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

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Abstract

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°C for 12 h followed by aging at 220 and 240°C were chosen by determining the peak temperature of δ′ precipitation at 230°C by DSC. The retrogression treatment at a lower temperature of 220°C 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°C 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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Authors and Affiliations

  1. Grikin Advanced Materials Co. Ltd., General Research Institute for Non-Ferrous Metals, Beijing, 100088, China

    Zhi-shan Yuan

  2. Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Zhi-shan Yuan, Zheng Lu, Xiu-liang Wu, You-hua Xie & Sheng-long Dai

  3. School of Materials & Metallurgy, Northeastern University, Shenyang, 110004, China

    Chang-sheng Li

Authors
  1. Zhi-shan Yuan
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  2. Zheng Lu
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  3. Xiu-liang Wu
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  4. You-hua Xie
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  5. Sheng-long Dai
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  6. Chang-sheng Li
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Correspondence to Zhi-shan Yuan.

Additional information

This work was financially supported by the Major State Basic Research Development Program of China (No.2005CB623705).

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Yuan, Zs., Lu, Z., Wu, Xl. et al. Retrogression characteristics of a novel Al-Cu-Li-X alloy. Int J Miner Metall Mater 17, 624–628 (2010). https://doi.org/10.1007/s12613-010-0365-x

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  • DOI: https://doi.org/10.1007/s12613-010-0365-x

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