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- Title
Atomic-Scale Structural and Chemical Study of Columnar and Multilayer Re-Ni Electrodeposited Thermal Barrier Coating.
- Authors
Baik, Sung‐Il; Duhin, Alla; Phillips, Patrick J.; Klie, Robert F.; Gileadi, Eliezer; Seidman, David N.; Eliaz, Noam
- Abstract
Rhenium alloys exhibit a unique combination of chemical, physical, and mechanical properties that makes them attractive for a variety of applications. Herein, we present atomic-scale structural and atomic part-per-million level three-dimensional (3D) chemical characterization of a Re-Ni coating, combining aberration-corrected scanning transmission electron microscopy (STEM) and atom-probe tomography (APT). A unique combination of a columnar and multilayer structure is formed by singlebath dc-electroplating and is reported here for the first time. Alternating thicker Re-rich and thinner Ni-rich layers support a mechanism in which Ni acts as a reducing agent. The multilayers exhibit hetero-epitaxial growth resulting in high residual shear stresses that lead to formation of corrugated interfaces and an outer layer with mud-cracks.
- Subjects
THERMAL barrier coatings; ELECTROPLATING; AERODYNAMIC heating
- Publication
Advanced Engineering Materials, 2016, Vol 18, Issue 7, p1133
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201500578