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Understanding of large auxetic properties of iron-gallium and iron-aluminum alloys

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4 Author(s)
Zhang, Yan-ning ; Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA ; Wu, Ru-qian ; Schurter, Holly M. ; Flatau, Alison B.

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Large auxetic properties of iron-gallium and iron-aluminum alloys have been investigated with both theoretical and experimental approaches. Tensile tests of single-crystal iron-gallium alloys with compositions of 12%–25% gallium were conducted to determine the composition dependent values of the Poisson’s ratio. Systematic density functional calculations revealed a simple correlation between the Poisson’s ratio and tetragonal shear modulus. We attribute the auxetic properties of these intermetallic alloys to the drastic reduction in C with the presence of metalloid atoms in the DO3-type structures.

Published in:

Journal of Applied Physics  (Volume:108 ,  Issue: 2 )

Date of Publication:

Jul 2010

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