利用差示量热法(DSC)、透射电镜(TEM)、选区电子衍射(SAED)、常规力学性能测试等手段研究了7B04铝合金时效沉淀析出及强化行为.结果表明:该材料存在显著的自然时效现象,大量的GP I区沉淀析出是自然时效强化的主要原因;合金在120℃进行人工时效的初期析出大量GP区,使材料的强度迅速提高,时效8 h后,其横向极限抗拉强度即可达到570 MPa,时效22 h时可达强度峰值点,此时GP区(包括GP Ⅰ和GPⅡ区)和η'相是主要强化相;峰值时效后继续延长时效时间,材料的强度无明显降低,极限抗拉强度保持在590 MPa左右.
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