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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Twinning during hot compression of ZK30+0.3Yb magnesium alloy
YE Cheng-wu(叶呈武), LIU Zhi-yi(刘志义), 
ZHANG Kun(张 坤), ZHENG Qing-chun(郑青春)

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract: The twinning process of ZK30+0.3Yb magnesium alloy was studied. The results show that twinning occurs at the initial stage of deformation, and decreases during further deformation. The original grain is fragmented after small straining. It is investigated that the twinning boundary activates the occurrence of the non-basal slip system due to the stress concentration at the vicinity of twin boundary introduced by the dislocation pile-ups at the vicinity of twinning boundary. The rearrangement of dislocation after dislocation climb introduces new grain boundary. Simultaneously, twinning occurs to form “polygonization” due to the stress concentration relaxation, and the “polygonization” will transform into low angle boundary to refine the original grain under the shear stress with further straining.

 

Key words: magnesium alloys; twinning; dislocation rearrangement; grain refinement 

ISSN 1672-7029
CN 43-1423/U

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