(1. 福建船政交通職業(yè)技術(shù)學(xué)院 汽車運(yùn)用與工程機(jī)械系，福州 350007；
2. 福州大學(xué) 材料科學(xué)與工程學(xué)院，福州 350108；
3. 福建工程學(xué)院 材料科學(xué)與工程系，福州 350108)
摘 要: 設(shè)計(jì)平行模壓變形、180°交叉模壓變形、90°交叉模壓變形對(duì)1060純鋁進(jìn)行系列限制模壓變形(CGP)試驗(yàn)，采用透射電鏡研究該材料在不同變形工藝下的組織演化規(guī)律和晶粒細(xì)化速率。結(jié)果表明：變形工藝不影響組織的演化規(guī)律，但顯著影響晶粒細(xì)化速率、晶粒細(xì)化效果以及大角度晶界的形成；90°交叉模壓變形最優(yōu)。在相同的變形溫度、變形速率和應(yīng)變累積條件下，所能達(dá)到的晶粒細(xì)化速率和大角度晶界的數(shù)量取決于剪切變形模式。
關(guān)鍵字: 1060純鋁；限制模壓變形；1060純鋁；組織演化；晶粒細(xì)化；細(xì)化機(jī)理
1060 pure Al processed by constrained groove pressing
（1. Department of Mechanical Engineering, Fujian Chuanzheng Communications College, Fuzhou 350007, China;
2. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
3. Department of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350108, China）
Abstract:In order to well understand the role of the accumulative strain and the effects of shear strain plane in the grain refinement during constrained groove pressing (CGP), the microstructural evolution and the grain refinement rate of 1060 aluminum alloy processed by CGP, such as parallel CGP, 180° cross CGP and 90° cross CGP, were investigated by transmission electron microscopy. The results show that the microstructural evolution is independent of the pressing conditions. But the processing conditions significantly affect the grain refinement rate, final grain size and boundaries misorientation, and the 90° cross CGP is the most effective. It is reasonable to conclude that, in the same pressing temperature, strain rate and accumulative strain, the grain refinement rate, final grain size and boundaries misorientation are determined by the shear strain plane.
Key words: 1060 pure Al; constrained groove pressing; microstructure evolution; grain refinement; refinement mechanism
