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Influence of small Indium (In) addition on microstructures and tensile properties of Al-Cu-1.0Li-(Mg) alloy
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Central South University

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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.

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[Li Jin-feng, Liu Dan-yang, Ma Yun-long, 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.]
DOI:10.12442/j. issn.1002-185X. e20170135

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History
  • Received:August 23,2017
  • Revised:March 14,2018
  • Adopted:August 31,2018
  • Online: February 18,2019
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