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非等溫時(shí)效對一種鋁鋰合金力學(xué)性能與微觀組織的影響
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中南大學(xué),航天材料及工藝研究所

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國家高技術(shù)研究發(fā)展計(jì)劃（863計(jì)劃，項(xiàng)目號2013AA032401)，中南大學(xué)教師基金(項(xiàng)目號2013JSJJ 001)


Influence of non-isothermal aging on mechanical properties and microstructures of an Al-Li alloy
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Central South University,Aerospace Research Institute of Materials and Processing Technology

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Al and Mg Light Alloys Platform on the Integration of Industry, Education and Research of Guangdong Province (2012B090600051); Science and Technology Innovation Fund for the Guangzhou Research Institute of Non-ferrous Metals (2013A005)

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    摘要:

    論文比較研究了一種Mg、Ag、Zn多元復(fù)合微合金化鋁鋰合金等溫T8時(shí)效及非等溫（降溫）T8時(shí)效時(shí)的微觀組織與力學(xué)性能。結(jié)果表明，該鋁鋰合金主要時(shí)效強(qiáng)化相為T1相（Al2CuLi），同時(shí)還存在??相（Al2Cu）及??相（Al3Li）相的補(bǔ)充強(qiáng)化作用。相比于等溫T8時(shí)效而言，降溫T8時(shí)效可在不降低延伸率的同時(shí)，提高鋁鋰合金的強(qiáng)度。另外，降溫T8時(shí)效時(shí)T1相析出及生長速度較慢，而且峰時(shí)效時(shí)??相及??相含量較高，補(bǔ)充強(qiáng)化作用更大。

    Abstract:

    The mechanical properties and micro-structures of a Mg, Ag and Zn multi-microalloyed Al-Li alloy with isothermal T8 aging and non-isothermal (cooling) T8 aging were studied. The results showed that the main strengthening precipitates were T1 (Al2CuLi), some ?? (Al2Cu) and ??(Al3Li) precipitates played a supplementary strengthening effect. Compared to the isothermal T8 aging, the cooling T8 aging enhanced the Al-Li alloy strength but did not lower its elongation. In addition, the precipitation and growth of T1 precipitates were slower during cooling T8 aging process due to its lowered temperature. Meanwhile, the fraction of ?? and ?? precipitates were higher in the alloy with cooling T8 peak aging, which caused a higher supplementary strengthening effect.

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李勁風(fēng),陳永來.非等溫時(shí)效對一種鋁鋰合金力學(xué)性能與微觀組織的影響[J].稀有金屬材料與工程,2017,46(1):183~188.[Li Jin-feng, Chen Yong-lai. Influence of non-isothermal aging on mechanical properties and microstructures of an Al-Li alloy[J]. Rare Metal Materials and Engineering,2017,46(1):183~188.]
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  • 收稿日期:2014-10-09
  • 最后修改日期:2014-11-17
  • 錄用日期:2014-12-25
  • 在線發(fā)布日期: 2017-03-16
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