研究了7B04铝合金材料在不同热处理状态下的微观组织和性能.结果表明, 目前的单级固溶处理(470 ℃×80 min)并未使合金内一次析出相充分回溶,经物相分析确定残留相为MgZn2,S(Al2CuMg),T(Mg32(Al, Zn)49)及Al7Cu2Fe相等.T6状态下晶内析出相为细小GP区和η'相,晶界析出相为半连续状态,无明显的晶间无析出带(PFZ)存在,合金的抗拉强度达595 MPa,电导率为31.7%IACS;在T7(115 ℃×7 h+160 ℃×12 h)状态下,晶内的析出相为GP区、η'和η相,尺寸约为5～20 nm,晶界有不连续的较为粗大相析出,有明显的PFZ存在,此时抗拉强度为532 MPa,电导率为37.0%IACS;采用RRA处理可使合金获得较高强度和较高电导率,抗拉强度和电导率分别为575 MPa和36.3%IACS,此时晶内析出相为η'和η相,晶界析出物粗大呈完全不连续分布,有明显PFZ存在.
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