What is it about?

The mechanical properties of magnesium alloys depend on the alloy grain size and texture, and the recrystallized grains significantly affect the plastic deformation process, that is, grain refinement affects the mechanical properties of magnesium alloys by improving their plastic deformation properties. This study aimed to obtain a complete dynamic recrystallization microstructure and prove that good performance of magnesium alloy sheets with fine grains can be obtained to improve the rolling deformability.

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Why is it important?

(1)A constitutive model coupled stress variable was established for the unidirectional solidification sheet of AZ31 magnesium alloy and to predict the DRX microstructural evolution of AZ31 magnesium alloys. The approach provides a multi-scale modeling to bridge the macroscopic rolling process analysis with the microscopic DRX activities and achieve a weakening texture of magnesium alloy sheet. (2)By the bulging nucleation mechanism of DRX and coupling the CA method and the metallurgical principles, the grain refinement of DRXed grains was successfully acquired. The appropriate parameters during the rolling process, which were discussed in detail in the paper, are helpful for enhancing the percentage of DRX. The recrystallized microstructure obtained via the CA method is in good agreement with the EBSD experiment.

Perspectives

Compared with high-level faulted energy metals such as aluminium alloys, magnesium alloys are prone to dynamic recrystallization during hot deformation due to fewer slip systems, lower stacking fault energy and faster grain boundary diffusion. As an important softening and grain refinement mechanism, dynamic recrystallization plays an important role in controlling the deformation structure, enhancing the plastic forming ability and improving the mechanical properties of magnesium alloys.

Ming Chen
University of Science and Technology Liaoning

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This page is a summary of: Recrystallization Microstructure Prediction of a Hot-Rolled AZ31 Magnesium Alloy Sheet by Using the Cellular Automata Method, Mathematical Problems in Engineering, September 2019, Hindawi Publishing Corporation, DOI: 10.1155/2019/1484098.
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