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采用多层喷射沉积技术制备６０６６铝合金（Ａｌ１．３７Ｓｉ１．３７Ｍｎ０．７７Ｃｕ）锭坯，研究了后续半固态挤压工艺的可行性，及其对材料组织与性能的影响。结果表明，多层喷射沉积６０６６铝合金的平均晶粒度约为１５μｍ，呈等轴晶；在固相线以下退火４０ｍｉｎ后，组织无明显粗化，在半固态发生的晶粒长大符合Ｏｓｔｗａｌｄ晶粒粗化动力学方程，半固态典型组织为球形或近球形的固体颗粒分布于液相中，为适宜于半固态加工的搅溶组织。半固态挤压成形力约为传统热挤压的１／３，挤压件具有良好的第二相粒子分布状态，在Ｔ６热处理过程中组织发生再结晶，晶粒明显细化，二相粒子平均粒度由热挤压态的１μｍ增至２μｍ，体积分数有所增加，材料力学性能达到传统热挤压件水平。
6066 aluminum alloy (Al1.37Si1.37Mn0.77Cu) ingot was prepared by multi-layer spray deposition technology. The feasibility of the subsequent semi-solid extrusion process and its effect on the microstructure and properties were studied. The results show that the average grain size of multi-layer spray deposited 6066 aluminum alloy is about 15μm and equiaxed. After annealed for 40min below the solidus, the microstructure of the 6066 aluminum alloy is not coarsened obviously. The grain growth in the semi-solid state accords with Ostwald Grain coarsening kinetic equation, semi-solid typical structure of spherical or nearly spherical solid particles distributed in the liquid phase, is suitable for semi-solid processing of the stirred tissue. The semi-solid extrusion force is about 1/3 of the traditional hot extrusion, and the extrusion has good second-phase particle distribution. During T6 heat treatment, the microstructure recrystallizes and the grains are obviously refined. The average of two-phase particles The particle size increased from 1 μm in hot extrusion to 2 μm, the volume fraction increased, and the mechanical properties of the material reached the level of conventional hot extrusion.