Influence of Deep Cryogenic Treatments on Microstructure and Properties of Cold Rolled Cu-Based Alloy [深冷处理对冷轧铜合金组织与性能的影响]

作者：Keming L.^*; Xiaochun S.; Xiaolong L.; Ying J.; Mulin L.; Zhi S.; Kai F.; Haitao Z.

来源：Rare Metal Materials and Engineering, 2023, 52(1): 215-221.

• cold rolling
• copper alloy
• deep cryogenic treatment
• microstructure
• properties

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 m 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.

• 单位
  中南大学; 南昌理工学院