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Method for preparing ultrafine-grained metallic foil

a technology of metallic foil and ultrafine grain, applied in the field of metal foil, can solve the problems of metal and alloy strength and decrease of ductility

Inactive Publication Date: 2005-06-16
LOS ALAMOS NATIONAL SECURITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plastic deformation by rolling, extrusion, drawing, and other conventional techniques often increase the strength of metals and alloys, but decrease their ductility [6-9].

Method used

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  • Method for preparing ultrafine-grained metallic foil
  • Method for preparing ultrafine-grained metallic foil
  • Method for preparing ultrafine-grained metallic foil

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Embodiment Construction

[0023] The invention includes a method for preparing ultrafine-grained (UFG), high strength metallic foil. The method was demonstrated by converting an ultrafine-grained titanium billet into ultrafine-grained titanium foil.

[0024] Coarse-grained Ti and UFG Ti were used as the initial material stocks; both are commercially pure Ti, and include certain minor amounts of impurities such as oxygen (0.2 weight percent), hydrogen (0.002 weight percent), nitrogen (0.04 weight percent), carbon (0.07 weight percent), iron (0.1 weight percent iron), silicon (0.01 weight percent), and aluminum (0.28 weight percent).

[0025] Reference will now be made in detail to the present preferred embodiments of the invention. The grain size and structure of a coarse-grained titanium billet was refined to an ultrafine-grain size by subjecting the coarse-grained billet to repeated extrusion through a warm Equal Channel Angular Extrusion (ECAE) die followed by cold rolling and annealing. The workpiece billet w...

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Abstract

Coarse-grained titanium and ultrafine-grained (UFG) titanium billets were processed into titanium foil cold rolling and intermediate annealing. The foil produced from the UFG titanium billet exhibits a homogeneous nanostructure. By contrast, foil produced by cold rolling the coarse-grained titanium billet exhibits a heterogeneous structure with both nanostructured and coarser-grained regions. The foil produced from UFG billets has higher strength, higher ductility, and exhibits uniform deformation over a larger strain range at room temperature than foil produced from coarse-grained billets.

Description

STATEMENT REGARDING FEDERAL RIGHTS [0001] This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy. The government has certain rights in the invention.FIELD OF THE INVENTION [0002] The present invention relates generally to metallic foil and more particularly to a method for preparing ultrafine-grained metallic foil. BACKGROUND OF THE INVENTION [0003] Extremely high rolling strain (reduction in thickness) is needed to produce thin metal foil from much thicker, precursor sheet stock. A reduction in thickness of, for example, 98% is required in order to produce 20-micrometer (μm) thick metal foil from 1 millimeter-thick metal sheet stock. Work hardening prevents a metal sheet stock workpiece from being cold rolled to such a high strain without intermediate annealing. Metals and alloys with high ductility are desirable because they can be cold rolled to a high plastic strain before intermediate annealing becomes necessary...

Claims

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Application Information

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IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor ZHU, YUNTIAN T.VALIEV, RUSLAN Z.STOLYAROV, VLADIMIR V.KOLOBOV, YURI R.GRABOVETSKAYA, GALINA P.GIRSOVA, NATALIA V.
Owner LOS ALAMOS NATIONAL SECURITY
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