(1. 福州大学 材料科学与工程学院，福州 350108；
2. 福州大学 机械工程及自动化学院，福州 350108；
3. 福建省产品质量检验研究院，福州 350002)
摘 要: 采用ABAQUS软件对Cu-38Zn合金不同尺寸的试样平行模压和交叉模压两种形变过程进行有限元模拟，观察模压形变后试样的显微组织，研究Cu-38Zn合金经模压形变后的微观组织与等效应变的关系。结果表明：经模压形变后Cu-38Zn合金的晶粒细化不但与模压形变时积累的等效应变有关，而且与模压形变时变形场的复杂性和试样的尺寸有关。Cu-38Zn合金的晶粒尺寸随着等效应变的增大而减小，但是在相同的等效应变下，复杂的变形场具有更有效的晶粒细化效果；较大尺寸的试样具有更多的孪晶组织。
关键字: Cu-38Zn合金；模压形变；有限元模拟；大塑性变形；晶粒细化
（1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
2. College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China;
3. Fujian Inspection and Research Institute for Product Quality, Fuzhou 350002, China）
Abstract:The parallel constrained groove pressing and the cross constrained groove pressing were imposed on a Cu-38Zn alloy sheet with different sizes numerically and experimentally. The relationship between the microstructure and equivalent strain of the Cu-38Zn alloy was investigated. It is found that the grain reduction of a Cu-38Zn alloy subjected to both constrained groove pressing is not only related to the accumulated equivalent strain but also related to the complexity of the deformation field and the specimen size. With the increase of the equivalent strain, the grain size of the Cu-38Zn alloy decreases. However, the cross-orientation pressing procedure results in finer grains than the single-orientation pressing procedure even though both pressings have the same equivalent strain. The larger the specimen size is, the more the twin in the specimen is.
Key words: Cu-38Zn alloy; constrained groove pressing; finite element modeling; severe plastic deformation; grain refinement
