A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an A1-15Cu alloy
A synchrotron X-ray radiography study of dendrite fragmentation induced by a pulsed electromagnetic field in an A1-15Cu alloy
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Al-15Cu 合金中脉冲电磁场引起的枝晶碎裂的同步加速器 X 射线照相研究
DOI：
10.1016/j.actamat.2014.02.024
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发表时间：
2014-05-15
期刊：
影响因子：
9.4
通讯作者：
Grant, P. S.
中科院分区：
文献类型：
--
作者：
Liotti, E.;Lui, A.;Grant, P. S.
基于同步辐射X射线成像技术，研究了脉冲电磁场对枝晶破碎行为的影响，该技术涉及通过放置在静磁场中的箔试样的振荡电流。在所有情况下，将脉冲电磁场施加到Al-15 wt.% Cu枝晶导致枝晶破碎率增加。即使在高固相率下，一次和二次枝晶臂之间的枝晶间液体的诱导运动也会导致局部温度浓度曲率平衡的不稳定性和最脆弱微区的快速重熔。新的原位方法为优化脉冲电磁场参数以提高特定合金和铸造条件下的晶粒细化性能提供了基础。皇冠版权所有（C）2014由爱思唯尔有限公司代表Acta Materialia Inc.出版。All rights reserved.
An in situ technique for studying the effect of a pulsed electromagnetic field on dendrite fragmentation behavior based on synchrotron X-ray imaging has been developed, involving the passage of an oscillating current through a foil specimen placed in a static magnetic field. In all cases, the application of a pulsed electromagnetic field to an array of Al-15 wt.%Cu dendrites led to an increase in dendrite fragmentation rate. The induced movement of inter-dendritic liquid between the primary and secondary dendrite arms even at high solid fraction led to instabilities in the local temperature concentration curvature equilibrium and the rapid remelting of the most vulnerable microregions. The new in situ methodology provides a basis for the optimization of pulsed electromagnetic field parameters to enhance grain refining performance for specific alloys and casting conditions. Crown Copyright (C) 2014 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.