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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.45  No.7 (2004)  >  pp.2326-2331

MATERIALS TRANSACTIONS
<<Previous article Vol.45  No.7 (2004)   pp.2326 - 2331 Next article>>

In-situ Observation of Growth Behavior of Fe-Zn Intermetallic Compounds at Initial Stage of Galvannealing Process

Akira Taniyama1), Masahiro Arai1), Toru Takayama1) and Masugu Sato2)
1) Corporate Research and Development Laboratories, Sumitomo Metal Industries, Ltd.
2) Japan Synchrotron Radiation Research Institute


In-situ observation was performed with X-ray diffraction technique using synchrotron radiation to reveal growth behavior of the Fe-Zn intermetallic compounds, the ζ and δ1 phases, at the initial stage of galvannealing process. The galvanized sample and electroplated sample were used in the observation. The diffraction peak profiles were successfully obtained at intervals of 1 second with heating the sample, and the growth of the Fe-Zn intermetallic compounds was observed dynamically. In the galvanized sample including a small amount of aluminum in the coating, there was an incubation period of 7 seconds before the δ1 phase started to grow. The thickness estimated with the peak intensity of the δ1 phase increased in proportion to the square root of heating time when the incubation period was taken into account. In the electroplated sample including no aluminum in the coating, the thickness of ζ phase increased in proportion to the square root of heating time. The δ1 phase started to grow as soon as the ζ phase occupied the entire coating. The thickness of the δ1 phase also increased in proportion to the square root of heating time. These results suggest that that the growth behavior of the δ1 phase at the initial stage of galvannealing is dominated by the interdiffusion between Fe and Zn, neither by interfacial reaction nor by autocatalytic reaction whether the coating contains aluminum or not.


Keyword:
galvannealing, iron-zinc intermetallic compound, growth behavior, in-situ observation, synchrotron radiation

Received: March 05, 2004
Accepted: May 27, 2004 , Published online: June 24, 2005
Copyright (c) 2005 The Japan Institute of Metals

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