Functionally Graded Metal-Metal Composite Structures

Patent metadata

Field	Value
Publication number	US-2018093327-A1
Application number	US-201715707479-A
Country	US
Kind code	A1
Filing date	Sep 18, 2017
Priority date	Aug 23, 2013
Publication date	Apr 5, 2018
Grant date	—

Abstract

Methods and devices are disclosed for creating a multiple alloy composite structure by forming a three-dimensional arrangement of a first alloy composition in which the three-dimensional arrangement has a substantially open and continuous porosity. The three-dimensional arrangement of the first alloy composition is infused with at least a second alloy composition, where the second alloy composition comprises a shape memory alloy. The three-dimensional arrangement is consolidated into a fully dense solid structure, and the original shape of the second alloy composition is set for reversible transformation. Strain is applied to the fully dense solid structure, which is treated with heat so that the shape memory alloy composition becomes memory activated to recover the original shape. An interwoven composite of the first alloy composition and the memory-activated second alloy composition is thereby formed in the multiple alloy composite structure.

First claim

What is claimed is:

1 . A layered bi-metallic composite material, comprising:
a three-dimensional interior structure of an interwoven composite of a first alloy composition and a shape memory alloy composition; and a three-dimensional exterior structure surrounding the interior structure, wherein the exterior structure comprises solid walls of the first alloy composition, wherein the bi-metallic composite material has an overall net compressive residual stress field.

2 . The bi-metallic composite material of claim 1 , wherein the exterior structure is a box structure.

3 . The bi-metallic composite material of claim 2 , wherein the box structure is a five-sided box structure.

4 . The bi-metallic composite material of claim 3 , wherein the bi-metallic composite material is configured to be used in structural components in order to reduce propagation of surface cracks in the structural components.

5 . The bi-metallic composite material of claim 1 , wherein the first alloy composition comprises an open cell metallic cellular structure having a random design or a periodic design.

6 . The bi-metallic composite material of claim 1 , wherein the shape memory alloy composition comprises a nickel titanium alloy containing approximately equal atomic percentages of nickel and titanium.

7 . The bi-metallic composite material of claim 1 , wherein the first alloy composition comprises at least one of titanium and aluminum.

Assignees

• Nasa

Inventors

• Brice Craig A

Classifications

• B22F3/26

  Impregnating {(making ferrous alloys by impregnation C22C33/0242)} · CPC title

• B22F3/18

  by using pressure rollers · CPC title

• B22F7/02 Primary

  of composite layers {(B22F7/002 takes precedence)} · CPC title

• B22F2003/247

  Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface · CPC title

• B22F3/125

  Initially porous container · CPC title