Dendrite growth velocity in the undercooled melt of glass forming Ni50Zr50 compound
Dendrite growth velocity in the undercooled melt of glass forming Ni50Zr50 compound
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DOI：
10.1080/09500839.2017.1330561
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发表时间：
2017-05
影响因子：
1.2
通讯作者：
R. Kobold-;W. Kuang;H. Wang;W. Hornfeck;M. Kolbe;D. Herlach
中科院分区：
文献类型：
--
作者：
R. Kobold-;W. Kuang;H. Wang;W. Hornfeck;M. Kolbe;D. Herlach
摘要采用无容器过冷和静电悬浮法对Ni50Zr50金属间化合物进行了非晶化凝固。大的过冷度高达300 K。采用高速摄像技术测量了同成分熔化合金的枝晶生长速度随过冷度的变化。实验数据进行了分析，在一个尖锐的界面理论。结果表明，在126 K时，结晶驱动力控制着生长动力学，动力学过冷度占主导地位，并随过冷度的增大而迅速增大。绘制了动力学过冷度的最大前置因子与温度倒数的关系曲线。讨论了它的温度依赖性。
Abstract Glass-forming Ni50Zr50 intermetallic compound is containerless undercooled and solidified using electrostatic levitation. Large undercoolings up to ∆T = 300 K are achieved. The dendrite growth velocity of the congruently melting alloy is measured as a function of undercooling using a high-speed camera technique. The experimental data is analysed within a sharp interface theory. It is found that the driving force of crystallisation is controlling the growth kinetics at ∆T 126 K, the kinetic undercooling dominates and increases rapidly with the undercooling ∆T. The maximum prefactor of the kinetic undercooling is plotted vs. the reciprocal temperature. Its temperature dependence is discussed.