The Al-27Si alloy was prepared using spray deposition and subsequently incorporated into Mg-Li alloy by vacuum melting furnace to produce a novel Mg-8Li-3Al-0.3Si (LA83–0.3Si) duplex alloy. The effect of final rolling deformation (30%, 40%, 50% and 60%) on the microstructure, mechanical properties, work hardening, and softening behavior was researched. Results indicated that the LA83–0.3Si alloy mainly comprised of α-Mg, β-Li, AlLi, and MgSi phases. The rolling deformation process induced elongation of the α-Mg and β-Li phase along rolling direction, facilitating the formation of α/β laminar structure, notably enhancing the strength and ductility. Increased final rolling deformation further prompted the formation of the α/β laminar structure and refined the precipitates. Consequently, the LA83–0.3Si alloy's strength progressively increased while elongation slightly diminished. At 60% deformation, the ultimate tensile strength of the LA83–0.3Si alloy reached 331 MPa, with the elongation sustained to 10.9%. The rolling process led to a reduction in the work hardening rate and an increase in the softening rate. With the increase of the final rolling deformation, the work hardening rate decreases and the softening rate further increases. However, the work hardening rate increases, and the softening rate decreases due to the decreasing of the hardness ratio of α-Mg and β-Li phases at 60% deformation.

中文翻译：

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最终轧制变形对Mg-8Li-3Al-0.3Si合金显微组织、加工硬化和软化行为的影响

采用喷射沉积法制备 Al-27Si 合金，随后通过真空熔炼炉将其掺入 Mg-Li 合金中，生成新型 Mg-8Li-3Al-0.3Si (LA83–0.3Si) 双相合金。研究了最终轧制变形（30%、40%、50%和60%）对显微组织、力学性能、加工硬化和软化行为的影响。结果表明，LA83-0.3Si合金主要由α-Mg、β-Li、AlLi和MgSi相组成。轧制变形过程引起α-Mg和β-Li相沿轧制方向伸长，有利于α/β层状结构的形成，显着提高强度和延展性。最终轧制变形的增加进一步促进了α/β层状结构的形成并细化了析出物。因此，LA83-0.3Si 合金的强度逐渐增加，而伸长率略有下降。在60%变形时，LA83-0.3Si合金的极限拉伸强度达到331 MPa，伸长率维持在10.9%。轧制过程导致加工硬化率降低和软化率增加。随着终轧变形量的增加，加工硬化率降低，软化率进一步增加。然而，在60%变形量时，由于α-Mg和β-Li相的硬度比降低，加工硬化率增加，软化率降低。