采用拉伸试验、金相、扫描电镜、透射电镜高分辨组织分析方法，研究了水冷铜模铸造的扁锭轧制的Al-3.0Si-0.6Mg-0.4Cu-0.6Mn-0.18Fe合金薄板经400℃至540℃不同温度保温30 min水淬、室温停放90 d（自然时效）后的组织和性能.结果表明：在6009合金基础上提高Si的质量分数至3%，有提高其强度的作用；该合金薄板经540℃×30 min 固溶处理自然时效后屈服强度为180 MPa、抗拉强度为313 MPa、延伸率接近23%，其组织中存在Si结晶相及含Fe、Mn和少量Cu、Si的结晶相，以及尺寸小于0.5μm 的以含Mn为主并含少量Si和Fe的弥散相；提高其固溶处理温度至540℃，合金薄板的强度明显提高，其原因是析出强化产物尺寸增大，密度提高了.
After storage at room temperature for 90 days by water quenching following heat treatment at a temperature range from 400℃ to 540℃ for 30 minutes,the microstructure and properties of A. l-3. 0Si-0. 6Mg-0. 4Cu-0. 6Mn-0. 18Fe alloy sheet were investigated by tensile test,optical microscopy,scanning electron microscopy, transmission electron microscopy and high resolution transmission electron microscopy. The results showed when silicon content rises to 3% on the basis of 6009 alloy,the strength of the alloy will increase. After natural aging following solution treatment at 540℃ for 30 minutes the yield strength ,tensile strength and elongation of the alloy sheet reach 180 MPa,313 MPa and nearly 23% respectively. There are mainly three kinds of phases except for the alloy matrix in Al-0. 6Mg-3. 0Si-0. 4Cu-0. 6Mn-0. 18Fe alloy sheet after a treatment,that is,Si crystalline phase,Fe,Mn crystalline phase with a small amount of Cu and Si,and a dispersal phase mainly consisted of Mn with a size less than 0. 5 μm. Because when the solution treatment temperature is increased to 540 ℃,the size and density of the precipitation are increased,strength of the alloy sheet remarkably rises.
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