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Study on the Strengthening Mechanism of Two-Stage Double-Peaks Aging in 7075 Aluminum Alloy

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Abstract

The mechanical properties and microstructure of 7075 aluminum alloy during the two-stage aging process have been studied by means of Rockwell hardness test, tensile test, X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM) and high-resolution TEM. The results illustrated that there existed double peaks for both the hardness and strength in 7075 aluminum alloy during the two-stage aging process. Furthermore, the aging time to reach the second peak was obviously shortened compared to single-stage aging process. At the first peak aging state, the strengthening effect of the alloy was dominated by high-density GP zones, but η′ phase (MgZn2) was mainly the strengthening phase at the second peak aging state.

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Acknowledgements

The financial aid of the National Natural Science Foundation of China under Grant No. 51871031 is gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China

    S. W. Cai & R. G. Song

  2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, Jiangsu, China

    S. W. Cai & R. G. Song

  3. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China

    S. W. Cai & R. G. Song

  4. School of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, 310032, China

    Y. He

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  1. S. W. Cai
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  2. Y. He
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  3. R. G. Song
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Correspondence to R. G. Song.

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Cai, S.W., He, Y. & Song, R.G. Study on the Strengthening Mechanism of Two-Stage Double-Peaks Aging in 7075 Aluminum Alloy. Trans Indian Inst Met 73, 109–117 (2020). https://doi.org/10.1007/s12666-019-01809-7

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  • DOI: https://doi.org/10.1007/s12666-019-01809-7

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