Thermal stability of TiAlN/CrN multilayer coatings studied by atom probe tomography

Title
Thermal stability of TiAlN/CrN multilayer coatings studied by atom probe tomography
Authors
최벽파Ivan Povstugar안재평Aleksander KostkaDierk Raabe
Keywords
Hardcoatings; multilayers; atom probe tomography; Thermal stability
Issue Date
2011-05
Publisher
Ultramicroscopy
Citation
VOL 111, NO 6, 518-523
Abstract
This study is about the microstructural evolution of TiAlN/CrN multilayers (with a Ti:Al ratio of 0.75:0.25 and average bilayer period of 9 nm) upon thermal treatment. Pulsed laser atom probe analyses were performed in conjunction with transmission electron mivroscopy and X-ray diffraction. The layer are found to be thermally stable up to 600℃. At 700℃ TiAlN layers begin to decompose into Ti-and Al-rich nitride layers in the out-of-plane direction. Further increase in temperature to 1000℃ leads to a strong decomposition of the multilayer structure as well as grain coarsening. Layer dissolution and grain coarsening appear to begin at the surface. Domains of AlN and TiCrN larger than 100 nm are found, together with smaller nano-sized AlN precipitates within the TiCrN matrix. Fe and V impurities are detected in the multilayers as well, which diffuse from the steel substrate into the coating along columnar grain boundaries.
URI
http://pubs.kist.re.kr/handle/201004/39178
ISSN
0304-3991
Appears in Collections:
KIST Publication > Article
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