| Effect of electric current pulse on grain growth in superplastic deformation of 2091 Al-Li alloy |
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| 引用本文： | 刘志义,许晓嫦,崔建忠. Effect of electric current pulse on grain growth in superplastic deformation of 2091 Al-Li alloy[J]. 中国有色金属学会会刊, 2003, 13(4) |
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| 作者姓名： | 刘志义 许晓嫦 崔建忠 |
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| 作者单位： | School of Materials Science and Engineering，School of Materials Science and Engineering，School of Metallurgy and Materials Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Northeast University，Shenyang 110006，China |
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| 摘 要： | 1 INTRODUCTIONThecharacteristicthatelectriccurrentpulsepro motesatomdiffusionanddislocationmotionwasgrad uallyrecognizedfromthefailureanalysisonintegrat edcircuitin 1970s[110 ] .Theelectriccurrentpulsewasusedtoincrease plastic property ,improvetheformabilityofless deformablemetals[11,12 ] ,andstudytheeffectsofcurrentpulseonrecrystallization[1318]respectivelyin 1980s .Inthisrespect ,ConradandLaihavedonealotofwork ,inwhichCu ,AlandTiweremainexperimentalmaterialsfordeformationemployedwitha…
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Effect of electric current pulse on grain growth in superplastic deformation of 2091 Al-Li alloy |
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| LIU Zhi yi ,XU Xiao chang ,CUI Jian zhong. Effect of electric current pulse on grain growth in superplastic deformation of 2091 Al-Li alloy[J]. Transactions of Nonferrous Metals Society of China, 2003, 13(4) |
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| Authors: | LIU Zhi yi XU Xiao chang CUI Jian zhong |
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| Affiliation: | LIU Zhi yi 1,XU Xiao chang 1,CUI Jian zhong 2 |
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| Abstract: | The effect of electric current pulse on the grain growth in the superplastic deformation of 2091 Al Li alloy was investigated. Optical metallographic microstructure observation and average linear intercept measuring results show that at same strain, the grain size in the superplastic deformation loaded with electric current pulse is smaller than that unemploying electric current pulse, and so does the grain growth rate. TEM observation shows that the dislocation density at grain boundary in the superplastic deformation applied with electric current pulse is lower than that unemploying electric current pulse.It indicates that electric current pulse increases the rate of dislocation slip and climb in grain boundary, which leads to a decrease of both the density of the dislocation slipping across grain boundary at same strain rate and the driving force for grain growth, therefore the rate of grain growth decreases.The established model for grain growth shows an exponential relation of grain size with strain. |
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| Keywords: | Al Li alloy grain growth current pulse superplastic deformation |
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