Structural Characterization of Sputter-Deposited 304 Stainless Steel+10 wt pct Al Coatings

Authors

U. M. R. Seelam; C. Suryanarayana; H. Heinrich; T. Ohkubo; K. Hono;N. S. Cheruvu

Comments

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Abbreviated Journal Title

Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.

Keywords

OXIDATION BEHAVIOR; SPECIMEN PREPARATION; CYCLIC OXIDATION; ALLOY; COATINGS; HOT-CORROSION; ADHESION; PHASE; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

An SS304 + 10 wt pct Al (with a nominal composition of Fe-18Cr-8Ni-10Al by wt pct and corresponding to Fe-17Cr-6Ni-17Al by at. pct) coating was deposited on a 304-type austenitic stainless steel (Fe-18Cr-8Ni by wt pct) substrate by the magnetron sputter-deposition technique using two targets: 304-type stainless steel (SS304) and Al. The as-deposited coatings were characterized by X-ray diffraction, transmission electron microscopy, and three-dimensional (3-D) atom probe techniques. The coating consists of columnar grains with alpha ferrite with the body-centered cubic (bcc) (A2) structure and precipitates with a B2 structure. It also has a deposition-induced layered structure with two alternative layers (of 3.2 nm wavelength): one rich in Fe and Cr, and the other enriched with Al and Ni. The layer with high Ni and Al contents has a B2 structure. Direct confirmation of the presence of B2 phase in the coating was obtained by electron diffraction and 3-D atom probe techniques.

Journal Title

Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science

Volume

43A

Issue/Number

8

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

2945

Last Page

2954

WOS Identifier

WOS:000305732900051

ISSN

1073-5623

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