Real-Time Observation of AZ91 Solidification by Synchrotron Radiography
Real-Time Observation of AZ91 Solidification by Synchrotron Radiography
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DOI：
10.1007/978-3-319-52392-7_82
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
G. Zeng;K. Nogita;S. Belyakov;J. Xian;S. McDonald;K. Yang;H. Yasuda;C. Gourlay
中科院分区：
文献类型：
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作者：
G. Zeng;K. Nogita;S. Belyakov;J. Xian;S. McDonald;K. Yang;H. Yasuda;C. Gourlay
用150微米厚样品的时间分辨同步辐射照相技术研究了AZ91的等轴凝固过程。在冷却速度为5K/min的凝固过程中，观察和分析了初生Al8Mn5和α-Mg枝晶的生长情况。结合热力学计算，从同步辐射图像定量分析中提取了AZ91凝固的形态、成分和动力学信息。α-Mg枝晶的生长基本不依赖于周围的Al8Mn5颗粒。溶质分配主要发生在枝晶粗化阶段，在AZ91凝固后期仍为液态通道的区域，研究了锌/铝溶质堆积现象。
The equiaxed solidification of AZ91 has been studied by time-resolved synchrotron radiography of 150 µm thick samples. Primary Al8Mn5and α-Mg dendrite growth has been observed and analysed during solidification at a cooling rate of 5 K/min. Morphological, compositional and kinetic information of AZ91 solidification has been extracted from quantitative image analysis on synchrotron radiographs combined with thermodynamic calculations. α-Mg dendrites appeared to grow largely independently of the surrounding Al8Mn5particles. Solute partitioning mainly occurred during the dendrite coarsening stage and Zn/Al solute build-up was studied in a region that remains a liquid channel until a late stage of AZ91 solidification.