Abstract Electromagnetic powder compaction technology had the advantages of high efficiency and strong impact during the powder forming. The mechanical characteristics of copper powder compaction were investigated through digital image correlation technology under different discharge energies. The microstructure was analyzed by the metallography and electron microscopy. The results showed that the force-displacement curves had a bimodal tendency during the compaction of copper powders. The compaction force and velocity of copper powders gradually increased with the increase of discharge energy. The microstructure distribution of copper compacts was more and more dense as the discharge energy increased. However, the microstructure distribution of the axial direction of compact center was not much different overall at the same discharge energy. There was a tendency that the microhardness values at the center of the upper end faces were gradually larger than that of the lower end faces. The electromagnetic compaction equation of copper powders was established by Gaussian fitting. It had been verified that the error between the predicted and actual values of equation was only 0.47%.

中文翻译：

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基于电磁压制的铜粉压制力学特性、微观结构及方程研究

摘要 电磁粉末压制技术在粉末成型过程中具有效率高、冲击力强等优点。通过数字图像相关技术研究了不同放电能量下铜粉压实的力学特性。通过金相和电子显微镜分析显微组织。结果表明，在铜粉压实过程中，力-位移曲线具有双峰趋势。随着放电能量的增加，铜粉的压实力和压实速度逐渐增大。随着放电能量的增加，铜压块的微观结构分布越来越密。然而，在相同放电能量下，压实中心轴向的微观结构分布总体上差别不大。上端面中心显微硬度值有逐渐大于下端面显微硬度值的趋势。通过高斯拟合建立了铜粉的电磁压实方程。经验证，方程预测值与实际值的误差仅为0.47%。