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为了进一步提高新型铝锂合金的强度及断裂韧性,探索了预变形+人工时效对该合金组织和性能的影响。采用拉伸试验、撕裂试验测试材料性能并主要通过透射电镜探索其相析出行为。结果表明,塑性变形导致大量T1相均匀弥散的析出在基体内,使材料获得了更为优异的强度和韧性;同时,预变形有效避免了PFZ的形成与宽化。合金在经过4.5%预变形+145℃,35 h时效可获得最优的材料性能,实现了更好的强度与韧性匹配。
In order to further improve the strength and fracture toughness of the new aluminum-lithium alloy, the effect of pre-deformation + artificial aging on the microstructure and properties of the alloy was explored. Tensile test, tear test to test the material properties and mainly through the transmission electron microscope to explore the phase precipitation behavior. The results show that plastic deformation causes a large amount of T1 phase to disperse uniformly in the matrix, resulting in more excellent strength and toughness of the material. Meanwhile, the pre-deformation effectively avoids the formation and broadening of the PFZ. After 4.5% pre-deformation alloy +455 ℃, 35 h aging can get the best material properties, to achieve better strength and toughness match.