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Relationship between fracture toughness, fracutre path, and microstructure of 7050 aluminum alloy: Part II. Multiple micromechanisms-based fracture toughness model

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Abstract

A multiple micromechanisms-based model is developed to quantitatively relate the fracture toughness of partially recrystallized 7XXX aluminum alloys to their fracture surface morphology. The model is verified using the experimental data on partially recrystallized 7050 alloy reported in the companion article. It is then used to obtain a quantitative relationship between the fracture toughness and microstructural attributes. The model relates fracture toughness to microstructural parameters such as degree of recrystallization, grain size of recrystallized grains, thickness of recrystallized regions, total surface area of the constituent particles per unit volume, and microstructural anisotropy. The model predicts the changes in the fracture toughness with the specimen orientation.

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Authors and Affiliations

  1. the School of Materials Science and Engineering, Georgia Institute of Technology, 30332-0245, Atlanta, GA

    A. M. Gokhale (Professor)

  2. Cessna Aircraft Co., 67277-7704, Wichita, KS

    N. U. Deshpande (Engineer)

  3. the Alcoa Technical Center, 15069, Alcoa Center, PA

    D. K. Denzer (Staff Engineer) & John Liu (Senior Technical Specialist)

Authors
  1. A. M. Gokhale
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  2. N. U. Deshpande
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  3. D. K. Denzer
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  4. John Liu
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Gokhale, A.M., Deshpande, N.U., Denzer, D.K. et al. Relationship between fracture toughness, fracutre path, and microstructure of 7050 aluminum alloy: Part II. Multiple micromechanisms-based fracture toughness model. Metall Mater Trans A 29, 1203–1210 (1998). https://doi.org/10.1007/s11661-998-0247-2

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  • DOI: https://doi.org/10.1007/s11661-998-0247-2

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