Deformation-Induced Recrystallization of Magnesium Single Crystals at Ambient Temperature

17th International Conference on Textures of Materials

材料科学;物理学

Molodov, K.D.^1 ; Al-Samman, T.^1 ; Molodov, D.A.^1

Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, Germany^1

关键词: Continuous dynamic recrystallization;    Deformation twin;    Grain orientation;    Magnesium single crystals;    Micro-structure evolutions;    Orientation imaging microscopy;    Plane strain compression;    Soft orientation;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012014/pdf
DOI  :  10.1088/1757-899X/82/1/012014

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Specially oriented magnesium single crystals were subjected to plane strain compression along thedirection in c-axis extension at ambient temperature. The samples exhibited outstanding formability deforming up to a logarithmic final strain of -1. Investigations by optical and orientation imaging microscopy revealed that massive {1012} extension twinning at low strains consumed the whole sample and resulted in new soft orientations for slip. Observations also indicated that additional twinning took place in the completely twinned matrix by secondary and tertiary twinning events. At advanced stages of deformation newly formed, equiaxed small grains were observed within numerous bands related to former deformation twins. These "recrystallized" grains characterized by a low grain orientation spread of less than 1° generated new orientations, which led to a substantial weakening and randomization of the texture during deformation up to very large strains. The reported results in this paper are discussed with regard to the microstructure evolution arising from multiple twinning and continuous dynamic recrystallization at room temperature.