对长期时效后的GH4169合金进行不同应变速率条件下的动态拉伸变形,研究了应变速率对合金拉伸性能的影响规律。结果表明,随应变速率增加合金强度升高,而合金拉伸塑性呈下降趋势。在高应变速率范围内,晶内开动的滑移系数量增加,塑性变形能力随之提高,但晶界处的连续分布的δ相对晶界的弱化作用逐渐显露,晶界成为断裂的主要途径,导致合金塑性降低。 The dynamic tensile deformation of GH4169 alloy under different strain rates was studied. The effect of strain rate on the tensile properties of the alloy was studied. The results show that with the increase of strain rate, the strength of the alloy increases while the tensile ductility of the alloy decreases. In the high strain rate range, the amount of gliding coefficient increases and the plastic deformation ability increases. However, the weakening effect of the continuous δ distribution on the grain boundary gradually appears, and the grain boundary becomes the main way of fracture. Lead to plasticity reduction of the alloy.