您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 4    December 1999

[PDF Download]    [Flash Online]

    

Interior dislocation behavior in superplastic     deformation of 8090 Al-Li alloy
Liu Zhiyi(刘志义)

Department of Mechanics,University of Petroleum,Dongying 257062,P.R .China

Abstract:The behavior of interior dislocation in superplastic deformation of 8090 Al-Li alloy was investigated. TEM observations showed that at initial stage of deformation,  interior dislocation is created at grain boundary ledge and particle and dislocation slip is quite active; at middle stage of deformation the interior dislocanon is created at triple junction of grain boundaries, which is recovered to form subboundary; up to last stage of deformation, dislocation slip becomes again active, which leads to a dislocation pile-up .The interaction between dislocation and voids does not stop untill last stage of deformation. It is indicated that the dislocation slip is a dominant mechanism of deformation at initial stage of deformation, the dynamic recovery and slip of dislo-
canon can all accomodate grain boudary sliding. Furthermore, the immovable helical dislocations formed by the interaction of screw dislocation with voids increase the distortion energy in crystal lattice, and promote the local dynamic recrystallization at middle stage and last stage of deformation.

 

Key words: dislocations; superplasticity; recovery; recrystallization

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn