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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.52  No.8 (2011)  >  pp.1585-1588

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Law of Atomic Motion during {10\bar11} Twinning in Magnesium Alloys

Shan Jiang1)2)3), Tianmo Liu1)2), Cheng Chen1)2) and Xianquan Jiang3)
1) College of Materials Science and Engineering, Chongqing University
2) National Engineering Research Center for Magnesium Alloys, Chongqing University
3) Chongqing Research Center for Advanced Materials, Chongqing Academy of Science and Technology

Twin types in a room-temperature compressed magnesium alloy (Mg-3Al-1Zn) sample were identified by using electron backscattered diffraction (EBSD) technique, and the results indicate that most of the twins are {10\bar12} twins and only a few of them are {10\bar11} twins. In order to study the law of atomic motion in the {10\bar11} twinning, we calculated the displacement vectors of the twinning atoms in the {10\bar11} twinning and found that the atomic motion can be explained through a model named quadrangular prism-shaped atomic group (QPAG). In the QPAG model there exist two types of alternately distributed QPAG units totally. Though the rotational angle of the two types of QPAG units in the {10\bar11} twinning is smaller than in the {10\bar12} twinning, the relative displacement magnitude in the {10\bar11} twinning is larger than in the {10\bar12} twinning due to its more complicated atomic motion, and this should be the reason that the {10\bar11} twinning is harder to occur than the {10\bar12} twinning.

magnesium alloys, twinning, atomic motion, modeling

Received: January 06, 2011
Accepted: May 10, 2011 , Published online: July 25, 2011
Copyright (c) 2011 The Japan Institute of Metals



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