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Harper–Dorn and Power‐Law Creep in Single‐Crystalline Magnesium Oxide

 

作者: Oscar A. Ruano,   Jeffrey Wolfenstine,   Jeffrey Wadsworth,   Oleg D. Sherby,  

 

期刊: Journal of the American Ceramic Society  （WILEY Available online 1992）
卷期: Volume 75, issue 7  

页码: 1737-1741

 

ISSN:0002-7820

 

年代: 1992

 

DOI:10.1111/j.1151-2916.1992.tb07190.x

 

出版商: Blackwell Publishing Ltd

 

关键词: magnesia;creep;stress;flow;single crystal

 

数据来源: WILEY

 

摘要:

The creep behavior of single‐crystalline MgO tested in the 〈100〉 direction is reviewed in the temperature range 1300° to 1800°C. At low stresses, the stress exponent is equal to about unity, and the deformation process is attributed to Harper–Dorn creep. At high stresses, the stress exponent is equal to approximately 5 and the deformation process is attributed to dislocation glide controlled by climb. The creep behavior in both regions is successfully predicted by an internal stress model for Harper

 

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