On oscillatory microstructure during cellular growth of directionally solidified Sn-36at.%Ni peritectic alloy.
On oscillatory microstructure during cellular growth of directionally solidified Sn-36at.%Ni peritectic alloy.
复制标题
On%20振荡%20显微组织%20during%20细胞%20生长%20of%20定向%20凝固%20Sn–36at.%Ni%20包晶%20合金
DOI：
10.1038/srep24315
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发表时间：
2016-04-12
影响因子：
4.6
通讯作者：
Guo J
中科院分区：
文献类型：
--
作者：
Peng P;Li X;Li J;Su Y;Guo J
在含有窄溶解度范围金属间化合物的定向凝固 Sn-36at.%Ni 超包晶合金的深部生长过程中，观察到振荡微观结构。这种尺寸为数十微米的振荡微观结构是首次被观察到。这种波状振荡结构的形态类似于次级枝晶臂，并且只能在样品的某些局部位置观察到。通过对样品的连续切片等分析，可以得出结论，这种振荡微观结构是由凝固过程中糊状区的振荡对流引起的。通过波长上的实验结果与计算结果的比较，表征了对流对这种振荡微结构的影响。此外，这种振荡微观结构的形态变化已被证明是由凝固过程中的包晶转变引起的。此外，溶解度范围窄的金属间化合物在凝固过程中熔体浓度不断增加，这有助于形成这种振荡微观结构。
An oscillatory microstructure has been observed during deep-cellular growth of directionally solidified Sn–36at.%Ni hyperperitectic alloy containing intermetallic compounds with narrow solubility range. This oscillatory microstructure with a dimension of tens of micrometers has been observed for the first time. The morphology of this wave-like oscillatory structure is similar to secondary dendrite arms, and can be observed only in some local positions of the sample. Through analysis such as successive sectioning of the sample, it can be concluded that this oscillatory microstructure is caused by oscillatory convection of the mushy zone during solidification. And the influence of convection on this oscillatory microstructure was characterized through comparison between experimental and calculations results on the wavelength. Besides, the change in morphology of this oscillatory microstructure has been proved to be caused by peritectic transformation during solidification. Furthermore, the melt concentration increases continuously during solidification of intermetallic compounds with narrow solubility range, which helps formation of this oscillatory microstructure.