Formation of the ζ phase at an interface between an Fe substrate and a molten 0.2 mass% Al-Zn during galvannealing

T. Kato, K. Nunome, Kenji Kaneko, H. Saka

Research output: Contribution to journalArticle

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Abstract

An interstitial free (IF) steel was dipped in a bath of molten Zn containing 0.2 mass% Al. The asdipped (galvanized) steel was then annealed above the melting point of Zn (galvannealed), say at 773 K, for a period ranging from 1 to 30 s. Evolution of the microstructure of the Zn-containing coating was examined by transmission electron microscopy (TEM) and the chemical composition around the Zn(Al)/Fe interface was analyzed by energy dispersion spectroscopy (EDS) in a dedicated scanning transmission electron microscope (STEM). In the as-dipped (galvanized) steel a continuous layer of Fe2Al5 existed at the Zn(Al)/Fe interface, but no Fe-Zn intermetallic compounds were observed. Galvannealing at 773 K for 1 s resulted in the formation of the ζ phase at the Zn(Al)/Fe2Al5 interface, which grew at the expense of the Zn(Al) coating during the subsequent galvannealing. Possible mechanisms of nucleation of Fe-Zn intermetallic compounds are discussed.

Original languageEnglish
Pages (from-to)2257-2262
Number of pages6
JournalActa Materialia
Volume48
Issue number9
DOIs
Publication statusPublished - May 29 2000
Externally publishedYes

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Steel
Molten materials
Intermetallics
Substrates
Coatings
Melting point
Nucleation
Electron microscopes
Spectroscopy
Transmission electron microscopy
Scanning
Microstructure
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Formation of the ζ phase at an interface between an Fe substrate and a molten 0.2 mass% Al-Zn during galvannealing. / Kato, T.; Nunome, K.; Kaneko, Kenji; Saka, H.

In: Acta Materialia, Vol. 48, No. 9, 29.05.2000, p. 2257-2262.

Research output: Contribution to journalArticle

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