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桑冯建,郑子樵,王海金.Mn在2297铝锂合金中的微合金化作用[J].稀有金属材料与工程(英文),2018,47(3):871~877.[Sang Fengjian,Zheng Ziqiao,Wang Haijin.Micro-alloying Effects of Mn in 2297 Al-Li Alloy[J].Rare Metal Materials and Engineering,2018,47(3):871~877.]
Micro-alloying Effects of Mn in 2297 Al-Li Alloy
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Received:January 08, 2016  Revised:August 21, 2016
DOI:
Key words: 2297 Al-Li alloy  Mn  Al3Zr  recrystallization
Foundation item:国家重点基础研究发展计划(973计划)资助项目(2012CB619503);国家高技术研究发展计划(863计划)项目(2013AA032401)
Author NameAffiliationE-mail
Sang Fengjian School of Materials Science and Engineering,Central South University sang-fj@csu.edu.cn 
Zheng Ziqiao School of Materials Science and Engineering,Central South University s-maloy@mail.csu.edu.cn 
Wang Haijin School of Materials Science and Engineering,Central South University  
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Abstract:
      The effects of trace Mn addition on microstructure and mechanical properties of 2297 Al-Li alloy were investigated by optical microscopy, tensile test, scanning electron microscopy(SEM), transmission electron microscopy(TEM) and scanning transmission electron microscopy(STEM), fitted with high-angle annular dark field detector(HAADF). The results show that Mn exists in the form of AlCuMn rod-like dispersed particle and Al(CuMnFe) coarse phase in 2297 alloy. In addition, the Al(CuMnFe) phases in 2297 alloy are uniformly distributed and the size of the coarse particles is smaller than that in Mn-free alloy. As a result, the tensile strength of 2297 alloy was enhanced. The study indicates that the addition of Mn has no influence on the precipitation behavior of Al3Zr. And the level of recrystallization in 2297 alloy has not been changed, though the AlCuMn rod-like dispersed phases are precipitated.