Premium
Atomic‐Scale Structural and Chemical Study of Columnar and Multilayer Re–Ni Electrodeposited Thermal Barrier Coating
Author(s) -
Baik SungIl,
Duhin Alla,
Phillips Patrick J.,
Klie Robert F.,
Gileadi Eliezer,
Seidman David N.,
Eliaz Noam
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500578
Subject(s) - materials science , atomic units , electroplating , coating , scanning transmission electron microscopy , transmission electron microscopy , layer (electronics) , chemical bond , scanning electron microscope , atom probe , composite material , nanotechnology , chemistry , physics , organic chemistry , quantum mechanics
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 single‐bath 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.