|About this Abstract
||2011 TMS Annual Meeting & Exhibition
||Surfaces and Heterostructures at Nano- or Micro-Scale and Their Characterization, Properties, and Applications
||Nature of the B2 Phase in Sputter-Deposited 304 Stainless Steel + 10 wt.% Al Coatings
||U.M.R. Seelam, C. Suryanarayana, T. Ohkubo, Kazuhiro Hono, N. S. Cheruvu
|On-Site Speaker (Planned)
A Fe-18Cr-8Ni-10Al (wt.%) coating was deposited on a 304-type austenitic stainless steel substrate by magnetron sputtering technique using SS304 and Al targets. The as-deposited coatings were characterized by XRD, SEM, TEM, and 3DAP techniques. The coating consists of columnar grains with alpha-ferrite and B2 phase particles uniformly distributed. It also has a deposition-induced layered structure with two alternate layers (of 3.2 nm wavelength), one rich in Fe and Cr, and the other rich in Al and Ni. Conventional TEM techniques were able to provide the general microstructural features of the coating, but it was not able to determine the exact nature and chemistry of the B2 phase; 3DAP studies helped in unambiguously identifying that the B2 phase is NiAl. Based on the above results, it was concluded that NiAl is the preferred phase over FeAl, further correlated with the heats of mixing among Fe, Ni, and Al elements.
||Planned: A CD-only volume