In the present study, commercial Cu-35Zn α-brass sheets were subjected to cryogenic rolling (CR) to obtain samples with different amounts of deformation in the thickness direction. A self-designed liquid nitrogen cooling system that can simultaneously cool the work rollers and samples was used to ensure an ultra-low temperature condition during the rolling process. The grains, deformation twins, and dislocation density of the samples were studied by optical microscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD). Uniaxial tensile tests and Vickers hardness measurements were conducted to measure the mechanical properties of the samples. The microstructures and mechanical properties of CR samples were apparently improved compared to the room temperature rolling (RTR) samples with increasing deformation amount. As a typical example, when the deformation amount is 90%, the CR sample possesses ultrafine microstructures and demonstrates extraordinary mechanical properties. The average tensile and yield strengths of a 90% deformation CR sample can be improved to 835.3 MPa and 711.5 MPa, while those of a 90% deformation RTR sample are 718.6 MPa and 481.2 MPa. The average elongation of the CR sample is 2.9%, which is acceptable compared with the RTR sample whose average elongation is 3.1%. The ultrafine microstructures containing ultrafine grains, high density dislocation, and nanometer scale deformation twins in the 90% deformation CR sample may be the main reason for its extraordinary mechanical properties. Therefore, samples with a good combination of strength and ductility were obtained in the present study. This may be a valuable exploration to fabricate Cu-35Zn alloy sheets with excellent microstructures and mechanical properties.

在本研究中，对商品化的Cu-35Znα-黄铜薄板进行低温轧制（CR），以获得在厚度方向上具有不同变形量的样品。使用可同时冷却工作辊和样品的自行设计的液氮冷却系统，以确保轧制过程中的超低温条件。通过光学显微镜，透射电子显微镜（TEM）和X射线衍射（XRD）研究了样品的晶粒，变形孪晶和位错密度。进行单轴拉伸试验和维氏硬度测量以测量样品的机械性能。与室温轧制（RTR）样品相比，随着变形量的增加，CR样品的显微组织和力学性能得到明显改善。作为一个典型的例子，当变形量为90％时，CR样品具有超细的微观结构，并显示出非凡的机械性能。90％变形CR样品的平均抗张强度和屈服强度可以提高到835.3 MPa和711.5 MPa，而90％变形RTR样品的平均抗张强度和屈服强度分别为718.6 MPa和481.2 MPa。CR样品的平均伸长率为2.9％，与RTR样品的平均伸长率为3.1％相比是可以接受的。90％变形CR样品中包含超细晶粒，高密度位错和纳米级形变孪晶的超细微结构可能是其非凡机械性能的主要原因。因此，在本研究中获得了强度和延展性良好组合的样品。