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研究了挤压工艺参数(挤压温度、挤压比)对Mg-Sr-Y中间合金组织和性能的影响。结果表明:Mg-Sr-Y中间合金的铸态组织是由树枝晶状的基体相α-Mg、沿晶分布的网状共晶组织(Mg17Sr2+Mg25Y4)组成;热挤压后合金的晶粒明显细化,树枝晶和网状组织被打碎,晶粒大小和合金中析出相的分布更均匀。同时挤压后合金的硬度显著提高,力学性能明显改善,形变强化效果较为显著,其强化效果与挤压温度和挤压比有关。挤压温度越高,挤压比越大,则强化效果越显著。
The effects of extrusion process parameters (extrusion temperature, extrusion ratio) on microstructure and properties of Mg-Sr-Y master alloy were studied. The results show that the as-cast microstructure of Mg-Sr-Y master alloy is composed of dendritic matrix phase α-Mg and intergranular eutectic eutectic structure (Mg17Sr2 + Mg25Y4). After hot extrusion, Obvious refinement, dendrites and reticular tissue is broken, the grain size and alloy precipitation phase distribution more evenly. At the same time, the hardness of the alloy increased significantly, the mechanical properties improved obviously, and the effect of deformation strengthening was remarkable. The strengthening effect was related to extrusion temperature and extrusion ratio. The higher the extrusion temperature, the greater the extrusion ratio, the more significant enhancement.