【摘要】 采用扫描电子显微镜、透射电子显微镜、X射线衍射仪、万能试验机及电阻率测试仪等研究了深冷处理(DCT)对冷轧Cu-1.34Ni-1.02Co-0.61Si合金组织和性能的影响。深冷处理使30%压下率冷轧合金显微组织细化和均匀化，并且随着深冷处理时间增加，细化和均匀化程度不断提高。深冷处理促使固溶Ni、Co和Si等原子不断从铜基体中析出，在合金晶粒内和晶界处形成尺寸为0.1～1μm之间的细小弥散球形和长条形第二相颗粒。冷轧前后合金的抗拉强度、电导率和延伸率均随着深冷处理时间延长而增加，并在约36 h后趋于稳定。深冷处理48 h后，冷轧前后合金的抗拉强度、电导率和延伸率分别增加了5.4%和4.4%、6.7%和8.0%、及13.2%和18.7%。冷轧后合金的抗拉强度高于冷轧前；而冷轧后的电导率和延伸率低于冷轧前，但差距均随着深冷处理时间增加而缩小。经深冷处理合金的拉伸断口韧窝的数量和深度比未经深冷处理合金大，且分布更加均匀。更多还原

【Abstract】 The influence of deep cryogenic treatments(DCT) on the microstructure and properties of a cold rolled Cu-1.34Ni-1.02Co-0.61Si alloy was investigated using scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffractometer(XRD), mechanical testing machine and low resistance tester. The DCT can refine and homogenize the microstructure of the alloy after cold rolling reduction of 30%. The grain refinement of the alloy becomes more obvious and the microstructure distribution becomes more uniform with increasing DCT time. The DCT promotes the precipitation of the solid solution elements Ni, Co and Si from the Cu matrix to form many fine and evenly distributed 0.1～1 μm spherical and strip second phase particles in the grain and grain boundary. The tensile strength, conductivity and elongation of the alloy before and after cold rolling reduction of 30% increase with increasing DCT time, and tend to be stable at about 36 h. After DCT for 48 h, the tensile strength, conductivity and elongation of the alloy before and after cold rolling increase by 5.4% and 4.4%, 6.7% and 8.0%, 13.2% and 18.7%, respectively. The tensile strength of the alloy after cold rolling is higher than that before cold rolling. The conductivity and elongation of the alloy after cold rolling are lower than those before cold rolling. However, the both differences decrease with increasing DCT time. The dimple quantity and depth of the alloy with DCT are larger, and the dimple distribution is more uniform than that without DCT.更多还原