Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al2O3/NiAl interface

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F16%3A86099435" target="_blank" >RIV/61989100:27740/16:86099435 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1039/c6cp03609k" target="_blank" >http://dx.doi.org/10.1039/c6cp03609k</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c6cp03609k" target="_blank" >10.1039/c6cp03609k</a>

Result language

angličtina

Original language name

Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al2O3/NiAl interface

Original language description

The profound effects of reactive elements (REs) on the adhesion energy and adhesive strength of the alpha-Al2O3/beta-NiAl interface in thermal barrier coating (TBC) systems have attracted increasing attention because RE-doping has played a significant role in improving the thermal cycling lifetime of TBCs. However, the fundamental mechanism is, so far, not well understood due to the experimental difficulty and theoretical complexity in interface modelling. For this purpose, in the present study we have performed comprehensive density functional theory calculations and information targeted experiments to underline the origin of the surprising enhancement of interface adhesion, stability and mechanical strength of the alpha-Al2O3/beta-NiAl interface by different RE doping levels. Our results suggest that the interface failure firstly appears within the NiAl layer adjacent to the Al-terminated oxide under mechanical loading, while the formation of O-RE-Ni bond pairs at the interface can effectively hinder the interface de-cohesion, providing a higher mechanical strength. By comparing several typical REs, it is observed that Hf can emerge not only with the highest interface adhesion energy, but also the highest mechanical strength; in agreement with our experimental results. By continuously increasing the dopant concentration, the strengthening effect may increase correspondingly, but is limited by the solute solubility. These results shed light into the effect of REs on the stability and strength of the alpha-Al2O3/beta-NiAl interface, providing theoretical guidance for interface design via a combinational analysis of bond topology and electronic structure.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

<a href="/en/project/LM2015070" target="_blank" >LM2015070: IT4Innovations National Supercomputing Center</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Chemistry Chemical Physics

ISSN

1463-9076

e-ISSN

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Volume of the periodical

neuveden

Issue of the periodical within the volume

33

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

22864-22873

UT code for WoS article

000382109300013

EID of the result in the Scopus database

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