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A Comprehensive Study on the Effect of Retrogression and Re-Aging on the Properties of Aluminium Alloy Conforming to AA 7049 Specification

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Light Metals 2015

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Abstract

The Al-Zn-Mg-Cu alloys have been widely used as aircraft structure materials because of their high strength to density ratio. These alloys in the T6 temper are known to be highly susceptible to stress corrosion cracking (SCC). In the present investigation, a comprehensive study on the effect of RRA treatment on the strength and corrosion properties of AA 7049 aluminium alloy has been made. The retrogression heat treatment is varied from 2 min to 60 min at temperatures between 1800C and 2400C; the re-aging treatment was done for 24 hours at 1200C. Within the scope of this investigation, the results indicate that, the susceptibility for corrosion can be decreased by subjecting the alloy for RRA treatment. It is found that the grain boundary precipitate coarsening and enrichment of copper in the grain boundary precipitate are the factors responsible for improvement in reducing susceptibility to SCC.

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Author information

Authors and Affiliations

  1. Mechanical Engineering, University Visvesvaraya College of Engineering, K. R Road, Bangalore, 560 001, India

    B. K. Muralidhara

  2. Mechanical Engineering, Sri Jagadguru Chandrasekarananthaswamiji Institute of Technology, Chikkaballapura, 562 101, India

    R. Ranganatha

Authors
  1. B. K. Muralidhara
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  2. R. Ranganatha
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Editor information

Editors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Auckland, New Zealand

    Margaret Hyland (professor; Deputy Dean of the Faculty of Engineering; and a principal investigator in the Light Metals Research Centre; Ph.D. in Chemistry) (professor; Deputy Dean of the Faculty of Engineering; and a principal investigator in the Light Metals Research Centre; Ph.D. in Chemistry)

  2. University of Western Ontario, Canada

    Margaret Hyland (professor; Deputy Dean of the Faculty of Engineering; and a principal investigator in the Light Metals Research Centre; Ph.D. in Chemistry) (professor; Deputy Dean of the Faculty of Engineering; and a principal investigator in the Light Metals Research Centre; Ph.D. in Chemistry)

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© 2015 TMS (The Minerals, Metals & Materials Society)

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Muralidhara, B.K., Ranganatha, R. (2015). A Comprehensive Study on the Effect of Retrogression and Re-Aging on the Properties of Aluminium Alloy Conforming to AA 7049 Specification. In: Hyland, M. (eds) Light Metals 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48248-4_59

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