[eta] to G phase transformation in electrodeposited iron-zinc alloy coatings

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

OSTI ID:7175473

Drewien, C A ^[1]; Goldstein, J I ^[2]; Marder, A R ^[3]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. Univ. of Massachusetts, Amherst, MA (United States)
3. Lehigh Univ., Bethlehem, PA (United States). Materials Science and Engineering Dept.

The [eta] to G phase transformation in electrodeposited iron-zinc alloy coatings is a rapid diffusional phase transformation occurring in the nanometer-scale microstructure of the coatings. Iron-supersaturated zinc, or [eta] phase, undergoes a decomposition process to an iron-deficient [Gamma]-like, or G, phase at temperatures near 150 C. The phase transformation is preceded by a polygonization process, driven by strain energy and/or supersaturation in the material. The G phase nucleates on boundaries within the [eta] phase and grows into 30 to 80-nm equiaxed grains. The activation energy for the transformation varies with iron content, which may indicate that solute effects influence boundary diffusion of zinc.

• OSTI ID: 7175473
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:6; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
COATINGS
CORROSION PROTECTION
CRYSTAL-PHASE TRANSFORMATIONS
DATA
ELECTRODEPOSITED COATINGS
EXPERIMENTAL DATA
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MICROSTRUCTURE
NUMERICAL DATA
PHASE TRANSFORMATIONS
STEELS
ZINC ALLOYS