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Effect of Retrogression Heat Treatment Time on Microstructure and Mechanical Properties of AA7010

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Abstract

The effect of retrogression time during retrogression and re-aging (RRA) treatment of AA7010 is evaluated by performing tensile tests and characterizing the microchemistry of the grain boundary precipitates (GBPs) using transmission electron microscope coupled with the energy-dispersive spectroscopy. Retrogression time is evaluated so that the ultimate tensile strength of the RRA-treated sample is equal to that of the T6-treated sample and the grain boundary microstructure similar to that of the over-aged (T7451) condition. The investigation reveals that the sample retrogressed at 200 °C for 20 min has UTS of 586 MPa which is equivalent to that of the T6 sample and 11.5% higher than that of the T7451 condition. The fracture toughness of the RRA-treated sample was 41 MPa√m. Microstructure of the RRA-treated sample is similar to T7451, along the grain boundaries and in the grain interior similar to that of the T6-treated sample. Energy-dispersive spectroscopy confirmed the increment of Cu content on the GBP’s with increase in the retrogression time, which is expected to improve the stress corrosion cracking resistance of the alloy.

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Acknowledgments

Authors are thankful to The Director, NITK, and The Director, CSIR-NAL, for facilitating to conduct this research work and also for their continuous encouragement. One of the authors Mr. Nandana would like to thank the MHRD-Government of India for providing the scholarship grant. The technical staff at the Department of Metallurgical and Materials Engineering, NITK, is thanked for their support.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, India

    M. S. Nandana & K. Udaya Bhat

  2. Structural Technologies Division, CSIR-National Aerospace Laboratories, Bangalore, India

    C. M. Manjunatha

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  1. M. S. Nandana
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  2. K. Udaya Bhat
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  3. C. M. Manjunatha
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Correspondence to K. Udaya Bhat.

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Nandana, M.S., Udaya Bhat, K. & Manjunatha, C.M. Effect of Retrogression Heat Treatment Time on Microstructure and Mechanical Properties of AA7010. J. of Materi Eng and Perform 27, 1628–1634 (2018). https://doi.org/10.1007/s11665-018-3268-z

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  • DOI: https://doi.org/10.1007/s11665-018-3268-z

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