{}-{} Double twinning in magnesium

Abstract

It is demonstrated that metalworking processes performed at different temperatures can lead to the - double twinning. This twinning mode has been observed during direct extrusion of the coarse-grained Mg-0.3at.%Al alloy at 433 K and analysed in detail on room-temperature rolled magnesium single crystal with the c-axis parallel to transverse direction and the a-axis parallel to rolling direction. The - double twins originated during initial stage of the formation on coarse-grained and single-crystalline structure.

Keywords:

• twinning
• magnesium alloys
• metal forming
• electron backscattering diffraction

Acknowledgements

The authors thank P. Šedá from Institute of Physics for single-crystal preparation and T. Mukai from NIMS (Tsukuba, Japan) for direct extrusion experiment. Financial support from the Academy of Sciences of the Czech Republic (contract nos. KAN300100801 and IAA100100920) is gratefully acknowledged.