Revealing dendritic pattern formation in Ni, Fe and Co alloys using synchrotron tomography
Revealing dendritic pattern formation in Ni, Fe and Co alloys using synchrotron tomography
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DOI：
10.1016/j.actamat.2017.02.022
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发表时间：
2017-04-15
期刊：
影响因子：
9.4
通讯作者：
Dye, D.
中科院分区：
文献类型：
--
作者：
Azeem, M. A.;Lee, P. D.;Dye, D.
在液-固相转变过程中形成的微结构图案控制着多种材料的性能。我们开发了一种新的方法，能够通过同步加速器层析成像对高温先进合金的凝固过程中形成的微观组织进行原位定量。形成的图案是使用一种方法在4D(3D加时间)内捕捉到的，该方法利用了三个独立的进步：定制的高温环境单元；高X射线对比度合金的开发；以及新的环境封装系统。这一方法在Ni、Fe和Co先进合金系统上进行了演示，揭示了枝晶图案的形成。我们给出了一种新型的高衰减对比度Co-Hf合金中微结构花样演化的详细定量，包括微结构花样和枝晶尖端速度。这些图像被量化，以提供钴合金生长和粗化机制的4D实验数据，这些合金被用于从能源到航空航天的一系列应用。(C)2017 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
The microstructural patterns formed during liquid to solid phase transformations control the properties of a wide range of materials. We developed a novel methodology that enables in situ quantification of the microstructures formed during solidification of high temperature advanced alloys via synchrotron tomography. The patterns formed are captured in 4D (3D plus time) using a methodology which exploits three separate advances: a bespoke high temperature environment cell; the development of high X-ray contrast alloys; and a novel environmental encapsulation system. This methodology is demonstrated on Ni, Fe, and Co advanced alloy systems, revealing dendritic pattern formation. We present detailed quantification of microstructural pattern evolution in a novel high attenuation contrast Co-Hf alloy, including microstructural patterning and dendrite tip velocity. The images are quantified to provide 4D experimental data of growth and coarsening mechanisms in Co alloys, which are used for a range of applications from energy to aerospace. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.