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TEM Characterization of Pt plus gamma '-Ni3Al+gamma-Ni/CMSX-4 Coating Microstructure

TitleTEM Characterization of Pt plus gamma '-Ni3Al+gamma-Ni/CMSX-4 Coating Microstructure
Publication TypeJournal Article
Year of Publication2012
AuthorsCao GH, Yao PP, Russell AM
Journal TitleRare Metal Materials and Engineering
Volume41
Pages847-850
Date Published05
Type of ArticleArticle
ISBN Number1002-185X
Accession NumberWOS:000305303500020
Keywordsalloys, behavior, design, gamma '-Ni3Al+gamma-Ni coating, interdiffusion, oxidation, phase, platinum, single-crystal superalloys, THERMAL BARRIER COATINGS, topologically close-packed (TCP) phase, transmission electron microscopy, twinning
Abstract

Pt+gamma'-Ni3Al+gamma-Ni/CMSX-4 coatings were fabricated by Pt electroplating on CMSX-4 single crystal superalloys substrate and followed by an aluminizing pack cementation process. The microstructure of the Pt+gamma'-Ni3Al+gamma-Ni/CMSX-4 coating was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). TEM investigation showed that {111} twinning exists in the gamma'-Ni3Al phase, Pt was mainly distributed in the gamma'-Ni3Al. Precipitates were observed in the coatings. Selected area electron diffraction (SAED) reveals that the precipitate was the hexagonal topologically close-packed (TCP) mu phase with lattice parameters alpha=0.473 nm, and c=2.565 nm. Twin domains parallel to (001) and (10 (2) over bar) twinning were found in the mu phase and their formations were discussed.
URL<Go to ISI>://WOS:000305303500020
Alternate JournalRare Metal Mat. Eng.