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| THE EFFECT OF {10¯11}–{10¯12} DOUBLE TWINNING ON THE MICROSTRUCTURE, TEXTURE AND MECHANICAL PROPERTIES OF AZ31 MAGNESIUM ALLOY SHEET DURING ROLLING DEFORMATION |
| LUO Jinru 1, LIU Qing 1,2, LIU Wei 1, Godfrey Andrew 1 |
1) Department of Materials Science and Engineering, Tsinghua University, Beijing 100084
2) School of Materials Science and Engineering, Chongqing University, Chongqing 400044 |
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Cite this article:
. THE EFFECT OF {10¯11}–{10¯12} DOUBLE TWINNING ON THE MICROSTRUCTURE, TEXTURE AND MECHANICAL PROPERTIES OF AZ31 MAGNESIUM ALLOY SHEET DURING ROLLING DEFORMATION. Acta Metall Sin, 2011, 47(12): 1567-1574.
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Abstract {10¯11}–{10¯12} double twin is the most common twin type being observed in the rolled AZ31 magnesium alloy, especially at low or moderate rolling temperature. Four types of rolled AZ31 magnesium alloy sheets were produced by rolling strong basal textured AZ31 plates at 150 ℃ and 300 ℃ respectively through different rolling paths by two passes till total reduction 17%. The rolling paths are normal and cross rolling respectively: the rolling directions of the two passes for normal rolling are mentally paralleled while perpendicular to each other for the cross rolling. Sheets are characterized in terms of microstructure and texture using optical microscope and scanning–electron microscope equipped with EBSD detector, and their mechanical performances are measured by uniaxial tensile tests at room temperature and a strain rate of 0.001 s−1. Tensile samples are cut parallel or perpendicular to the final rolling direction to obtain the mechanical anisotropies. The effects of the {10¯11}–{10¯12} double twins occurred during rolling onto the sheets the microstructure, texture and mechanical properties of the rolled sheets are discussed and related to each other. The results show that proportion of {10¯11}–{10¯12} double twins varies widely in different rolled sheets, which are determined by the rolling temperature. The twins in different rolled sheets are arranged in different ways. In the normal rolled sheets, the traces of twins are approximately perpendicular to the final rolling direction, while in the cross rolled sheets there are both traces of twins parallel and to the final directions. This phenomenon is related to the variant selection of twinning during rolling deformation. And the variant selection law is related to the rolling direction. For the same reason, the textures of twins in the rolled sheets produced through different paths are different. The textures of twins will add onto the bulks, and increases the textural difference between the bulks. The differences between mechanical properties of the rolled sheets are also related to the different textures and microstructures of the sheets caused by twins.
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Received: 08 August 2011
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| Fund: Supported by National Basic Research Program of China (No.2007CB613703) |
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