Characterization of oxidation mechanisms in a family of polycrystalline chromia-forming nickel-base superalloys

被引：29

作者：

Lapington, M. T. ^{[1
]}

Crudden, D. J. ^{[2
]}

Reed, R. C. ^{[1
,2
]}

Moody, M. P. ^{[1
]}

Bagot, P. A. J. ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

来源：

ACTA MATERIALIA | 2021年 / 206卷

基金：

英国工程与自然科学研究理事会;

关键词：

Ni-based superalloys; Oxidation; Oxide-film constitution; Atom probe tomography (APT); Grain boundary segregation;

D O I：

10.1016/j.actamat.2021.116626

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The oxidation properties of a family of novel polycrystalline Ni-based superalloys with varying Ti:Nb ratio have been studied, which has shown a correlation between increasing titanium content and accelerated oxidation kinetics. High-resolution characterization of microstructure and chemistry was carried out on the resultant oxide layers using SEM/EDX and Atom Probe Tomography to precisely locate Ti segregation within chromia scales, in order to identify a potential mechanism to explain this correlation. Despite some spread in the data, levels of Ti dissolved in the chromia oxide scales showed little correlation with the nominal Ti concentration or the oxidation properties of each alloy, indicating that oxidation rates are not reliant on dopant levels within bulk chromia. A number of grain boundaries within the oxide scale were targeted for APT analysis, as these are known to act as short-circuit diffusion paths. Segregation of Ti, Nb and Ta to oxide grain boundaries was observed, suggesting that ion transport rates may instead be mediated by dopants present at grain boundaries rather than dissolved within the bulk. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：12

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