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李劲风,刘丹阳,马云龙,郑子樵.微量In对Al-Cu-1.0Li-(Mg)合金微观组织与拉伸性能的影响[J].稀有金属材料与工程(英文),2019,48(1):1~8.[Li Jin-feng,Liu Dan-yang,Ma Yun-long and Zheng Zi-qiao.Influence of small Indium (In) addition on microstructures and tensile properties of Al-Cu-1.0Li-(Mg) alloy[J].Rare Metal Materials and Engineering,2019,48(1):1~8.]
Influence of small Indium (In) addition on microstructures and tensile properties of Al-Cu-1.0Li-(Mg) alloy
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Received:August 23, 2017  Revised:March 14, 2018
DOI:
Key words: Al-Cu-Li alloy  Tensile property  Microstructure  Indium addition
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Author NameAffiliation
Li Jin-feng,Liu Dan-yang,Ma Yun-long and Zheng Zi-qiao  
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Abstract:
      The tensile properties, aging precipitate type and distribution in Al-Cu-Li-(0.35Mg)-(0.2In) alloy were investigated. In the T6 aged Al-Cu-Li alloy, the aging precipitate are T1(Al2CuLi) and ?? (Al2Cu). As 0.2%In is added, many square-shaped cubic precipitates Al5Cu6Li2 are formed at early aging stage and their size keeps stable with aging time extension. Meanwhile, ? ? precipitation is advanced. The alloy?s aging response is therefore accelerated and its strength is enhanced. The combined addition of In+Mg suppresses the precipitation of cubic Al5Cu6Li2, but plays a role in promoting T1 precipitation instead. This role is smaller than that of combined addition of Ag+Mg in Al-Cu-Li alloy 2050, which results in a lower strength of the In+Mg micro-alloyed Al-Cu-Li alloy than that of the Ag+Mg micro-alloyed Al-Cu-Li alloy 2050. At T8 temper, the role of both In independent addition and In+Mg combined addition is suppressed by the dislocations introduced by plastic deformation prior to artificial aging.