Improved mechanical properties of AZ31 magnesium alloy plates by pre-rolling followed by warm compression

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 618; pp. 540 - 545
• Main Authors: Zhang, Hua, Yan, Yan, Fan, Jianfeng, Cheng, Weili, Roven, Hans Jørgen, Xu, Bingshe, Dong, Hongbiao
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 17.11.2014; Elsevier
• Subjects: Applied sciences; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Compressing; Compression; Cross-disciplinary physics: materials science; rheology; Dynamic recrystallization; Elasticity. Plasticity; Exact sciences and technology; Forming; Magnesium alloys; Magnesium base alloys; Materials science; Mechanical properties; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Nucleation; Other heat and thermomechanical treatments; Physics; Plates; Pre-rolling; Production techniques; Rolling; Surface layer; Texture; Treatment of materials and its effects on microstructure and properties; Twin; Compression; Dynamic recrystallization; Magnesium alloys; Pre-rolling; Twin; Grain size; Crystal twin; Nucleation; Elasticity; Rolling; Mechanical properties; Dynamical recrystallization; Crystal defect; Texture; Hardening; Magnesium alloy; Stress effects; Yield strength; Elastic properties; Microstructure; Yield stress; Grain refinement; Elongation (mechanics)
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2014.09.066

AZ31 magnesium alloy plates were processed by pre-rolling followed by warm compression. The corresponding microstructure evolution and mechanical properties were investigated in the present paper. The pre-introduced twins by pre-rolling increased the number of nucleation sites for dynamic recrystallization (DRX) during subsequent warm compression, which resulted in a fine completely recrystallized microstructure. With the increasing warm compression, more grains were recrystallized and the basal texture intensity was greatly strengthened. Finally, the average grain size was significantly refined from 31.9μm to 2.0μm by pre-rolling followed by warm compression. As a result, the AZ31 alloy plates processed by pre-rolling followed by warm compression exhibited higher yield stress and ultimate stress resulting from grain refinement without a reduction in elongation.