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Influence of predeformation on microstructure evolution of superplastically formed Al 5083 alloy

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Abstract

Cavitation is the main defect encountered during superplastic forming (SPF) of thin sheet aluminum alloys. In the present paper, the influence of preforming operation (cold or hot) on the superplastic forming ability and quality of 1.6-mm-thick sheet of 5083 SPF aluminum alloy is investigated. Specifically, grain size evolution and the characteristics of the cavitation process are discussed as a function of prior deformation and the preforming temperature. Optical and field emission gun scanning electron microscopy (FEG-SEM) were used to study the characteristics of the cavities and microstructure evolution. Image processing was used to measure the surface and volume fractions of the cavities. The results indicate that hot preforming leads to a lower number of cavities per unit surface compared to cold preforming prior to the SPF operation. However, the average cavity sizes and the average grain size are higher in the case of hot preforming compared to cold preforming, which lead to higher susceptibility to crack formation and reduced SPF ability of the alloy.

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Authors and Affiliations

  1. Département de génie mécanique, École de technologie supérieure, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canada

    S. M. Chentouf, T. Belhadj & M. Jahazi

  2. Verbom Inc., 5066, Route 222 C.P.3240, Valcourt, QC, J0E 2L0, Canada

    N. Bombardier

  3. McGill University, Wong Building, 3610 University Street, Montreal, QC, H3A 0C5, Canada

    N. Brodusch & R. Gauvin

Authors
  1. S. M. Chentouf
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  2. T. Belhadj
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  3. N. Bombardier
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  4. N. Brodusch
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  5. R. Gauvin
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  6. M. Jahazi
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Correspondence to T. Belhadj.

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Chentouf, S.M., Belhadj, T., Bombardier, N. et al. Influence of predeformation on microstructure evolution of superplastically formed Al 5083 alloy. Int J Adv Manuf Technol 88, 2929–2937 (2017). https://doi.org/10.1007/s00170-016-9006-5

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  • DOI: https://doi.org/10.1007/s00170-016-9006-5

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