%0 Journal Article
%T ANOMALOUS STRAIN RATE DEPENDENCE OF FLOW STRESS IN TiAl INTERMETALLIC COMPOUNDS<br>TiAl金属间化合物反常应变速率效应的研究
%A WANG Liming
%A ZHU Dong
%A YAO Mei
%A CAI Qigong
%A ZOU Dunxu State Key Laboratory for Fatigue
%A Fracture of Materials
%A Academia Sinica
%A Shenyang
%A Central Iron
%A Steel Research Institute
%A Ministory of Metallurgical Industry
%A Beijing
%A <br>王理明
%A 祝东
%A 姚枚
%A 蔡其巩
%A 邹敦叙
%J 金属学报
%D 1992
%I 
%X Plastic deformation of TiAl and TiAl-V intermetallic compounds has been stu- died by compression experiment at various temperatures and strain rates. Results show that the plastic deformation in distinct temperature range is principally controlled by the mechanisms of Perierls-Nabarro, cross slip and creep of dislocation. For TiAl-V alloy deformed at a range of 600--700 K, the negative strain rate dependence of flow stress was observed, i. e., the more the plastic strain is, the more the negative dependence will be. A possible mechanism of the anomaly could be interpreted by thermal activation of dislocation cross slipping. The effects of tempera- ture and strain rate on work-hardening exponent were also studied and discussed.
%K TiAl
%K intermetallic compound
%K strain rate
%K cross-slip<br>TiAl
%K 金属间化合物
%K 应变速率效应
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=A7B49C4952465C18791667DB27CC4490&yid=F53A2717BDB04D52&vid=D3E34374A0D77D7F&iid=E158A972A605785F&sid=1371F55DA51B6E64&eid=1AE5323881A5ECDC&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=3