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研究均匀化退火对直接冷却法制备的7050/6009复层板坯界面区域的组织演化、成分分布和力学性能的影响。结果表明,最佳的均匀化退火工艺是460°C条件下保温24 h。均匀化退火后,在复层板坯界面处沉淀出了富锌相和Al_(15)(Fe Mn)_3Si_2相。均匀化时间固定为24 h的条件下,当均匀化温度由440°C增加到480°C时,复层试样的扩散层厚度增加了30μm;均匀化温度固定为460°C条件下,当均匀化时间由12 h增加到36 h时,复层试样的扩散层厚度增加了280μm。均匀化退火后,复层合金的6009合金侧和界面处的维式硬度均降低,晶粒粗化为主要的软化机制;然而7050合金侧的维式硬度变化较复杂,原因归结为固溶强化、弥散强化和增强相的溶解的混合作用。
The effects of homogenization annealing on the microstructure evolution, composition distribution and mechanical properties of 7050/6009 slab interface prepared by direct cooling method were studied. The results show that the best homogenization annealing process is incubated at 460 ° C for 24 h. After the homogenization annealing, the Zn-rich phase and the Al_ (15) (Fe Mn) _3Si_2 phase precipitated at the interface of the slab. When the homogenization time is fixed at 24 h, the thickness of the diffusion layer in the multi-layered sample increases by 30 μm when the homogenization temperature is increased from 440 ° C. to 480 ° C. When the homogenization temperature is fixed at 460 ° C., When the homogenization time increased from 12 h to 36 h, the thickness of the diffusion layer in the multi-layer sample increased by 280 μm. After homogenization annealing, the Vickers hardness at the side and interface of the alloy 6009 is decreased and the grain coarsening is the main softening mechanism. However, the variation of the Vickers hardness at the side of the 7050 alloy is complicated due to the solid solution strengthening , Dispersion strengthening and enhancing the dissolution of the mixed phase.