采用电子背散射衍射(EBSD)技术对冷轧后铜镍合金管材的组织进行分析.通过对第二道次冷轧不同变形量(3.19％、9.57％、19.37％、23.97％、31.78％)的C71500铜镍合金在管材轧制后的显微硬度、抗拉伸性能、微观组织、织构及其含量变化的研究,揭示该合金织构的变化规律.通过对铜镍合金管材晶界、织构的变化及晶粒尺寸进行分析,揭示了变形量与变形储存能的量化关系,这种关系可以通过小角度晶界的比例更直观地体现出来.随着加工率的增加,铜镍合金的屈服强度、抗拉伸强度和维氏显微硬度均呈现上升的趋势,而合金的塑性则呈现下降的趋势.研究结果为合理选择变形量以及形成特殊晶界的热力学提供依据,同时为后续铜镍合金管材的变形加工提供理论依据.“,”Electron backscatter diffraction (EBSD) technique was used to analyze the microstructure of cold-rolled C71500 cupronickel alloy tube.Through the analysis of microhardness,tensile properties,microstructure,texture,and texture content of the cupronickel alloy tube after the second pass cold rolling with different deformations (3.19％,9.57％,19.37％,23.97％,31.78％),the texture change law of the alloy was obtained.The quantitative relationship between deformation and storage energy was revealed by analyzing the grain size and the change of texture and grain boundary,which could be directly reflected by the proportion of small angle grain boundaries.The optimal deformation of second pass rolling for C71500 alloy was obtained.Results show that the yield strength,tensile strength,and microhardness of cupronickel alloy are increased with increasing the working ratio,while the plasticity is decreased.