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微量In對(duì)Al-Cu-1.0Li-(Mg)合金微觀組織與拉伸性能的影響
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中南大學(xué)材料科學(xué)與工程學(xué)院

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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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    摘要:

    研究了Al-Cu-Li-(0.35Mg)-(0.2In)合金的拉伸性能、時(shí)效析出相類型及其分布。T6峰時(shí)效時(shí)，Al-Cu-Li合金的時(shí)效析出相為T1(Al2CuLi)和?? (Al2Cu)相。添加0.2%In時(shí)，T6態(tài)時(shí)效早期形成許多方塊狀的立方相Al5Cu6Li2，且隨時(shí)間延長(zhǎng)其尺寸保持穩(wěn)定；同時(shí)，可促進(jìn)? ?相析出；相應(yīng)合金的時(shí)效響應(yīng)加速，強(qiáng)度提高。同時(shí)添加In和Mg可抑制Al5Cu6Li2相析出，但促進(jìn)T1相析出。In和Mg的復(fù)合微合金化效果小于2050鋁鋰合金中Ag和Mg的復(fù)合微合金化效果，因而In+Mg復(fù)合微合金化鋁鋰合金T6態(tài)強(qiáng)度低于Ag+Mg復(fù)合微合金化的2050鋁鋰合金。T8態(tài)時(shí)效時(shí)，時(shí)效前預(yù)變形產(chǎn)生的位錯(cuò)抑制了In元素單獨(dú)添加和In+Mg復(fù)合添加的微合金化效果。

    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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李勁風(fēng),劉丹陽(yáng),馬云龍,鄭子樵.微量In對(duì)Al-Cu-1.0Li-(Mg)合金微觀組織與拉伸性能的影響[J].稀有金屬材料與工程,2019,48(1):1~8.[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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  • 收稿日期:2017-08-23
  • 最后修改日期:2018-03-14
  • 錄用日期:2018-08-31
  • 在線發(fā)布日期: 2019-02-18
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