Crack propagation and stress distribution in binary and ternary directionally solidified eutectic ceramics

被引：31
|
作者：
Perriere, L. [1 ,2 ]
Valle, R. [1 ]
Carrere, N. [1 ]
Gouadec, G. [3 ]
Colomban, Ph. [3 ]
Lartigue-Korinek, S. [2 ]
Mazerolles, L. [2 ]
Parlier, M. [1 ]
机构：
[1] ONERA DMSC, F-92322 Chatillon, France
[2] Univ Paris Est, CNRS, ICMPE, UMR 7182, F-94320 Thiais, France
[3] Univ Paris 06, CNRS, LADIR, UMR 7075, F-94320 Thiais, France
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2011年 / 31卷 / 07期
关键词：
Eutectic ceramics; Composites; Al2O3; Fracture; Residual stresses; HIGH-TEMPERATURE STRENGTH; THERMAL-EXPANSION; MECHANICAL-PROPERTIES; ELASTIC-CONSTANTS; RESIDUAL-STRESSES; ZIRCONIA; BEHAVIOR; MELT; MICROSTRUCTURES; SPECTROSCOPY;
D O I：
10.1016/j.jeurceramsoc.2010.09.016
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The development of directionally solidified eutectic (DSE) ceramics for gas turbine applications necessitates improving their strength and toughness. The early stage of crack propagation is investigated in either binary (Al2O3/Y3Al5O12, Al2O3/GdAlO3 and Al2O3/Er3Al5O12) or ternary (Al2O3/Y3Al5O12/ZrO2, Al2O3/GdAlO3/ZrO2 and Al2O3/Er3Al5O12/ZrO2) DSE ceramics. Post-mortem scanning electron microscopy (SEM) examination of biaxial flexure induced cracks revealed crack deflection and branching in the various phases and in the phase boundaries. These observations are correlated to analytical and finite element (FE) internal stress calculations, FE determination of the axial shear stress component in the interfaces in the vicinity of the specimen surface (free-edge effect) and FE calculations of the stress distribution resulting from an applied loading. Results from ruby (Cr3+) fluorescence piezo-spectroscopy measurements are analyzed, taking into account the hydrostatic and plane stress hypotheses. Moreover, transmission electron microscopy (TEM) examinations have confirmed the role of interfaces in the crack nucleation and propagation modes. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1199 / 1210
页数：12
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