【摘要】 本文研究了7050铝合金在等通道转角挤压（ECAP）和层间时效组合过程中变形与析出物之间的相互作用及其对合金力学性能的影响。结果表明，在层间时效过程中，由于变形诱导了大量的亚结构和位错，有效地促进了尺寸分布为双峰结构的η’相析出。在层间时效和随后的ECAP过程中，由于析出相的钉扎效应，晶粒细化度（4.8μm）降低的同时位错密度(1.24×10¹⁵ m^-2)大幅提高，位错运动导致第二相颗粒变得更加细小和弥散。合金的极限抗拉强度和屈服强度分别达到约610 MPa和565 MPa，高强度源于沉淀强化、细晶粒强化和位错强化的协同效应；而双峰尺寸结构的晶粒以及均匀而细小分散的第二相颗粒则保证了合金的延展性。更多还原

【Abstract】 In this study, the interaction between deformation and precipitates during multiple equal channel angular pressing（ECAP） deformations and inter-pass aging combination and its effect on the mechanical properties of 7050 aluminum alloy are studied. The result show that ECAP induces numerous substructures and dislocations, effectively promoting the precipitation of the η’ phase exhibiting a bimodal structure during inter-pass aging. Following inter-pass aging and subsequent ECAP, the decrease in grain size（4.8 μm） is together with the increase in dislocation density(1.24×10¹⁵ m^-2) due to the pinning effect of the precipitated phase. Simultaneously, the dislocation motion causes the second phase particles to become even finer and more diffuse. The synergistic effects of precipitation strengthening, fine grain strengthening, and dislocation strengthening collectively enhance the high strength of aluminum alloys, with ultimate tensile strength and yield strength reaching approximately 610 and 565 MPa, respectively. Meanwhile, ductility remains largely unchanged, primarily due to coordinated grain boundary sliding and the uniform and fine dispersion of second phase particles.更多还原