Abstract
Mg–2Y–0.6Nd–0.6Zr alloy was first deformed by equal channel angular pressing (ECAP), then rolled and deformed under ultralow temperature conditions (liquid nitrogen immersion), and finally annealed. Optical microscopy (OM), electron backscatter diffraction technology (EBSD), and transmission electron microscopy (TEM) were used to analyze the evolution of the multiscale microstructure and changes in the mechanical properties of the alloy under ultralow temperatures and various annealing conditions. The results showed that the alloy treated with ECAP obtained fine grains, and a large number of fine twins were formed during the ultralow-temperature rolling process, which promoted the improvement of its hardness and strength and provided numerous preferential nucleation sites. The annealing made it easier to induce recrystallization and improve the recrystallization nucleation rate. The twin boundary produced by the alloy after ultralow-temperature rolling and the uniform fine grains formed by annealing resulted in excellent strength and plasticity of the alloy. The twins formed after rolling under ultralow temperatures were mainly {101-2} <1-011> tensile twins. The alloy had comprehensive mechanical properties with a tensile strength of 186.15 MPa and an elongation of 29% after annealing at 350 °C for 10 min.
Highlights
IntroductionMagnesium alloys offer the advantages of low density, high specific strength, high specific rigidity, excellent electromagnetic shielding effectiveness, and recyclability
Magnesium and magnesium alloys have a hexagonal close-packed (HCP) crystal structure; under low-temperature deformation, it is difficult to activate slip, facilitating the formation of a strong texture and resulting in poor room-temperature formability, which limits the wide application of magnesium alloys in engineering materials [2,3,4,5]
Introduced a large number of high-energy defects, such as grain boundaries and dis-dislointroduced a large number of high-energy defects, such as grain boundaries and locations, which served as preferential nucleation sites during subsequent annealing cations, which served as preferential nucleation sites during subsequent annealing for for recrystallized grain formation
Summary
Magnesium alloys offer the advantages of low density, high specific strength, high specific rigidity, excellent electromagnetic shielding effectiveness, and recyclability. These materials have broad prospects for industrial applications, such as in aerospace and electronics, and are known as the “green structural engineering materials of the 21st century” [1]. Magnesium and magnesium alloys have a hexagonal close-packed (HCP) crystal structure; under low-temperature deformation, it is difficult to activate slip, facilitating the formation of a strong texture and resulting in poor room-temperature formability, which limits the wide application of magnesium alloys in engineering materials [2,3,4,5]
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