【摘要】 选用选区激光熔化和热挤压制备出纳米结构铝合金/TC4钛合金的三维互穿复合材料，研究了不同挤压比对复合材料微观组织和力学性能的影响。结果表明，复合材料中的TC4合金的柱状多孔结构特征在热挤压过程中并未被破坏，组织为片条状α相和β相，铝合金区域为纳米富Al金属间化合物和纳米晶Al;随着挤压比增大，α相和β相铝合金中的纳米相变得更加细小，复合材料的抗拉强度不断提高，伸长率从5%下降至4%。更多还原

【Abstract】 Nano structured Al alloy/TC4 interpenetrating-phase composites were fabricated through the combination of selective laser melting and heat extrusion. The effects of extrusion ratio on the microstructure and mechanical properties of the composites were investigated. The results indicate that the cylindrical TC4 porous structure sare hardly destroyed during the process of hot extrusion, which presents a mixture of strip like α and β phases, while nano structured Al alloy area consists of nano crystalline FCC-Al and nano-sized Al-rich intermetallic compound. With extrusion ratio increase, α, β phases and nano-size phases in the nano structured Al alloy areas are refined, where the tensile strength is increased continuously, however the elongation is decreased from 5% to 4%.更多还原