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通过分析7075/6009铝合金层状复合板材内层显微组织与显微硬度分布,研究了固溶处理对板材内层显微组织与力学性能的影响。结果表明:在470～500℃范围内,随着固溶温度的升高,板材内层和过渡区的显微硬度值呈先升后降的趋势,在485℃时达到峰值,而外层显微硬度值呈上升趋势;内层显微组织在485℃时残留的颗粒相数量最少,而在500℃时发生“过烧”。在15～300 min内,板材内层和过渡区显微硬度值在30 min时达到峰值,而外层显微硬度值变化不明显;内层显微组织随着固溶时间的延长而变粗大,残留颗粒相数量在30 min后趋于平衡。通过T6热处理工艺:485℃固溶30 min+水淬+175℃时效8 h,7075/6009铝合金层状复合板材可获得较高的力学性能:抗拉强度为404 MPa,屈服强度为364 MPa,伸长率为15.3%;同比T6热处理的6009铝合金板材,其抗拉强度提高36%,屈服强度提高75%,但伸长率降低16%。
By analyzing the microstructure and the microhardness distribution of the inner layer of 7075/6009 aluminum alloy laminated composite sheet, the effect of solution treatment on the microstructure and mechanical properties of the inner sheet was studied. The results show that in the range of 470-500 ℃, with the increase of solution temperature, the microhardness values of the inner and the transition zone of the sheet first and then decrease, reaching the peak at 485 ℃, while the outer layer was significantly The microhardness value showed an upward trend. The innermost microstructure had the least amount of residual particles at 485 ℃, but “over-burned” at 500 ℃. Within 15 ~ 300 min, the microhardness value of the inner layer and the transitional area peaked at 30 min, while the microhardness of the outer layer did not change obviously. The inner microstructure became coarse with the extension of the solution time , The amount of residual particles tended to balance after 30 min. T6 heat treatment process: 485 ℃ solution 30 min + water quenching + 175 ℃ aging 8 h, 7075/6009 aluminum alloy laminated composite sheet can get higher mechanical properties: tensile strength of 404 MPa, yield strength of 364 MPa, Elongation of 15.3%; T6 heat treatment of 6009 aluminum alloy sheet, the tensile strength increased by 36%, yield strength increased by 75%, but the elongation decreased by 16%.