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Impact of Cu/Mg Ratio on Thermal Stability of Hot Extrusion of Al-4.6 Pct Cu-Mg-Ag Alloys

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Abstract

This work explores how the Cu/Mg ratio affects the thermal stability of the extrusion of Al-4.6 pct Cu-Mg-Ag alloys at aerodynamic heating temperatures of up to 155 °C for 1000 hours. The Cu/Mg ratio was modified by adding various amounts of elemental Mg. The alloy microstructures, which determine thermal stability, were analyzed with an optical microscope, an electrical conductivity meter, a differential scanning calorimeter (DSC), and a transmission electron microscope. Experimental results indicate that reducing the Cu/Mg ratio of the alloy by the further addition of Mg causes Ω to become the primary strengthening phase after aging treatment, increasing the hardness and the thermal stability, although the θ′ phase is suppressed. The S phase does not affect the thermal stability of the alloy, because it is present in only a low quantity. Results of this study also demonstrate that the hot-extruded low Cu/Mg alloy satisfies the requirement of the material thermal stability of commercial supersonic aerial applications.

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  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Acknowledgments

The authors thank the Material and Electro-optics Research Division of the Chung-Sheng Institute of Science and Technology, Taiwan, Republic of China, for financially supporting this research under Contract No. NSC 92-2623-7-008-002. The authors also thank Mr. Yue Te Chen for his enthusiastic assistance with the experiment.

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Author notes

  1. Chih-Horng Chang (Graduate Student, Postdoctor Research)

    Present address: Ecole Centrale Nantes, Nantes, France

  2. Tiz-Yu Hsu (Graduate Student, Engineer)

    Present address: Vicom Technology Company, Taipei, Taiwan R.O.C.

Authors and Affiliations

  1. Department of Mechanical Engineering and Institute of Materials Science and Engineering, National Central University, Taoyuan Country, 32001, Taiwan, Republic of China

    Chih-Horng Chang (Graduate Student, Postdoctor Research), Sheng-Long Lee (Professor), Tiz-Yu Hsu (Graduate Student, Engineer) & Jing-Chie Lin (Professor)

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  1. Chih-Horng Chang
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  2. Sheng-Long Lee
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Correspondence to Chih-Horng Chang.

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Manuscript submitted October 21, 2006.

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Chang, CH., Lee, SL., Hsu, TY. et al. Impact of Cu/Mg Ratio on Thermal Stability of Hot Extrusion of Al-4.6 Pct Cu-Mg-Ag Alloys. Metall Mater Trans A 38, 2832–2842 (2007). https://doi.org/10.1007/s11661-007-9332-1

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  • DOI: https://doi.org/10.1007/s11661-007-9332-1

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