Abstract—The dynamic properties of commercial copper (99.8 wt % purity) with a submicrocrystalline and nanocrystalline structure obtained by high-strain-rate deformation using the dynamic channel-angular pressing (DCAP) method have been studied in this work. The tests were carried out under conditions of shock compression at a pressure of 5.6−6.8 GPa at a strain-rate of (0.9−2.0) × 10⁵ s^–1. The analysis of the evolution of the structure and mechanical properties, namely, the dynamic elastic limit, dynamic yield stress, and the spall strength of copper before and after DCAP in different regimes, made it possible to evaluate the influence of the dispersity and imperfection of the crystal structure on its resistance to the high-strain-rate deformation and fracture. It has been shown that the grain refinement from 100 to 0.5−1.0 μm increased the dynamic elastic limit and the dynamic yield stress of copper by six times, but only slightly decreased the spall strength. The further refinement of the structure (up to 0.05−0.40 μm) increases the spall strength of copper by 1.4 times as compared to its value in the initial coarse-grained state.

摘要—研究了​​使用动态通道角挤压（DCAP）方法通过高应变率变形获得的具有亚微晶和纳米晶结构的商品铜（纯度为99.8 wt％）的动态特性。测试是在冲击压缩条件下，以5.6-6.8 GPa的压力，（0.9-2.0）×10 ⁵ s ^–1的应变率进行的。。通过分析DCAP前后在不同状态下铜的动态力学极限，动态屈服应力和铜的剥落强度的结构和力学性能的演变，可以评估铜的分散性和缺陷的影响。晶体结构对它的高应变率变形和断裂具有抵抗力。结果表明，晶粒细化从100微米增加到0.5-1.0微米，使铜的动态弹性极限和动态屈服应力提高了六倍，但剥落强度仅稍有降低。与初始粗晶粒状态下的值相比，结构的进一步细化（最大0.05-0.40μm）使铜的剥落强度提高了1.4倍。