GRAIN-BOUNDARY SLIDING MEASUREMENTS IN AL2O3 BY MACHINE VISION PHOTOGRAMMETRY

被引:10
作者
BLANCHARD, CR
PAGE, RA
机构
[1] Southwest Research Institute, San Antonio, 78228-0510, TX
关键词
D O I
10.1007/BF01124658
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The nucleation, growth and coalescence of grain-boundary cavities is the primary damage mechanism observed during creep of structural ceramics. Furthermore, grain-boundary sliding (GBS) has been identified as the driving force process. Although the creep characteristics of structural ceramics have been extensively studied, very little is known about the details of GBS during creep and how GBS relates to cavitation kinetics. This paper presents the results of a study using a machine vision system to measure Mode II GBS displacements in a Lucalox Al2O3. Specifically, sliding displacements as large as 0.4-mu-m were measured. The measured displacements indicate that some grain boundaries experienced shear strains and strain rates of 4200% and 2.3 x 10(-2) s-1, respectively. The techniques utilized for these measurements are described in detail, and data gathered during a 2 1/2 compressive creep test under a stress of 138 MPa at 1600-degrees-C are presented and discussed.
引用
收藏
页码:3165 / 3170
页数:6
相关论文
共 33 条
[1]   DIRECT OBSERVATIONS OF GRAIN-BOUNDARY SLIDING IN BI-CRYSTALS OF SODIUM CHLORIDE AND MAGNESIA [J].
ADAMS, MA ;
MURRAY, GT .
JOURNAL OF APPLIED PHYSICS, 1962, 33 (06) :2126-&
[2]  
AIGELTINGER EH, 1974, J MATER SCI, V9, P644, DOI 10.1007/BF02387539
[3]   HIGH-TEMPERATURE DEFORMATION OF ALUMINA DOUBLE BICRYSTALS [J].
BECHER, PF ;
PALMOUR, H .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1970, 53 (03) :119-&
[4]   CREEP-BEHAVIOR AND GRAIN-BOUNDARY SLIDING IN POLYCRYSTALLINE [J].
CANNON, WR ;
SHERBY, OD .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1977, 60 (1-2) :44-47
[5]   ELECTRON-DIFFRACTION AND MICROSCOPY STUDIES OF THE STRUCTURE OF GRAIN-BOUNDARIES IN AL2O3 [J].
CARTER, CB ;
KOHLSTEDT, DL ;
SASS, SL .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1980, 63 (11-1) :623-627
[6]   DRIVING FORCES FOR COMPOSITE INTERFACE FATIGUE CRACKS [J].
CHAN, KS ;
DAVIDSON, DL .
ENGINEERING FRACTURE MECHANICS, 1989, 33 (03) :451-466
[7]  
CHAN KS, 1990, J MATER SCI, V20, P4622
[8]   HIGH-TEMPERATURE MECHANICAL-PROPERTIES OF SINGLE-PHASE ALUMINA [J].
CHOKSHI, AH ;
PORTER, JR .
JOURNAL OF MATERIALS SCIENCE, 1986, 21 (02) :705-710
[9]   CREEP OF POLYCRYSTALLINE ALUMINUM OXIDE [J].
COBLE, RL ;
GUERARD, YH .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1963, 46 (07) :353-354
[10]   DUALITY IN THE CREEP-RUPTURE OF A POLYCRYSTALLINE ALUMINA [J].
DALGLEISH, BJ ;
SLAMOVICH, EB ;
EVANS, AG .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1985, 68 (11) :575-581