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Effect of Post-aging Heat Treatment on Strength and Local Corrosion Behavior of Ultrafine-Grained 2219 Al Alloy

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Abstract

The mechanical properties and local corrosion behavior of coarse-grained (CG) and ultrafine-grained (UFG) 2219 Al alloys with post-aging heat treatment have been investigated. The hardness and strength of UFG alloy were greatly higher and the susceptibility to intergranular corrosion was significantly lower compared with CG alloy. However, the exfoliation corrosion and electrochemical corrosion resistance of UFG alloy were lower than CG alloy. In addition, the local corrosion behavior of UFG alloys was less sensitive to post-aging conditions compared with CG alloy. The differences in mechanical properties and local corrosion behavior of UFG and CG 2219 Al alloy with post-aging heat treatment were mainly attributed to the complex interactions of grain size, dislocation and aging precipitates.

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Acknowledgments

The authors also acknowledge the financial support of Natural Science Foundation of Hunan Province of China (No. 2018JJ3645), National Key Research and Development Program of China (No.2016YFB0300801), Joint Funds of the National Natural Science Foundation of China(U1637601), State Key Laboratory of High Performance Complex Manufacturing of Central South University (No. ZZYJKT2017-02).

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Authors and Affiliations

  1. Light Alloy Research Institute, Central South University, Changsha, 410083, China

    Songyi Chen, Fushan Li, Qiang Liu & Kanghua Chen

  2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China

    Songyi Chen

  3. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, China

    Kanghua Chen & Lanping Huang

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  1. Songyi Chen
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Chen, S., Li, F., Liu, Q. et al. Effect of Post-aging Heat Treatment on Strength and Local Corrosion Behavior of Ultrafine-Grained 2219 Al Alloy. J. of Materi Eng and Perform 29, 3420–3431 (2020). https://doi.org/10.1007/s11665-020-04818-6

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