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Effects of Post-weld Heat Treatment on Microstructure and Mechanical Behavior of Friction Stir Welded Thick Section Al–Zn–Mg–Cu Alloy

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Advances in Engineering Design

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

Friction stir welding is considered to be a promising solution to successfully join high strength 7000 series aluminum alloys. However, questions related to a decrease in weld mechanical properties with an increase in plate thickness still remain unanswered. In this study, 16 mm thick AA7075–T651 aluminum alloy plates were successfully joined by friction stir welding. The welds were heat treated using a special solutionizing method called cyclic solution treatment (CST). The effects of CST on mechanical behavior and microstructures of the welds were studied using hardness, tensile, and impact tests and optical microscopy. The post-weld heat treatment significantly improves the hardness of the joint and homogenizes the hardness distribution across the welded joint. However, the tensile properties and impact toughness of the welds were not found to be beneficially affected. A significant grain growth in the weld nugget was observed after CST.

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, Sir CRR College of Engineering, Eluru, 534007, Andhra Pradesh, India

    T. Ramakrishna

  2. Department of Mechanical Engineering, MVGR College of Engineering, Vizianagaram, 535005, Andhra Pradesh, India

    S. Srinivasa Rao

  3. Department of Metallurgical Engineering, University College of Engineering, JNTUK, Vizianagaram, 535005, Andhra Pradesh, India

    G. Swami Naidu

Authors
  1. T. Ramakrishna
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  2. S. Srinivasa Rao
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  3. G. Swami Naidu
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Corresponding author

Correspondence to T. Ramakrishna .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, South Dakota State University, Brookings, SD, USA

    Anamika Prasad

  2. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh, India

    Shakti S. Gupta

  3. Department of Mechanical Engineering, Amity University, Noida, Uttar Pradesh, India

    R. K. Tyagi

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Ramakrishna, T., Srinivasa Rao, S., Swami Naidu, G. (2019). Effects of Post-weld Heat Treatment on Microstructure and Mechanical Behavior of Friction Stir Welded Thick Section Al–Zn–Mg–Cu Alloy. In: Prasad, A., Gupta, S., Tyagi, R. (eds) Advances in Engineering Design . Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-6469-3_3

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  • DOI: https://doi.org/10.1007/978-981-13-6469-3_3

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-13-6468-6

  • Online ISBN: 978-981-13-6469-3

  • eBook Packages: EngineeringEngineering (R0)

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