The microstructure, hardness and corrosion properties of 7075 aluminum alloy fabricated by selective laser melting (SLM) under different heat treatment conditions were investigated The investigation results showed that the microstructure of the as-manufactured alloy fabricated by SLM has obvious inter-channel structure. When the solid solution plus single aging were used, the inter-channel structure of the alloys was beginning to fuse and disappear. The T phase could be dispersed in Al matrix, and a small amount of S phases and θ phases precipitated at the grain boundary. The hardness also increased compared with the as-manufactured alloy, and the average hardness is about HV123. When the solid solution plus double aging were used, the inter-channel structure of the alloy almost disappeared. The average of hardness is HV 158.The corrosion resistance (potential −0.805 V) of this alloy treated by solid solution plus double ageing also has an increase compared with the as-manufactured alloys (potential −0.87 V). S phases and θ phases precipitated at the grain boundary has a significant effect to improve the hardness and corrosion properties of Al alloys.

研究了在不同热处理条件下通过选择性激光熔炼（SLM）制备的7075铝合金的组织，硬度和腐蚀性能。研究结果表明，采用SLM制备的成品合金具有明显的通道间结构。当使用固溶体和单一时效处理时，合金的通道间结构开始融合并消失。所述Ť相位可以被分散在Al基体，和少量小号相位和θ相在晶界析出。与制成的合金相比，硬度也增加了，平均硬度约为HV123。当使用固溶体加双时效处理时，合金的通道间结构几乎消失了。平均硬度为HV158。与制造后的合金（电位-0.87 V）相比，经固溶加双时效处理的该合金的耐腐蚀性（电位-0.805 V）也有所增加。在晶界析出的S相和θ相对改善铝合金的硬度和腐蚀性能具有显著作用。