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采用显微硬度与电导率测试、拉伸试验、晶间腐蚀及剥落腐蚀试验、金相(OM)及扫描电镜(SEM)观察,研究了热处理制度对含Sr Al-7.0Zn-1.4Mg-1.5Cu-0.14Zr 7085铝合金挤压材性能的影响。结果表明:固溶处理对合金的拉伸性能影响显著,强化固溶合金强度要明显高于常规固溶合金,常规固溶(470℃×2 h)T76(121℃×5 h+153℃×16 h)时效处理合金的屈服强度与抗拉强度分别为436.8 MPa、492.25 MPa,而经强化固溶(470℃×2 h+480℃×2 h+490℃×2 h)T76处理的合金为471.8MPa、518.25 MPa;时效制度对合金的硬度、电导率及抗腐蚀性能有较大影响,T76(121℃×5 h+153℃×16 h)时效处理后,合金获得较好的性能配合。本合金的最佳热处理制度为强化固溶T76时效处理,此时合金具有良好的综合性能。
The effects of heat treatment on the microstructure of the alloy with Sr Al-7.0Zn-1.4Mg-1.5 were investigated by means of microhardness and electrical conductivity test, tensile test, intergranular corrosion and exfoliation corrosion test, metallographic (OM) and scanning electron microscope Effect of Cu-0.14Zr 7085 aluminum alloy extrusion material properties. The results show that the solution treatment has a significant effect on the tensile properties of the alloy. The strength of the solution strengthened alloy is obviously higher than that of the conventional solid solution alloy (470 ℃ × 2 h), T76 (121 ℃ × 5 h + 153 ℃ 16 h), the yield strength and tensile strength of the aging treatment alloy were 436.8 MPa and 492.25 MPa, respectively. However, the alloys treated with T76 at 470 ℃ × 2 h + 480 ℃ × 2 h + 490 ℃ × 2 h were 471.8MPa and 518.25 MPa, respectively. The aging system has a great effect on the hardness, electrical conductivity and corrosion resistance of the alloy. After the aging treatment at 121 ℃ × 5 h + 153 ℃ × 16 h, the alloy obtained better performance. The alloy’s best heat treatment system is to strengthen the solution T76 aging treatment, this alloy has a good overall performance.