Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

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 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
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