Oxidation kinetics and mechanisms of growth of alumina scale on precipitation-hardened Pt-Al-Cr-Ru alloys

被引：12

作者：

Odusote, J. K. ^{[1
,2
,3
]}

Cornish, L. A. ^{[3
,4
]}

Chown, L. H. ^{[3
,4
,5
]}

机构：

[1] Univ Ilorin, Dept Mech Engn, Fac Engn & Technol, Ilorin, Nigeria

[2] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa

[3] Univ Witwatersrand, DST NRF Ctr Excellence Strong Mat, ZA-2050 Johannesburg, South Africa

[4] Univ Witwatersrand, Sch Chem & Met Engn, ZA-2050 Johannesburg, South Africa

[5] MINTEK, Adv Mat Div, ZA-2125 Randburg, South Africa

来源：

CORROSION SCIENCE | 2012年 / 63卷

关键词：

Alloy; Platinum; SEM; XRD; Oxidation; PLATINUM-BASED ALLOYS; OXIDE GRAIN MORPHOLOGY; HIGH-TEMPERATURE; RUTHENIUM ADDITIONS; PROTECTIVE SCALES; BEHAVIOR; SUPERALLOYS; ADHESION; MICROSTRUCTURE; INTERMETALLICS;

D O I：

10.1016/j.corsci.2012.05.018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

To understand the mechanisms of oxidation at different conditions, water-quenched and air-cooled Pt-84:Al-11:Cr-3:Ru-2 (at.%) samples were oxidised in air between 1150 and 1350 degrees C, for up to 100 h. Well-adhering and protective external alpha-Al2O3 scales, which are non-uniform in thickness, formed. Parabolic scaling kinetics were established, and Pt-84:Al-11:Cr-3:Ru-2 (at.%) exhibited slower scale growth rates and lower activation energies, compared to most other Pt-, Ni- and Fe-based superalloys. Mechanisms of alpha-Al2O3 growth were proposed to be mainly by inward diffusion of oxygen along the oxide grain boundaries, with some outward diffusion of aluminium ions along the short circuit paths, such as pores. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：119 / 128

页数：10

共 17 条

[1] TEM studies of Pt-Al-Cr-Ru Alloys
Shongwe, M. B.
Witcomb, M. J.
Cornish, L. A.
Papo, M. J.
JOURNAL OF THE SOUTHERN AFRICAN INSTITUTE OF MINING AND METALLURGY, 2012, 112 (7A) : 551 - 558
[2] TEM studies of Pt-Al-Cr-Ru Alloys
Shongwe, M.B.
Witcomb, M.J.
Cornish, L.A.
Papo, M.J.
Journal of the Southern African Institute of Mining and Metallurgy, 2012, 112 (07) : 551 - 558
[3] High Temperature Oxidation of Pt-Al-Cr-Ru Alloy: Scale Morphology and Adherence
Odusote J.K.
Cornish L.A.
Papo J.M.
Metallography, Microstructure, and Analysis, 2012, 1 (3-4) : 142 - 149
[4] Isothermal oxidation behavior of a precipitation-hardened Pt-base alloy with additions of Al, Cr and Ni
Wenderoth, Markus
Vorberg, Stefan
Fischer, Bernd
Voelkl, Rainer
Glatzel, Uwe
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 2007, 98 (06) : 463 - 467
[5] Application of a thermodynamic database to predict the phases and microstructure of Pt-Al-Cr-Ru alloys
Cornish, L. A.
Suess, R.
Motha, S.
Ukpong, A. M.
Shongwe, M. B.
Witcomb, M. J.
Chown, L. H.
Watson, A.
MATERIALS TODAY-PROCEEDINGS, 2015, 2 (07) : 4090 - 4099
[6] AL-CR-ZR SYSTEM - A BASIS FOR PRECIPITATION-HARDENED ALUMINUM-ALLOYS
ELAGIN, VI
FEDOROV, VM
RUSSIAN METALLURGY, 1977, (05): : 193 - 198
[7] Development of a database for the prediction of phases in Pt-Al-Cr-Ru alloys for high-temperature and corrosive environments: Al-Cr-Ru
Suess, R.
Watson, A.
Cornish, L. A.
Compton, D. N.
JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 476 (1-2) : 176 - 186
[8] Computational design of thermally stable and precipitation-hardened Al-Co-Cr-Fe-Ni-Ti high entropy alloys
Joseph, J.
Senadeera, M.
Chao, Q.
Shamlaye, K. F.
Rana, S.
Gupta, S.
Venkatesh, S.
Hodgson, P.
Barnett, M.
Fabijanic, D.
JOURNAL OF ALLOYS AND COMPOUNDS, 2021, 888
[9] Isothermal Oxidation Behaviour of a Two-Phase γ/γ' Precipitation-Hardened Quaternary Pt-Based Alloys in Air at 1,350 A°C
Odusote, J. K.
Cornish, L. A.
Chown, L. H.
Erasmus, R. M.
OXIDATION OF METALS, 2012, 78 (1-2): : 123 - 143
[10] Isothermal Oxidation Behaviour of a Two-Phase γ/γ′ Precipitation-Hardened Quaternary Pt-Based Alloys in Air at 1,350 °C
J. K. Odusote
L. A. Cornish
L. H. Chown
R. M. Erasmus
Oxidation of Metals, 2012, 78 : 123 - 143

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