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Effect of Pre-strain on the Solute Clustering, Mechanical Properties, and Work-Hardening of a Naturally Aged Al-Cu-Mg Alloy

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Abstract

The effect of pre-strain on the solute clustering, mechanical properties, and work-hardening of a naturally aged Al-Cu-Mg alloy was comprehensively investigated using a three-dimensional atom probe, electrical resistivity, and hardness measurements. The pre-strain promoted the rapid formation of solute clusters but suppressed the growth of solute clusters during prolonged aging. An increase in pre-strain caused a decrease in the saturated number density of solute clusters, leading to a reduction in cluster strengthening. By taking into account the coupling effect of solute clusters and pre-existing dislocations, models were proposed to address the yield strength and work-hardening behaviors of the Al-Cu-Mg alloy, respectively. It reveals that the solute-cluster strengthening is comparable to dislocation strengthening in the naturally aged alloy. However, the work hardening is not significantly affected by the presence of the solute clusters. The findings reported in this paper will be helpful for the development of a naturally aged Al-Cu-Mg alloy with improved performance by controlling the pre-strain.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51321003, 51322104, 51171142, and 51201133), the National Basic Research Program of China (973 program, Grant No. 2010CB631003 and 2012CB619600), China Natural Funds for Distinguished Young Scholars and the 111 Project of China (B06025). GL acknowledges the financial support of Fundamental Research Funds for the Central Universities and TengFei Scholar project. JYZ acknowledges the China Postdoctoral Science Foundation (2012M521765) and Shaanxi Province Postdoctoral Scientific Research Projects for a portion of the financial support.

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    D. Shao, P. Zhang, J. Y. Zhang, G. Liu & J. Sun

  2. School of Materials Science and Engineering, Xi’an University of Technology, Xi’an, 710048, China

    R. H. Wang

  3. Key Laboratory for Microstructure, Shanghai University, Shanghai, 200444, China

    W. Q. Liu

  4. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    G. Sha

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  1. D. Shao
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Correspondence to G. Liu, G. Sha or J. Sun.

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Manuscript submitted January 4, 2017.

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Shao, D., Zhang, P., Zhang, J.Y. et al. Effect of Pre-strain on the Solute Clustering, Mechanical Properties, and Work-Hardening of a Naturally Aged Al-Cu-Mg Alloy. Metall Mater Trans A 48, 4121–4134 (2017). https://doi.org/10.1007/s11661-017-4204-9

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