The bending springback angles of nanocrystalline Ni foil under different pulse current densities

The curve of the springback angles changing with the peak pulse current densities under the condition of different bending angles. It can be seen from the curve that the springback angle of samples decreases with the increase of the pulse current density when the bending angle is the same. When the current density is increased from 0 to 80A/mm2, the springback angles of the test samples with different bending angles of the mold decrease by 7°to 9°. The experimental results show that the pulse current can effectively improve the plastic deformation ability and reduce the springback angle when the nanocrystalline Ni foil is bent.不同弯曲角度条件下，回弹角随峰值脉冲电流密度变化的曲线。由该曲线可知，当弯曲角度一致时，试样的回弹角随脉冲电流密度的升高而降低。当电流密度从0提升至80A/mm²时，不同模具弯曲角度的试验试样的回弹角降幅介于7°至9°之间。实验结果表明，在对纳米晶镍箔（nanocrystalline Ni foil）进行弯曲加工时，脉冲电流可有效提升其塑性变形能力，降低回弹角。