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Interface Effects on the Fracture Mechanism of a High-Toughness Aluminum-Composite Laminate

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Abstract

The microstructure and the mechanical properties of a multilayer composite laminate based on aluminum 7075 and 2024 alloys produced by hot roll bonding were examined. The composite laminate has been tested at room temperature under Charpy-impact tests, three-point bend tests, and shear tests on the interfaces. The toughness of the post-rolling tempered and T6-treated composite laminate, measured by impact- absorbed energy in the crack-arrester orientation, was more than 20 times higher than that of the monolithic Al 7075 alloy and 7 times higher than that of Al 2024 alloy. The outstanding toughness increase of the composite laminate in the post-rolling tempered and T6-treated condition is mainly due to the mechanism of “interface predelamination.” By this fracture mechanism, the interfaces are debonded before the main crack reaches them, warranting delamination in all interfaces. Therefore, delamination and crack renucleation in every layer are responsible for the improvement in toughness.

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Notes

  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  2. Oxford Inca is a trademark of Oxford Instruments, Oxfordshire, UK.

  3. Servosis is a trademark of Servosis S.A., Pinto, Spain.

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Acknowledgments

The authors thank CICYT (Project No. MAT2003-01172) for financial support. Two of the authors (CMCJ and JMGI) thank the Spanish Ministry of Education and Science for a Juan de la Cierva contract and a FPI fellowship, respectively. The authors also thank L. del Real-Alarcón for the welding work, F.F. González-Rodríguez for assistance during hot rolling, and J. Chao-Hermida for assistance with the Charpy-impact test.

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Authors and Affiliations

  1. Departamento de Metalurgia Física, CENIM, CSIC, 28040, Madrid, Spain

    C.M. Cepeda-Jiménez (Postdoctoral Researcher), J.M. García-Infanta (Postdoctoral Researcher), O.A. Ruano (Professor) & F. Carreño (Staff Researcher)

  2. Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095-1595, USA

    M. Pozuelo (Postdoctoral Researcher)

Authors
  1. C.M. Cepeda-Jiménez
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  2. M. Pozuelo
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  3. J.M. García-Infanta
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  4. O.A. Ruano
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  5. F. Carreño
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Correspondence to C.M. Cepeda-Jiménez.

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Manuscript submitted January 10, 2008.

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Cepeda-Jiménez, C., Pozuelo, M., García-Infanta, J. et al. Interface Effects on the Fracture Mechanism of a High-Toughness Aluminum-Composite Laminate. Metall Mater Trans A 40, 69–79 (2009). https://doi.org/10.1007/s11661-008-9679-y

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  • DOI: https://doi.org/10.1007/s11661-008-9679-y

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