In situ observation of solidification phenomena in Al–Cu and Fe–Si–Al alloys
In situ observation of solidification phenomena in Al–Cu and Fe–Si–Al alloys
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DOI：
10.1179/136404609x368118
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发表时间：
2009-08
影响因子：
1.4
通讯作者：
H. Yasuda;Y. Yamamoto;N. Nakatsuka;M. Yoshiya;T. Nagira;A. Sugiyama;I. Ohnaka;K. Uesugi;K. Umetani
中科院分区：
文献类型：
--
作者：
H. Yasuda;Y. Yamamoto;N. Nakatsuka;M. Yoshiya;T. Nagira;A. Sugiyama;I. Ohnaka;K. Uesugi;K. Umetani
同步辐射可以观察金属合金的凝固过程。报道了Al-Cu合金（5、10和15 wt-%Cu）的原位凝固观察。从平面界面进行定向凝固时，15%和10%Cu合金的枝晶臂常出现形核和断裂现象。相比之下，5%Cu合金很少出现形核和破碎现象。凝固前沿的形核和糊状区的碎裂与合金成分密切相关。本文还对Fe-10Si-0·5Al （at-%）合金的凝固进行了原位观察。利用该技术可以清楚地观察到δ-Fe的枝晶生长。x射线成像技术的发展使人们能够观察到各种传统铸造合金（如Al、Ni和Fe合金）的凝固，并将越来越多地用于研究凝固现象。
Abstract Synchrotron radiation enables the observation of solidification in metallic alloys. In situ observations of solidification for Al–Cu alloys (5, 10 and 15 wt-%Cu) are reported. Nucleation and fragmentation of dendrite arms were often observed in the 15 and 10%Cu alloys when unidirectional solidification was performed from the planar interface. In contrast, nucleation and fragmentation were rarely observed in the 5%Cu alloys. The nucleation ahead of the solidifying front and the fragmentation in the mushy region strongly depended on alloy composition. This paper also presents in situ observation of solidification of Fe–10Si–0·5Al (at-%) alloys. The dendritic growth of δ-Fe was clearly observed using this technique. The development of X-ray imaging techniques enables the solidification of various conventional cast alloys such as Al, Ni and Fe alloys to be observed and will be increasingly used to investigate solidification phenomena.