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Deformation mechanisms and mechanical properties of porous magnesium/carbon nanofiber composites with different porosities

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Abstract

This study investigated mechanical properties and deformation mechanisms of porous magnesium–carbon nanofiber composites with different porosities manufactured through powder metallurgy. Compressive stress–strain curves of the samples exhibit three phases: Phase I of linear elastic deformation at low stress state, Phase II of a stress plateau, and Phase III of densification. The manufactured porous composites with different porosities show different deformation mechanisms. The composites with low porosity (i.e., 24 and 34%) manifest stretch-dominated deformation with hard (i.e., tension, compression) modes, while the composite with high porosity (i.e., 50%) demonstrates bending-dominated deformation with soft (i.e., bending) modes. The yield strength and the ultimate compressive strength decreased at an increasing rate with the increase in the porosity from 24 to 50%. Theoretical estimations were obtained for the yield strength of dense magnesium composites based on Gibson and Ashby model.

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Acknowledgement

The support for the research from the National Science Foundation under Award No. 1449607 is greatly appreciated.

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Authors and Affiliations

  1. School of Mechanical and Materials Engineering, Washington State University, Pullman, USA

    Huiru Xu & Qizhen Li

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  1. Huiru Xu
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  2. Qizhen Li
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Correspondence to Qizhen Li.

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Xu, H., Li, Q. Deformation mechanisms and mechanical properties of porous magnesium/carbon nanofiber composites with different porosities. J Mater Sci 53, 14375–14385 (2018). https://doi.org/10.1007/s10853-018-2649-x

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