Effects of strain cycling on buckling, cracking and spalling of a thermally grown alumina on a nickel-based bond coat

被引：97

作者：

Wang, JS ^{[1
]}

Evans, AG ^{[1
]}

机构：

[1] Harvard Univ, Dept Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

ACTA MATERIALIA | 1999年 / 47卷 / 02期

关键词：

D O I：

10.1016/S1359-6454(98)00328-0

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Strain cycling has been used to study various events that occur in association with an alumina thin layer thermally grown on a Ni-based bond coat. There are three main findings. (i) Buckles propagate with a growth per cycle suggestive of effects of cycling on the friction acting at the separated interfaces. (ii) Cracking of the thermally grown oxide (TGO) occurs within buckles having high ellipticity, subject to a flexural strength typical of fine-grained Al2O3, With Small stressed volume. Such cracking has implications for oxygen ingress and rapid degradation. (iii) Spalling occurs preferentially in those buckles that previously crack. The measurements are analyzed using the mechanics of buckle propagation, bending and kinking. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：699 / 710

页数：12

共 33 条

[1]

THERMAL BARRIER COATING LIFE AND ISOTHERMAL OXIDATION OF LOW-PRESSURE PLASMA-SPRAYED BOND COAT ALLOYS [J].