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Deformation Behavior of the Percolating Intermetallic Microstructure of High Pressure Die Cast AZ91 Alloy

Authors

  • Bao Zhang,

    1. ARC Centre of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Australia
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  • Anumalasetty V. Nagasekhar,

    1. ARC Centre of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Australia
    Current affiliation:
    1. Carpenter Technology Corporation, Reading, PA, USA
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  • Tharmalingam Sivarupan,

    1. CAST Co-operative Research Centre, Materials Engineering, School of Engineering, The University of Queensland, Australia
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  • Carlos H. Caceres

    Corresponding author
    1. ARC Centre of Excellence for Design in Light Metals, Materials Engineering, School of Engineering, The University of Queensland, Australia
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Abstract

The intermetallic microstructure in two representative regions of the cross section, the corner and the core, of a cast-to-shape tensile specimen was studied. Available 3D data of the intermetallic, obtained with focused dual ion beam tomography, were incorporated into a finite element code to simulate the deformation behavior. The modeling reveals a high structural compliance at both the corner and the core, akin to the bending-dominated behavior of cellular foams. The high compliance suggests that the percolating microstructure should keep most of its structural integrity, reinforcing the alloy without compromising the ductility, for strains above 1%. Scanning electron microscope observations of the damage by cracking of the intermetallic along the gauge of a tensile specimen deformed to fracture supported this prediction.

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