含钪7085铝合金的热处理工艺

发布时间：2018-12-13 11:45

【摘要】：采用光学显微镜、扫描电镜、透射电镜、拉伸试验、剥落腐蚀试验等分析方法,研究了不同固溶、时效处理制度对含钪7085铝合金(Al-7.5Zn-1.5Mg-1.4Cu-0.15Zr-0.15Sc)强度和剥落腐蚀性能的影响。结果表明:与常规固溶处理和双级固溶处理相比,强化固溶可使合金中粗大相溶解更充分,晶粒细化,同时提高合金强度和剥落腐蚀性能;在T6、T76、回归再时效3种时效状态下,T76时效后合金的强度和剥落腐蚀抗性最好,这与形成的粗大不连续的晶界析出相有关。含钪7085铝合金最佳固溶时效制度为:强化固溶(450℃×1 h+460℃×2 h+475℃×2 h)+T76时效(120℃×5 h+160℃×7 h)处理。
[Abstract]:Different solid solutions were studied by optical microscope, scanning electron microscope, transmission electron microscope, tensile test, exfoliation corrosion test, etc. Effect of aging treatment on strength and peeling corrosion of 7085 aluminum alloy containing scandium. The results show that, compared with conventional solution treatment and two-stage solution treatment, strengthening solid solution can make the coarse phase dissolve more fully, the grain size is refined, and the strength and exfoliation corrosion property of the alloy are improved at the same time. The strength and exfoliation corrosion resistance of the alloy after T76 aging is the best under the three aging states of T6 and T76, which is related to the coarse discontinuous precipitated phase at grain boundary. The optimum solution aging system of 7085 aluminum alloy containing scandium is as follows: strengthening solution treatment (450 鈩，

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