7A99鋁合金鍛件雙級時效組織性能

7A99鋁合金鍛件雙級時效組織性能Microstructure and Properties of 7A99 Aluminum Alloy Forging after Two-step Aging Treatment

采用金相、掃描電鏡、透射電鏡分析及拉伸性能和斷裂韌度試驗等手段，研究了7A99鋁合金鍛件雙級時效處理后的組織和性能。結(jié)果表明：7A99鋁合金鍛件經(jīng)過120℃/4h+165℃/8 h雙級時效處理后的抗拉強度、屈服強度、伸長率和電導(dǎo)率分別為548 MPa，513 MPa，12.0%和38.2% IACS；鍛件的L-T向斷裂韌度為30.5 MPa·m1/2，鍛件顯示了較好的強韌匹配和耐蝕性；合金的斷裂方式為穿晶韌窩斷裂方式；主要沉淀相為η'相和η相。

Effects of two-step aging treatment on the microstructure and mechanical properties of 7A99 forged aluminum alloy were studied using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile test and fracture toughness test. The results show that after 120℃/4 h+165℃/8 h two-step aging treatment, the ultimate tensile strength, yield strength, elongation and electrical conductivity are 548 MPa, 513 MPa, 12.0% and 38.2% IACS, respectively. Meanwhile, the L-T toughness fracture is 30.5 MPa·m1/2.The fracture mode of the alloy is transgranular dimple fracture mechanism, and the major precipitates are η' and η phases under the aging condition.

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