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采用差热分析(DSC)、室温拉伸、电导率测试、显微组织观察研究了不同固溶温度和固溶时间对7050铝合金厚板组织和性能的影响。结果表明,试验用合金的过烧温度约为486.3℃;随固溶温度升高,合金电导率下降,强度先升高后下降,热处理温度高于过烧温度后,伸长率迅速下降。在480℃×90 min条件下固溶处理时,T6时效态合金的抗拉强度、屈服强度和伸长率分别达到600 MPa、525 MPa和15.0%。合金适宜的固溶处理制度为480℃×(90～120)min。
The effects of different solution temperature and solution time on microstructure and properties of 7050 aluminum alloy plate were investigated by differential scanning calorimetry (DSC), room temperature tensile test, electrical conductivity test and microstructure observation. The results show that the overfire temperature of the test alloy is about 486.3 ℃. With the increase of solution temperature, the conductivity of the alloy decreases, the strength first increases and then decreases, and the elongation decreases rapidly when the heat treatment temperature is higher than the over-burning temperature. Tensile strength, yield strength and elongation of T6 aged alloy reached 600 MPa, 525 MPa and 15.0% respectively at 480 ℃ for 90 min. The proper solution treatment system of alloy is 480 ℃ × (90 ~ 120) min.