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Study on the Formation of Reaction Phase to Si Addition in Boron Steel Hot-Dipped in Al–7Ni Alloy
Open AccessArticle

Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al–Ni alloy

Department of Material Science and Engineering, Pusan National University, Busan 46241, Korea
Department of Hybrid Materials and Machining technology, Graduate School of Convergence Science, Pusan National University, Busan 46241, Korea
Author to whom correspondence should be addressed.
Academic Editor: Nelson K. Akafuah
Coatings 2017, 7(11), 195;
Received: 17 October 2017 / Revised: 9 November 2017 / Accepted: 10 November 2017 / Published: 10 November 2017
(This article belongs to the Special Issue Innovative Coatings for Automotive Industry)
PDF [52070 KB, uploaded 13 November 2017]


The formation mechanism of intermetallic compounds formed in boron steel hot-dipped in Al–7Ni (wt %) at 690 °С for 10–120 s was studied by identifying the intermetallic phases and investigating the growth process. Initially, a Fe3O4 oxide layer formed on the steel. The oxide layer separated into multiple layers sporadically; following this, the Al–Ni molten alloy permeated into the region of the oxide layer breakdown and formed the Al9FeNi (T, monoclinic, space group: P21/c) phase on the steel surfaces. The Al9FeNi (T) phase formed from the reaction between the Al–Ni molten alloy and Fe eluted from the steel; this phase not only acts as an Al interdiffusion channel, but also as a barrier for Fe; and facilitates only grain growth without a significant change in thickness. Inside the steel, the Fe2Al5 (η, orthorhombic, space group: Cmcm) phase grows along the c-axis in the [001] direction; and has a long columnar structure. The Fe3AlC (κ, Cubic, space group: Pm3m) phase is formed owing to a reduction in the Al concentration and the simultaneous diffusion and discharge of C toward the steel interface, as C cannot dissolve in the Fe2Al5 (η) phase. View Full-Text
Keywords: hot-dipping; intermetallics formation; diffusion; phase transformation hot-dipping; intermetallics formation; diffusion; phase transformation

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Lee, J.-H.; Yun, J.-G.; Kwak, S.-Y.; Kang, C.-Y. Nucleation and Growth of Intermetallic Compounds Formed in Boron Steel Hot-Dipped in Al–Ni alloy. Coatings 2017, 7, 195.

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