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分别沿与冷轧Cu板轧向成0°(RD-0°),45°(RD-45°)和90°(RD-90°)方向取帽形试样,利用Split-Hopkinson压杆实验装置,研究了强迫剪切条件下冷轧Cu板的动态变形特征.结果表明:冷轧Cu板强迫剪切动态力学行为呈现出明显的各向异性,RD-90°方向屈服强度和峰值应力最大,RD-45°其次,RD-0°方向最小.不同方向的绝热剪切变形行为也表现出较大的差异,RD-0°方向的绝热剪切带内的变形相比其它2个方向均匀,绝热剪切敏感性最弱.基于剪切应力-剪切应变曲线和绝热剪切扩展所需能量,定性解释了不同方向绝热剪切敏感性的差异.EBSD的实验观察表明,3个方向上的剪切带内均有超细晶存在.基于亚晶旋转动态再结晶机制,理论计算结果证实了剪切带内发生再结晶的动力学可行性.
The hat-shaped specimens were taken from 0 ° (RD-0 °), 45 ° (RD-45 °) and 90 ° (RD-90 °) The dynamic deformation characteristics of cold-rolled Cu sheet under forced shear conditions were studied.The results show that the dynamic mechanical behavior of cold-rolled Cu sheet exhibits obvious anisotropy, and the yield strength and peak stress in RD-90 ° direction are the largest , RD-45 °, followed by the smallest RD-0 ° direction.The adiabatic shear deformation behavior in different directions also shows great difference, the deformation in the adiabatic shear band in RD-0 ° direction is more uniform than the other two directions , The weakest adiabatic shearing sensitivity.The qualitative analysis of the difference of adiabatic shear sensitivity in different directions was made based on the shear stress-shear strain curve and the energy required for adiabatic shear propagation.Experimental observations of EBSD showed that the shear stress- Of the shear band.According to the dynamic recrystallization mechanism of subgrain rotation, the theoretical calculation results confirm the kinetic feasibility of recrystallization in the shear band.