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本文主要研究了2091合金薄板在预变形8%和12%,150℃和170℃不同时效时间下的组织和性能.随时效时间延长,时效温度升高,预应变增加,强度增加而塑性下降;时效初期合金主要断裂形式为穿晶断裂,随时效时间延长,沿晶断裂比例增大,这也是塑性下降的主要原因;时效时间延长,温度升高和预应变增加,δ’相析出增多长大,时效后期的s’相也析出增多,成为合金强化的主要原因;时效后期的S’相、共面滑移带和无析出区(PFZ)共同作用使塑性曲线下降平缓.
In this paper, the microstructures and properties of 2091 alloy sheet under pre-deformation of 8% and 12%, 150 ℃ and 170 ℃ for different aging time were studied. With aging time increasing, aging temperature increasing, pre-strain increasing and strength decreasing and plasticity decreasing. The main rupture of the early age alloy is transgranular fracture. With the aging time prolonging, the proportion of intergranular fracture increases, which is also the main reason for the plasticity decrease. The aging time prolongs, the temperature increases and the pre-strain increases, the δ ’phase precipitates increases and increases , And the s ’phase also precipitates at the late aging stage, which becomes the main reason for the strengthening of the alloy. The S’ phase, the coplanar slip zone and the non-precipitation zone (PFZ) in the late aging stage make the plastic curve decline gently.