MISC

2003年6月

Dislocation structures introduced by high-speed deformation in bcc metals

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
  • K Yasunaga
  • ,
  • M Iseki
  • ,
  • M Kiritani

350
1-2
開始ページ
76
終了ページ
80
記述言語
英語
掲載種別
DOI
10.1016/S0921-5093(02)00697-4
出版者・発行元
ELSEVIER SCIENCE SA

Systematic experiments were carried out over a wide range of strain rate, 10(0)-10(6) s(-1), so as to reveal the deformation mode in bcc crystals, especially at high strain rate. Dislocation structure showed heterogeneous distribution at low strain rates in all three bcc metals examined. At higher strain rates exceeding similar to10(3) s(-1), distribution of dislocations was random, and the formation of, small dislocation loops was observed in V and Nb. In Mo, small dislocation loops were not formed by deformation, even at high strain rates. However, post-deformation annealing of an Mo specimen that had been deformed by 20% at 5 x 10(5) s(-1) produced dislocation loops. The inside-outside contrast method identified these loops to be of vacancy type. These results reveal that in Mo vacancy clusters are not formed directly from the interaction of dislocations, but by the aggregation of vacancies. In V and Nb, the same formation process is believed to occur at high strain rates. These results suggest that the different mode of plastic deformation at high strain rates accompanied by production of vacancies also occurred in bcc metals. (C) 2002 Published by Elsevier Science B.V.

Web of Science ® 被引用回数 : 17

リンク情報
DOI
https://doi.org/10.1016/S0921-5093(02)00697-4
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000182845000014&DestApp=WOS_CPL

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