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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 4    December 1995

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DISLOCATION BEHAVIOR IN THE SUPERPLASTIC DEFORMATION OF ALLOY Al-Li 2091
Zeng Meiguang; Wu Qiuyun; Zhang Baojin; Zhang Caibei; Cui Jianzhong

P.O.Box 104; Northeastern University; Shenyang 110006

Abstract:The dislocation behavior in the superplastic deformation of alloy Al-Li 2091 has been studied.Both TEM observation and X-ray diffraction analysis revealed that:in the stuidied range of strain,the amount of dislocation in the grain interior decreases with the increase of strain.There also exist such dislocation configurations as network,subgrain boundaries,dislocation poles,helical dislocation,dislocation ring and grain boundary dislocations.In the softening stage of superplastic deformation, with the increase of strain,the velocity of dislocation motion increases and the activation energy of dislocations decreases.

 

Key words: Al-Li alloy superplastic deformation dislocation behavior

ISSN 1672-7029
CN 43-1423/U

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