The dynamic recrystallization mechanism and microstructure evolution in an extruded AZ31 rod during hot torsion deformation at 150 °C were investigated. It indicated that several dynamic recrystallization mechanisms were initiated during hot torsion deformation, including discontinuous DRX (DDRX), continuous DRX (CDRX) and twinning induced DRX (TDRX). With increasing strain, CDRX became the dominant DRX mechanism and contributed to a remarkable refinement of grains. A gradient distribution of dynamic recrystallization grains on the cross section of samples generated due to the gradient shear strain in twisted samples. Hot torsion can also arouse the c-axis of grains to rotate towards the extrusion direction. From low strain to high strain, the recrystallized grains exhibited a similar texture development with the deformed grains. The relevant mechanisms were revealed.
Magnesium alloys Hot torsion Dynamic recrystallization Texture
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This project was financially supported by the Fundamental Research Funds for the Central Universities (SWU117002), the National Natural Science Foundation of China (51601154 and 51501045) and Natural Science Foundation of Guizhou Province (Grant No.  2067).