利用真空感应炉在氩气保护下,设计与制备Mg-8Li-3Al-0.5Mn-xSr(x=0~1.0)合金,并将其进行热挤压处理。分别研究合金铸态与挤压态显微组织和拉伸性能。结果表明:LAM830合金主要含有α-Mg,β-Li,Al2Mn3和LiMgAl2相。在加入Sr后合金中出现Al-Sr析出相。Sr对铸态合金α-Mg基体的二次枝晶臂有明显细化效果。经过热挤压处理的合金组织远优于铸态的合金组织。金属间化合物的含量与形态对合金力学性能的影响很大,其中挤压态的LAM830-0.5Sr具有最佳的伸长率(22.43%),LAM830-0.75Sr合金具有最佳的抗拉强度(265.46 MPa)。 The Mg-8Li-3Al-0.5Mn-xSr (x = 0 ~ 1.0) alloy was designed and prepared by vacuum induction furnace under the protection of argon gas and was hot-extruded. The microstructures and tensile properties of as-cast and extruded alloys were studied respectively. The results show that: LAM830 alloy mainly contains α-Mg, β-Li, Al2Mn3 and LiMgAl2 phase. Al-Sr precipitates appear in the alloy after adding Sr. Sr on the as-cast alloy α-Mg matrix secondary dendritic arm significantly refinement effect. The hot-extruded alloy structure is far superior to the as-cast alloy structure. The content and morphology of the intermetallic compounds have a great influence on the mechanical properties of the alloys. The LAM830-0.5Sr in the as-extruded state has the best elongation (22.43%) and the LAM830-0.75Sr alloy has the best tensile strength 265.46 MPa).