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New evidence for the formation and growth mechanism of the intermetallic phase formed at the Al/Fe interface

Published online by Cambridge University Press:  06 December 2013

Kai Zhang ,
Xiufang Bian ,
Yumin Li ,
Yang Liu  and
Chuncheng Yang
Kai Zhang
Affiliation:
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
Xiufang Bian*
Affiliation:
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
Yumin Li
Affiliation:
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
Yang Liu
Affiliation:
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
Chuncheng Yang
Affiliation:
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, People's Republic of China
*
a)Address all correspondence to this author. e-mail: xfbian@sdu.edu.cn
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Abstract

To clarify the underlying mechanism of formation and growth of aluminum coating, the interface microstructures of as-prepared aluminum coating iron were investigated using various experimental methods. The liquid Al–Si, Al–Ge alloys were chosen as the dipping baths. In both cases, the total thickness of the reaction layer is controlled mainly by the well-known diffusion growth of η-Al5Fe2. The melt environment of the Al bath plays a decisive role in the formation and growth of the diffusion layer. The results show that Ge atoms could also decelerate reaction layer growth like Si atoms, which mainly restrain the diffusion of Al atoms. Meanwhile, Ge element represents an abnormal concentration gradient in the η-Al5Fe2 phase. The diverse growth behavior of the diffusion layer is attributed to the strong controlling role of the alloying element in Al baths based on the atomic diffusion and activity analysis.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 23 , 14 December 2013 , pp. 3279 - 3287
Copyright
Copyright © Materials Research Society 2013 

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