冷至198 K，在临界过冷度ΔTcrit= 124 K时，测得的枝晶生长速度显示出陡峭的加速度，这提供了初生生长模式转变的证据从Ni7Zr2相到包晶相Ni5Zr。这可以通过结合温度-时间曲线和凝固的微结构的演变来确定。在临界过冷以下，凝固的微观结构由粗大的Ni7Zr2树枝晶，包晶相Ni5Zr和共晶结构组成。但是，除了临界过冷之外，凝固组织中仅出现少量的Ni7Zr2相。 Ni7Zr2相的树枝状生长机制主要受溶质扩散控制。而Ni5Zr相的树枝状生长机制主要受热扩散和液固界面原子附着动力学控制。

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