Effect of heat treatment on microstructure, hardness and corrosion resistance of 7075 Al alloys fabricated by SLM
Effect of heat treatment on microstructure, hardness and corrosion resistance of 7075 Al alloys fabricated by SLM
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DOI：
10.1016/j.jmapro.2020.10.071
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发表时间：
2020-12
影响因子：
6.2
通讯作者：
Peng Liu;Jiaying Hu;Huai-xue Li;Siyu Sun;Yuan-bin Zhang
中科院分区：
文献类型：
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作者：
Peng Liu;Jiaying Hu;Huai-xue Li;Siyu Sun;Yuan-bin Zhang
研究了不同热处理条件下选区激光熔化(SLM)制备的7075铝合金的显微组织、硬度和腐蚀性能。研究结果表明，SLM制备的合金显微组织具有明显的通道间结构。当采用固溶加单一时效时，合金的通道间结构开始熔化并消失。 T相弥散分布在Al基体中，晶界处析出少量S相和θ相。与制造态合金相比硬度也有所增加，平均硬度约为HV123。当采用固溶加二次时效时，合金的通道间结构几乎消失。平均硬度为HV 158。固溶加二次时效处理后的合金的耐腐蚀性能（电位-0.805 V）与成品合金（电位-0.87 V）相比也有提高。晶界析出的S相和θ相对提高铝合金的硬度和腐蚀性能有显着效果。
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. TheTphase could be dispersed in Al matrix, and a small amount ofSphases andθphases 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).Sphases andθphases precipitated at the grain boundary has a significant effect to improve the hardness and corrosion properties of Al alloys.