Abstract
In this study, a fully recrystallized ultrafine grained (UFG) Mg-Zn-Zr-Ca alloy was successfully fabricated by a process including high pressure torsion (HPT) and subsequent rapid annealing. Room temperature tensile test revealed that the UFG Mg alloy with a mean grain size of 0.98 μm exhibited simultaneously enhanced strength and ductility compared to those of the coarse grained counterpart (grain size 57 μm). Observation of deformation microstructures revealed that {10-12} deformation twinning and basal slip were the dominant deformation mechanisms in the coarse grained specimen, while deformation twinning was significantly inhibited but non-basal slip systems seemed activated in the UFG specimen. The reason for the enhanced mechanical properties in the UFG specimen was discussed based on the change of deformation mechanisms observed.
Highlights
In recent years, Magnesium (Mg) alloys have attracted extensive attention due to their low density and high specific strength
The areas at a distance of 3.0 mm from the center on sections perpendicular to the rotation axis of the annealed discs were characterized by field emission scanning electron microscopy (FE-SEM) using JSM 7100F equipped with an electron backscattering diffraction (EBSD) system
A fully recrystallized ultrafine grained (UFG) ZKX600 Mg alloy having a mean grain size of 0.98 μm was successfully fabricated by the combination of high pressure torsion (HPT) and subsequent annealing
Summary
Magnesium (Mg) alloys have attracted extensive attention due to their low density and high specific strength They are expected to be applied in transportation and aerospace industries as structural components, achieving significant weight reduction [1,2,3]. Due to the high density of retained lattice defects (such as dislocations), the HPT-processed NC/UFG Mg alloys did not show good ductility. Their mechanical properties were characterized only by using simple hardness test. Microstructure observation and mechanical property test reveal that fully recrystallized UFG ZKX600 Mg alloy with simultaneously enhanced strength and ductility is successfully obtained. The change of deformation mechanisms are discussed based on the deformation microstructures observed
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