Materials Transactions Online

Materials Transactions, Vol.58 No.03 (2017) pp.427-432
© 2017 The Japan Institute of Metals and Materials

A Theoretical Study on Atomic Motion during Twinning for Magnesium

Jiejun He1 and Lushu Wu2

1School of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou 550003, PR China
2College of Mechanical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou 550003, PR China

A theoretical analysis based on the calculation on atomic displacement vectors during twinning was performed to investigate twinning mechanism for magnesium and its alloys. After that, a new mode on the atomic motion during twinning was proposed for magnesium and its alloys. During twinning, it was suggested that atomic motion can be accomplished by two steps from a geometrical view: a pre-rotation of quadrangular prism-shaped atomic group units and a subsequent shear. Through this model, atomic motion during twinning in magnesium can be describe using uniform law. It provide a new view for us to explore the twinning mechanism for HCP metals. But it should be pointed out that the two-step motion law in this paper is just an artificial division. In realistic deformation twinning in magnesium, it is possible the rotation and shear happen simultaneously.

[doi:10.2320/matertrans.M2016433]

(Received 2016/12/06; Accepted 2016/12/27; Published 2017/02/25)

Keywords: magnesium, twinning, atomic displacement vectors

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