High performance nanostructured materials and methods of making the same
First Claim
1. A nanostructured material having a tensile yield strength from at least about 1.5 to about 2.3 GPa and a ductility of from at least about 1 to about 18 percent strain-to-failure.
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Abstract
Preferred embodiments of the invention provide new nanostructured materials and methods for preparing nanostructured materials having increased tensile strength and ductility, increased hardness, and very fine grain sizes making such materials useful for a variety of applications such as rotors, electric generators, magnetic bearings, aerospace and many other structural and nonstructural applications. The preferred nanostructured materials have a tensile yield strength from at least about 1.9 to about 2.3 GPa and a tensile ductility from at least 1%. Preferred embodiments of the invention also provide a method of making a nanostructured material comprising melting a metallic material, solidifying the material, deforming the material, forming a plurality of dislocation cell structures, annealing the deformed material at a temperature from about 0.30 to about 0.70 of its absolute melting temperature, and cooling the material.
20 Citations
19 Claims
- 1. A nanostructured material having a tensile yield strength from at least about 1.5 to about 2.3 GPa and a ductility of from at least about 1 to about 18 percent strain-to-failure.
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4. A nanostructured material having a tensile elastic yield strain of at least about 1% for the material and a ductility from at least about 1 to about 18 percent plastic strain-to-failure.
- 7. A method of making a nanostructured material comprising melting a metallic material into a liquid state, solidifying the material, deforming said metallic material wherein a plurality of dislocation cell structures are formed, annealing said metallic material at a temperature from about 0.3 to about 0.7 of its absolute melting temperature, and cooling said metallic material to produce nanostructured material having a tensile elastic yield strain of at least about 1% for the material and a ductility from about 1 to about 18 percent plastic strain-to-failure.
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11. A method of adjusting the tensile strength of a nanostructured material comprising:
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melting a metallic material into a liquid state;
solidifying said material;
deforming said metallic material wherein a plurality of dislocation cell structures are formed;
annealing said metallic material at a temperature from about 0.30 to 0.70 of its absolute melting temperature for a time from about 1000 hours to several seconds, wherein the temperature and time are selected to achieve a tensile elastic yield strain of at least about 1% for the material for said the nanostructured material; and
cooling said metallic material. - View Dependent Claims (14, 15, 16, 18, 19)
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12. A method of adjusting the ductility of a nanostructured crystalline material comprising the steps of:
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melting a metallic material into a liquid state;
solidifying said material;
deforming said metallic material so that a plurality of dislocation cell structures are formed;
annealing said metallic material at a temperature from about 0.37 to 0.53 of its absolute melting temperature for a period of time from 50 hours to several minutes, wherein the temperature and time are selected to achieve a ductility from at least about 1% percent to about 18 percent plastic strain-to-failure; and
cooling said metallic material after said annealing step.
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13. A method of adjusting the ductility of a nanostructured crystalline material comprising the steps of:
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melting a metallic material into a liquid state;
solidifying said material;
deforming said metallic material so that a plurality of dislocation cell structures are formed;
annealing said metallic material at a temperature from about 0.39 to about 0.44 of its absolute melting temperature for a period of time from about 20 hours to about 1 hour, wherein the temperature and time are selected to achieve a ductility from at least about 1 % to about 18 percent plastic strain-to-failure; and
cooling said metallic material after said annealing step.
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17. Nanostructured magnetic materials, wherein the materials are cold-rolled and annealed at a temperature ranging from about 350 to about 705 degrees Celsius, have a room temperature yield strength from 1.2 GPa to more than 2.3 GPa, and tensile ductility from 1% to more than 18% plastic strain-to-failure.
Specification