Studying on the morphology of primary phase by 3D-CT technology and controlling eutectic growth by tailoring the primary phase
Studying on the morphology of primary phase by 3D-CT technology and controlling eutectic growth by tailoring the primary phase
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利用3D-CT技术研究初生相形貌并通过定制初生相控制共晶生长
DOI：
10.1016/j.jallcom.2019.153457
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发表时间：
2020-04
影响因子：
6.2
通讯作者：
Yves Fautrelle
中科院分区：
文献类型：
--
作者：
Xi Li;Jiantao Wang;Long Hou;Annie Gagnoud;Yves Fautrelle
结构的形态和排列决定材料特性。本工作通过3D-CT技术研究了过共晶合金中典型初生Al2Cu和Al3Ni相的形貌，并进一步阐明了它们的生长特征。实验结果表明，Al2Cu和Al3Ni相在较低的生长速率下生长，具有刻面特征，并且随着生长速率的增加，出现刻面相向非刻面相的转变。研究还发现，施加温度梯度或/和磁场能够控制初生Al2Cu和Al3Ni相的生长，并且初生Al2Cu和Al3Ni相的排列显着影响Al-Al2Cu和Al-Al3Ni共晶的排列。这意味着可以通过在施加磁场或/和温度梯度期间调整主相来控制共晶相。最后，提出了一种通过调整初生相来控制共晶相生长的简单模型。目前的工作可以加深对Al2Cu和Al3Ni相生长特性的理解，并提供一种通过调控初生相来控制共晶相的新方法。
Morphology and alignment of the structure determine material properties. In the present work, the morphologies of the typical primary Al2Cu and Al3Ni phases in hypereutectic alloys are studied by 3D-CT technology, and their growth characteristics have been clarified further. The experimental result reveals that the Al2Cu and Al3Ni phases grow with a faceted characteristic at a lower growth rate, and the transition from the faceted phase to the non-faceted phase occurs with the increase of growth rate. It is also found that the application of the temperature gradient or/and the magnetic field is capable of controlling the growth of the primary Al2Cu and Al3Ni phases, and the alignments of the primary Al2Cu and Al3Ni phases remarkably affect that of the Al–Al2Cu and Al–Al3Ni eutectic. This implies that the eutectic phase can be controlled by tailoring the primary phases during imposing the magnetic field or/and temperature gradient. Finally, a simple model of controlling the growth of the eutectic phase by tailoring the primary phase is proposed. The present work can deepen the understanding on the growth characteristics of the Al2Cu and Al3Ni phases and offer a new method to control the eutectic phase by tailoring the primary phase.
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