Abstract
High strain rate biaxial forging (HSRBF) was performed on AZ31 magnesium alloy to an accumulated strain of ΣΔε = 1.32, the related microstructure, texture and mechanical properties were investigated. It was found that the microstructure evolution can be divided into two steps during HSRBF. In the early forging processes, the refinement of the grain is obvious, the size of ~10 μm can be achieved; this can be attributed to the unique mechanisms including the formation of high density twins ({102} extension twin and {101}-{102} secondary twin) and subsequently twining induced DRX (dynamic recrystallization). The thermal activated temperature increases with the increase of accumulated strain and results in the grain growth. Rolling texture is the main texture in the high strain rate biaxial forged (HSRBFed) alloys, the intensity of which decreases with the accumulated strain. Moreover, the basal pole rotates towards the direction of forging direction (FD) after each forging pass, and a basal texture with basal pole inclining at 15–20° from the rolling direction (RD) is formed in the full recrystallized HSRBFed alloys. The grain refinement and tiled texture are attributed to the excellent strength and ductility of HSRMBFed alloys with full recrystallized structure. As the accumulated strain is ΣΔε = 0.88, the HSRMBFed alloy displays an outstanding combination of mechanical properties, the ultimate tensile strength (UTS) is 331.2 MPa and the elongation is 25.1%.
Highlights
Magnesium alloys are potential materials in airplanes and automobiles, they have good machinability, excellent damping capacity and favorable recycling capability, besides which, the advantage of light weight can save energy and reduce emissions [1,2]
[15], ZK21 [16] and alloys forging, throughand highthe strain rateprove triaixal and the results prove alloys through highmagnesium strain rate triaixal results thatforging, those alloys display excellent that those display excellentresulting balance of strength and ductility resulting from grain refinement
The microstructure evolution during High strain rate biaxial forging (HSRBF) can be divided into two steps, i.e., grain refinement in the early stage and grain growth with further increase of accumulated strain
Summary
Magnesium alloys are potential materials in airplanes and automobiles, they have good machinability, excellent damping capacity and favorable recycling capability, besides which, the advantage of light weight can save energy and reduce emissions [1,2]. High strain rate deformation was successfully carried out on Mg-Al-Zn [4,5], Mg-Zn-Zr [6,7], Mg-RE [8,9] alloys and pure magnesium [10]. These research studies reported that high strain rate facilitates high density twinning which subsequently induces dynamic recrystallization (DRX); the twinning and DRX can release stress and consume strain energy induced by plastic deformation, and results in remarkable improvement in the Materials 2020, 13, 3050; doi:10.3390/ma13143050 www.mdpi.com/journal/materials. Materials 2020, 13, 3050 subsequently induces dynamic recrystallization (DRX); the twinning and DRX can release stress and consume strain energy induced by plastic deformation, and results in remarkable improvement in the formability theinnovations, alloys.
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