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Double change channel angular extrusion(DCCAE) was performed in dual-phase Mg-9.5Li-3Al-1.6Y(wt.%) alloy to develop fine-grained microstructures. The microstructure evolution during DCCAE and conventional extrusion(CE) was investigated. The microstructure of the extruded dual-phase Mg-Li alloy consisted of recrystallized β-Li grains, banded α-Mg phases, and Al_2Y phases distributed in β-Li phases and phase-interface uniformly. Compared with CE, the specimens after DCCAE had smaller β-Li grain size(3–5 μm by the DCCAE and 6–10 μm by the CE) and the α-Mg phases were refined during the DCCAE. The distribution of the Al2 Y phases was improved a lot by DCCAE. Furthermore, the specimens after DCCAE had better tensile strength than conventional extrusion ones.
The microstructure evolution during DCCAE and conventional extrusion (CE) was investigated. The microstructure evolution during DCCAE and conventional extrusion (CE) was investigated in a two-phase Mg-9.5Li-3Al- The microstructure of the extruded dual-phase Mg-Li alloy consisted of recrystallized β-Li grains, banded α-Mg phases, and Al_2Y phases distributed in β-Li phases and phase-interface uniformly. Compared with CE, the specimens after DCCAE had smaller β-Li grain size (3-5 μm by the DCCAE and 6-10 μm by the CE) and the α-Mg phases were refined during the DCCAE. The distribution of the Al2 Y phases was improved a lot by DCCAE. , the specimens after DCCAE had better tensile strength than conventional extrusion ones.