【摘要】：采用光學(xué)顯微鏡、掃描電鏡、透射電鏡、拉伸試驗(yàn)、剝落腐蝕試驗(yàn)等分析方法,研究了不同固溶、時(shí)效處理制度對(duì)含鈧7085鋁合金(Al-7.5Zn-1.5Mg-1.4Cu-0.15Zr-0.15Sc)強(qiáng)度和剝落腐蝕性能的影響。結(jié)果表明:與常規(guī)固溶處理和雙級(jí)固溶處理相比,強(qiáng)化固溶可使合金中粗大相溶解更充分,晶粒細(xì)化,同時(shí)提高合金強(qiáng)度和剝落腐蝕性能;在T6、T76、回歸再時(shí)效3種時(shí)效狀態(tài)下,T76時(shí)效后合金的強(qiáng)度和剝落腐蝕抗性最好,這與形成的粗大不連續(xù)的晶界析出相有關(guān)。含鈧7085鋁合金最佳固溶時(shí)效制度為:強(qiáng)化固溶(450℃×1 h+460℃×2 h+475℃×2 h)+T76時(shí)效(120℃×5 h+160℃×7 h)處理。
[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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