研究了AA6156铝合金在不同时效状态下的拉伸性能和平面应力断裂韧性.结果表明:AA6156合金薄板在自然时效态下断裂韧性最好,但强度偏低;在190℃单级峰时效和175℃/6 h+190℃/13 h双级过时效态下强度较好,但断裂韧性偏低;而在175℃/2 h+200℃/0.5 h双级时效态下达到较理想的强韧性匹配.由透射电镜和扫描电镜观察其微观组织及断口形貌得出:双级时效时,第一级预时效处理能增大GP区的析出数量,从而在后续第二级时效时极大地促进β”相更密集、更均匀地析出.时效制度对AA6156合金断裂韧性的影响主要取决于晶内析出相β”,而受晶界微观组织结构的影响较小.
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