(1. 福州大學(xué) 材料科學(xué)與工程學(xué)院，福州 350108；
2. 福州大學(xué) 機(jī)械工程及自動化學(xué)院，福州 350108；
3. 福建省產(chǎn)品質(zhì)量檢驗研究院，福州 350002)
摘 要: 采用ABAQUS軟件對Cu-38Zn合金不同尺寸的試樣平行模壓和交叉模壓兩種形變過程進(jìn)行有限元模擬，觀察模壓形變后試樣的顯微組織，研究Cu-38Zn合金經(jīng)模壓形變后的微觀組織與等效應(yīng)變的關(guān)系。結(jié)果表明：經(jīng)模壓形變后Cu-38Zn合金的晶粒細(xì)化不但與模壓形變時積累的等效應(yīng)變有關(guān)，而且與模壓形變時變形場的復(fù)雜性和試樣的尺寸有關(guān)。Cu-38Zn合金的晶粒尺寸隨著等效應(yīng)變的增大而減小，但是在相同的等效應(yīng)變下，復(fù)雜的變形場具有更有效的晶粒細(xì)化效果；較大尺寸的試樣具有更多的孿晶組織。
關(guān)鍵字: Cu-38Zn合金；模壓形變；有限元模擬；大塑性變形；晶粒細(xì)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
