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采用金相显微镜、冲击试验机、扫描电镜(SEM)及电化学腐蚀仪等试验设备研究了不同时效工艺处理下轧制态7075铝合金的显微组织、断口形貌以及耐腐蚀性。结果表明:在不同时效工艺条件下,7075铝合金的组织形貌、断口形貌及耐腐蚀性差异较大。当单级160℃低温时效时,晶粒组织大小均匀性较差,断裂面中的断裂韧窝较少、较浅且耐腐蚀性较低;当双级200℃中温时效时,晶粒组织大小均匀性较好,同时断裂面中的韧窝较多、较深且耐蚀性较高;当三级240℃高温时效时,晶粒发生粗化,同时断裂韧性变差且耐腐蚀性降低。
The microstructure, fracture morphology and corrosion resistance of 7075 aluminum alloy under different aging treatments were studied by means of metallographic microscope, impact tester, scanning electron microscope (SEM) and electrochemical corrosion tester. The results show that under different aging conditions, the microstructure, fracture morphology and corrosion resistance of 7075 aluminum alloy are quite different. When single-stage aging at low temperature of 160 ℃, grain size uniformity is poor, the fracture surface of the fracture dimples less, lighter and less corrosion resistance; when the two-stage 200 ℃ temperature aging, the grain size The homogeneity is better, and the number of dimples in the fracture surface is more, the depth is higher and the corrosion resistance is higher. When the three-stage high temperature aging is carried out at 240 ℃, the grains coarsen, the fracture toughness deteriorates and the corrosion resistance decreases.