工业纯铁爆炸冲击波增塑效应研究

Investigation on shock wave plasticization effect of pure iron

用透射电镜对冲击波加载的工业纯铁塑性机制进行了研究。结果表明其变形机制不同于准静态加载 ,塑性变形过程中冲击波绝热温升和亚结构的不稳定性使位错不断进行重新排列 ,应变较大时塑性变形功也会引起绝热温升 ,致使其亚结构已接近热加工动态回复组织 ,这种复杂的效应使塑性变形能力增强 ,结果使工业纯铁宏观塑性变形较大。

Using a transmission electron microscopy, the plastic deformation of pure iron subjected to shock waves has been observed . The results show that the mechanism of the plastic deformation is different from that under quasi-static loading. The dislocations continued to reorganize during the plastic deformation due to the instability of the substructures and the temperature rise associated with shock wave. As the strain increased , the plastic deformation work gave rise to a adiabatic temperature rise so that the substructure evolution in pure iron was similar to the dynamic recovery under warm-hot deformation conditions . The combination of the above effects enhanced the ability of plastic deformation of pure iron , so that the strain of pure iron subjected to shock wave is very high.