Double change channel angular extrusion (DCCAE) was performed in dual-phase Mg-9.5Li-3Al-1.6Y (wt.%) alloy to de-velop 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 recrystallizedβ-Li grains, bandedα-Mg phases, and Al2Y phasesdistributed inβ-Li phases and phase-interface uniformly. Compared with CE, the specimens after DCCAE had smallerβ-Li grain size (3–5μm by the DCCAE and 6–10μm by the CE) and theα-Mg phases were refined during the DCCAE. The distribution of the Al2Y phases was improved a lot by DCCAE. Furthermore, the specimens after DCCAE had better tensile strength than conven-tional extrusion ones.
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