A supersaturated Al–Zn–Mg alloy was processed by dynamic plastic deformation (DPD) using a Split-Hopkinson pressure bar (SHPB) facility with strain range from 0.5 to 1.5 and then subjected to compressive testing at strain rates of 1 × 10⁻³–4 × 10³ s⁻¹. The results show that there is concurrent occurrence of grain refinement, increase in dislocation density and precipitation of fine precipitates in different morphologies during DPD at strain over 1. This enhances the yield strength of the Al alloy after DPD over the as-received material in peak-aging state (T6). Grains are refined through the formation of low angle grain boundaries (LAGBs) by rearrangement of dislocations which leads to the subdivision of original grains. Heterogeneous coarse precipitates mainly of T (Al₂₀Cu₂Mn₃) and E (Al₁₈Mg₃Cr₂) phases distribute along dislocations and grain boundaries after DPD. Dynamic precipitation of very fine η′ and η during DPD occurs where the volume fraction of precipitates increases with increasing the number of presses. The influence of precipitates on the strain rate sensitivity is also discussed.

使用Split-Hopkinson压力棒（SHPB）装置通过应变范围为0.5到1.5的动态塑性变形（DPD）处理过饱和的Al-Zn-Mg合金，然后以1×10 ^-3的应变率进行压缩测试–4×10 ³ s ^-1。结果表明，在超过1的应变下，DPD期间同时发生晶粒细化，位错密度增加和不同形态的细小析出物的析出。这提高了DPD处理后的铝合金在峰值处的屈服强度。 -老化状态（T6）。通过位错的重排形成低角度晶界（LAGB）来细化晶粒，从而导致原始晶粒的细分。非均质的粗大析出物主要是T（Al ₂₀ Cu ₂ Mn ₃）和E（Al ₁₈ Mg ₃ Cr ₂）DPD之后，相沿位错和晶界分布。在DPD期间会发生非常细小的η'和η的动态沉淀，其中沉淀的体积分数随压机数量的增加而增加。还讨论了沉淀物对应变率敏感性的影响。