Strong, lightweight, and recoverable three-dimensional ceramic nanolattices

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Science  12 Sep 2014:
Vol. 345, Issue 6202, pp. 1322-1326
DOI: 10.1126/science.1255908

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  1. Fig. 1 Architecture, design, and microstructure of alumina nanolattices.

    (A) CAD image of the octet-truss design used in the study. The blue section represents a single unit cell. (B) Cutaway of hollow octet-truss unit cell. (C) Hollow elliptical crosssection of a nanolattice tube. (D) SEM image of alumina octet-truss nanolattice. (E) Zoomed-in section of the alumina octet-truss nanolattice. The inset shows an isolated hollow tube. (F) TEM dark-field image with diffraction grating of the alumina nanolattice tube wall.

  2. Fig. 2 Compression experiments on thick- and thin-walled nanolattices.

    (A to E) Mechanical data and still frames from the compression test on a thin-walled (L = 5 μm, a = 650 nm, t = 10 nm) nanolattice demonstrating the slow, ductile-like deformation, local shell buckling, and recovery of the structure after compression. (F to J) Mechanical data and still frames from the compression test on a thick-walled (L = 5 μm, a = 790 nm, t = 50 nm) nanolattice showing catastrophic brittle failure and no post-compression recovery.

  3. Fig. 3 Mechanical tests on varying wall thickness and relative density samples.

    (A to D) Stress-strain plots of structures with varying wall thicknesses in showing the transition from brittle to ductile-like deformation in thinner-walled structures. (E to J) Post-compression images of the nanolattices showing the recoverability as wall thickness is reduced.

  4. Fig. 4 Strength and stiffness versus density of alumina nanolattices.

    (A and B) Stiffness and strength plotted against relative density for all tested samples. Data clearly obey a power law, with little deviation across wall thicknesses and failure modes. (C and D) Material property plots (Materials Property CES Selector software by Granta Design) of the experimental stiffness and strength data against density for existing materials, showing that the materials created in this work reach a new niche in the high-strength and -stiffness lightweight material parameter space.

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