Multilayered Cellular Metallic Glass Structures

Abstract

Multi-layered cellular metallic glass structures and methods of preparing the same are provided. In one embodiment, the cellular metallic glass structure includes at least one patterned metallic glass sheet and at least one additional sheet. The at least one patterned metallic glass sheet may include multiple sheets connected together to form a group of sheets, and the structure may include a group of sheets sandwiched between two outer sheets. The patterned metallic glass sheets may be patterned by thermoplastically forming two- and/or three-dimensional patterns in the metallic glass sheets. The metallic glass cellular structures are useful in a wide variety of applications, including but not limited to blast protection applications, energy absorption applications, structural support applications, biomedical implant applications, heat exchanger applications, thermal management applications, electrical shielding applications, magnetic shielding applications, and debris and radiation shielding for aerospace and outer space applications.

1 .- 29 . (canceled) 
     
     
         30 . A cellular structure comprising
 at least one first metallic glass sheet; and   at least one second sheet disposed on the at least one first metallic glass sheet such that the at least one first metallic glass sheet and the at least one second sheet form a lattice comprising a plurality of three dimensional cells, each cell having an aspect ratio defined by a height in a direction of loading divided by a thickness of the first metallic glass sheet, the aspect ratio adapted to evade buckling of the cellular structure.   
     
     
         31 . The cellular structure according to claim  1 , wherein the aspect ratio is determined by an elastic limit of the metallic glass and the geometry of the cell. 
     
     
         32 . The cellular structure according to claim  2 , wherein the elastic limit of the metallic glass is about 0.02. 
     
     
         33 . The cellular structure according to claim  1 , wherein the at least second sheet comprises at least two sheets that are at least partially flat, wherein the at least one first metallic glass is disposed between the at least two sheets. 
     
     
         34 . The cellular structure according to claim  1 , wherein the at least first sheet has a thickness of less than the plastic zone radius of the metallic glass. 
     
     
         35 . The cellular structure according to claim  1 , wherein the geometry of the lattice is configured such that the plastic collapse strength of the lattice is at least 50% of the plastic yield strength of the metallic glass. 
     
     
         36 . The cellular structure according to claim  1 , wherein the geometry of the lattice is configured such that the density of the lattice is less than 50% of the density of the metallic glass. 
     
     
         37 . The cellular structure according to claim  1 , wherein the geometry of the lattice is configured such that the specific strength of the lattice is greater than the specific strength of the metallic glass. 
     
     
         38 . The cellular structure according to claim  1 , wherein the plastic zone radius (r p ) of the metallic glass is determined by the equation: r p =K lc   2 /πσ y   2 , where K lc  is the mode 1 fracture toughness of the metallic glass, and σ y  is the plastic yield strength of the metallic glass. 
     
     
         39 . The cellular structure according to claim  1 , wherein the plastic collapse strength (σ) of the lattice is determined by the equation: σ=Aσ y (t/l) n , where σ y  is the plastic yield strength of the metallic glass, t is the thickness of the sheet, l is the width of the cell face, and where A is between 4 and 7 and n is between 1 and 3. 
     
     
         40 . The cellular structure according to claim  9 , wherein A is about 6 and n is about 2. 
     
     
         41 . The cellular structure according to claim  1 , wherein the density (ρ) of the lattice is determined by the equation: ρ=Bρ s (t/l), where ρ s  is the density of the metallic glass, t is the thickness of the sheet, l is the width of the cell face, and B is between 1 and 3. 
     
     
         42 . The cellular structure according to claim  11 , wherein B is about 2. 
     
     
         43 . The cellular structure according to claim  1 , wherein the at least one metallic glass lattice comprises a material selected from the group consisting of Fe-based alloys, Co-based alloys, Mg-based alloys, Al-based alloys, Zr-based alloys, Ti-based alloys, Au-based alloys, Pt-based alloys, Ni-based alloys, Pd-based alloys and rare earth-based alloys. 
     
     
         44 . The cellular structure according to claim  1 , wherein the at least second sheet that is at least partially flat comprises a material selected from the group consisting of polymers, epoxies, glasses, wood, ceramics, metals, metallic glasses and composites thereof. 
     
     
         45 . The cellular structure according to claim  1 , wherein the at least second sheet that is at least partially flat comprises the same metallic glass as the lattice. 
     
     
         46 . The cellular structure according to claim  1 , wherein the lattice has geometry selected froth the group consisting of honeycomb, prismatic, hexagonal, square, triangular, diamond, and nuvtrusses.