单晶铜在实际应用时需经过多次塑性变形,将导致包申格效应的产生,对其后续工艺和产品质量产生影响.对单晶铜在先压缩后拉伸时出现的包申格效应进行了研究,并与多晶铜进行了对比.实验结果表明:单晶铜和多晶铜在正反向加载时均出现包申格效应,在预应变相同的条件下,单晶铜的包申格效应不如多晶铜的显著.单晶铜的包申格效应随预压缩量的增加先增大后减小,在预压缩量为0.156%附近该效应最为显著.多晶铜的包申格效应在预压缩量小于0.2%时变化不明显,大于0.2%时随预压缩量的增加而增加.单晶铜中出现包申格效应的根本原因是反向加载时短程应力的释放,多晶铜中由于存在晶界引起的长程应力,在反向加载时该应力和短程应力同时释放,从而体现出更为显著的包申格效应. Single crystal copper in the actual application to be subjected to multiple plastic deformation, will lead to Bauschinger effect, its follow-up process and product quality have an impact on the single crystal copper pre-compression after the tensile Bauschinger effect And compared with polycrystalline copper.The experimental results show that the Bauschinger effect appears when the single crystal copper and the polycrystalline copper are loaded in the forward and reverse directions, and under the same prestrain condition, the single crystal copper package The SIC effect is not as remarkable as that of polycrystalline copper.The Bauschinger effect of single crystal copper first increases and then decreases with the increase of pre-compression amount, and this effect is most significant near the pre-compression amount of 0.156%. The grid effect does not change obviously when the pre-compression amount is less than 0.2%, and increases with the pre-compression when the pre-compression amount is more than 0.2%. The fundamental reason for Bauschinger effect in single-crystal copper is the release of short- Due to the long-range stress caused by grain boundary in crystal copper, the stress and short-range stress are released at the same time in reverse loading, which shows the more significant Bauschinger effect.