Influence of non-isothermal aging on mechanical properties and microstructures of an Al-Li alloy

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Influence of non-isothermal aging on mechanical properties and microstructures of an Al-Li alloy
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Affiliation:Central South University,Aerospace Research Institute of Materials and Processing Technology
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Fund Project: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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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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[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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Received:October 09,2014
Revised:November 17,2014
Adopted:December 25,2014
Online: March 16,2017
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