Zhi-shan Yuan, Zheng Lu, Xiu-liang Wu, You-hua Xie, Sheng-long Dai,  and Chang-sheng Li, Retrogression characteristics of a novel Al-Cu-Li-X alloy, Int. J. Miner. Metall. Mater., 17(2010), No. 5, pp. 624-628. https://doi.org/10.1007/s12613-010-0365-x
Cite this article as:
Zhi-shan Yuan, Zheng Lu, Xiu-liang Wu, You-hua Xie, Sheng-long Dai,  and Chang-sheng Li, Retrogression characteristics of a novel Al-Cu-Li-X alloy, Int. J. Miner. Metall. Mater., 17(2010), No. 5, pp. 624-628. https://doi.org/10.1007/s12613-010-0365-x

Retrogression characteristics of a novel Al-Cu-Li-X alloy

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  • Corresponding author:

    Zhi-shan Yuan    E-mail: yuanzs@163.com

  • Received: 5 August 2009Revised: 1 September 2009Accepted: 15 September 2009
  • Retrogression characteristics of a novel Al-Cu-Li-X alloy of 2A97 were studied by hardness testing, transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). The retrogression treatments of aging at 155℃ for 12 h followed by aging at 220 and 240℃ were chosen by determining the peak temperature of δ' precipitation at 230℃ by DSC. The retrogression treatment at a lower temperature of 220℃ causes the precipitation and coarsening of δ' and θ' phases in the matrix, resulting in an increase in hardness. Retrogression at a higher temperature of 240℃ causes the dissolution and coarsening of δ' and θ' precipitates in the matrix and on the grain boundaries, resulting in a decrease in hardness. Microstructural changes upon retrogression including the appearance of equilibrium precipitates such as T1, T2, δ', and θ are confirmed by the selected area electron diffraction and the bright and dark field image analysis.
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