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Rare Metals

, Volume 38, Issue 12, pp 1136–1143 | Cite as

Processing maps and microstructural evolution of Al–Cu–Li alloy during hot deformation

  • Sheng-Li Yang
  • Jian ShenEmail author
  • Yong-An Zhang
  • Zhi-Hui Li
  • Xi-Wu Li
  • Shu-Hui Huang
  • Bai-Qing Xiong
Article

Abstract

The hot deformation behavior of Al–Cu–Li alloy was investigated by hot compression tests in the temperature range of 340–500 °C with strain rate of 0.001–10.000 s−1. Based on the dynamic materials model (DMM), processing maps of the test alloy were developed for optimizing hot processing parameters. The optimum parameters of hot deformation for Al–Cu–Li alloy are at temperature of 400–430 °C and strain rate of about 0.100 s−1, with efficiency of power dissipation of around 30%. The microstructural manifestation of the alloy deformed in instability domains is flow localization, and dynamic softening first occurs in flow localizations structure. In stable domains, dynamic recovery (DRV) and dynamic recrystallization (DRX) are the main microstructural evolution mechanism. DRX is gradually strengthened with the increase in deformation temperature and the decrease in strain rate. During hot deformation, the DRX mechanism of Al–Cu–Li alloy is dominated by continuous DRX (CDRX). A DRX model of Al–Cu–Li alloy is proposed based on the microstructural evolution process of the test alloy.

Keywords

Al–Cu–Li alloy Processing map Dynamic recovery and dynamic recrystallization Microstructural evolution 

Notes

Acknowledgements

This study was financially supported by the National Program on Key Basic Research Project of China (No. 2012CB619504) and the National Natural Science Foundation of China (No. 51274046).

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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.State Key Laboratory of Nonferrous Metals and ProcessesGeneral Research Institute for Nonferrous MetalsBeijingChina

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