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Improving Compressive Failure Strain and Work of Fracture of Magnesium by Integrating it with Millimeter Length Scale Aluminum

Department of Mechanical Engineering, National University of Singapore 9 Engineering Drive 1, Singapore 117576

M. Gupta

Department of Mechanical Engineering, National University of Singapore 9 Engineering Drive 1, Singapore 117576, mpegm{at}nus.edu.sg

N. Srikanth

Centre for Management of Science and Technology, Department of Industrial and Systems Engineering, National University of Singapore 7 Engineering Drive 1, Singapore 117574

Solidification processing followed by hot coextrusion was used to fabricate a bimetal magnesium/aluminum macrocomposite containing millimeter-scale Al core reinforcement. Microstructural characterization revealed limited interfacial interdiffusion of both metals into each other. Compressive testing revealed that the presence of Al core does not affect 0.2%YS, marginally decreases ultimate compressive strength (UCS), and significantly increases failure strain (115%) and work of fracture (55%) of Mg. The effect of the presence of mm-scale Al core on the compressive properties of the bimetal macrocomposite is investigated in this article.

Key Words: magnesium • aluminum • macrocomposite • interface • Compressive properties.

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