US Government As Represented by the Secretary of the Army

Johns Hopkins University

Matsys Inc.

United States Army Research Laboratory

Laszlo John Kecskes

Kristopher Allen Darling

Anthony James Roberts

Micah J Gallagher

Brady G Butler

Brian T Edwards

Robert H Woodman

Kiran N Solanki

Tony F Zahrah

Heather Ann Murdoch

Roderick Rowland

Billy C Hornbuckle

Todd Hufnagel

Scott Martin Grendahl

Thomas Lee Luckenbaugh

Mansa Rajagopalan

Rajiv S Mishra

Yuri Mishin

Lee S Magness, Jr

Ryan T Ott

Cang Fan

Novel metallic systems and methods for their fabrication provide high temperature machine parts formed of a consolidated nano-crystalline metallic material. The material comprises a matrix formed of a solvent metal having a melting point greater than 1,250&#xb0; C. with crystalline grains having diameters of no more than about 500 nm, and a plurality of dispersed metallic particles formed on the basis of a solute metal in the solvent metal matrix and having diameters of no more than about 200 nm. The particle density along the grain boundary of the matrix is as high as about 2 nmof grain boundary area per particle so as to substantially block grain boundary motion and rotation and limit creep at temperatures above 35% of the melting point of the consolidated nano-crystalline metallic material. The machine parts formed may include turbine blades, gears, hypersonics, radiation shielding, and other high temperature parts.

Nanocrystalline high temperature machine parts

Novel metallic systems and methods for their fabrication provide an extreme creep-resistant nano-crystalline metallic material. The material comprises a matrix formed of a solvent metal with crystalline grains having diameters of no more than about 500 nm, and a plurality of dispersed metallic particles formed on the basis of a solute metal in the solvent metal matrix and having diameters of no more than about 200 nm. The particle density along the grain boundary of the matrix is as high as about 2 nmof grain boundary area per particle so as to substantially block grain boundary motion and rotation and limit creep at temperatures above 35% of the melting point of the material.

Extreme creep resistant nano-crystalline metallic materials

High-density thermodynamically stable nanostructured copper-based metallic systems, and methods of making, are presented herein. A ternary high-density thermodynamically stable nanostructured copper-based metallic system includes: a solvent of copper (Cu) metal; that comprises 50 to 95 atomic percent (at. %) of the metallic system; a first solute metal dispersed in the solvent that comprises 0.01 to 50 at. % of the metallic system; and a second solute metal dispersed in the solvent that comprises 0.01 to 50 at. % of the metallic system. The internal grain size of the solvent is suppressed to no more than 250 nm at 98% of the melting point temperature of the solvent and the solute metals remain uniformly dispersed in the solvent at that temperature. Processes for forming these metallic systems include: subjecting powder metals to a high-energy milling process, and consolidating the resultant powder metal subjected to the milling to form a bulk material.

High-density thermodynamically stable nanostructured copper-based bulk metallic systems, and methods of making the same

The invention is an apparatus and method for safely depressurizing milling vials. The invention utilizes a machinist vise in communication with a pneumatic air cylinder mounted in a jig inside glove box enclosure. The invention utilizes a method for safely depressurizing milling vials. The milling vials are placed into the machinist vise inside the enclosure. The ram of the pneumatic air cylinder is placed on top of the milling vial and the pneumatic air cylinder is pressed firmly against the cap of the milling vial. Next, the air inside the enclosure is evacuated of atmosphere after which the pressure is slowly released from the pneumatic air cylinder. During this stage of the method the operator is a safe distance from the enclosure. As pressure is removed from the pneumatic air cylinder the ram is retracted and the cap of milling vial is removed.

Apparatus and method for safely depressurizing milling vials

A binary or higher order high-density thermodynamically stable nanostructured copper-tantalum based metallic system according to embodiments of the invention may be formed of: a solvent of copper (Cu) metal that comprises 70 to 100 atomic percent (at. %) of the metallic system; and a solute of tantalum (Ta) metal dispersed in the solvent metal, that comprises 0.01 to 15 at. % of the metallic system. The metallic system is thermally stable, with the absence of substantial gross grain growth, such that the internal grain size of the solvent metal is substantially suppressed to no more than about 250 nm at approximately 98% of the melting point temperature of the solvent metal and the solute metal remains substantially uniformly dispersed in the solvent metal at that temperature. Processes for forming these metallic systems may include: subjecting powder metals of solvent and the solute to a high-energy milling process using a high-energy milling device to impart high impact energies to its contents. Due to their high-density thermodynamically stable nanostructured, these metallic systems are an ideal candidate for fabricating shaped charge liners for ordinance.

Binary or higher order high-density thermodynamically stable nanostructured copper-based tantalum metallic systems, and methods of making the same

A class of high-density bulk metallic glass hafnium-based alloys, having copper, nickel, aluminum, tin, and titanium or niobium as alloying elements is disclosed. This class includes alloys having higher densities and a higher reduced glass-transition temperature than other known refractory metallic glass alloys.

High-density hafnium-based metallic glass alloys that include six or more elements

A class of high-density bulk metallic glass hafnium alloys, having copper, nickel, aluminum and titanium or niobium as alloying elements is disclosed. This class includes alloys having higher densities and a higher reduced glass-transition temperature than other known metallic glass alloys.

High-density metallic glass alloys

The invention includes a method for producing high-density composites of metallic glass alloy powders in combination with a refractory metal powder, and includes related methods for producing metallic glass alloys. The invention, in one aspect, employs a system of monitoring the temperature and hot isostatic pressing conditions during the consolidation of metallic compositions in order to produce higher densities and materials of a larger diameter, for example. In another aspect, the invention involves method whereby a third interfacial phase at a metallic glass alloy/refractory metal interface is effectively controlled to produce composites with advantageous properties.

High-density metallic-glass-alloys, their composite derivatives and methods for making the same

The present invention provides a ballistic testing recovery apparatus and method for allowing post impact analysis of pyrophoric projectile debris wherein the apparatus comprises a containment chamber having an interior volume filled with a solvent-soluble granulated material. The containment chamber is formed with an aperture in a side wall for receiving a launched projectile therethrough. The projectile impacts a target plate disposed in the containment box and projectile debris is thereafter ejected into the surrounding solvent-soluble granulated material. The solvent-soluble granulated material operates to capture and quench the projectile debris before devitrification and/or crystallization erodes the 'as-ejected' characteristics of the pyrophoric projectile debris.

Recovery apparatus for fragmented ballistic materials and method for collection of the same

In accordance with a preferred embodiment of the invention, an alloy or other composite material is provided formed of a bulk metallic glass matrix with a microstructure of crystalline metal particles. The alloy preferably has a composition of (XNiCu)YAl, wherein the sum of a, b and c equals 100, wherein 40&#x2266;a&#x2266;80, 0&#x2266;b&#x2266;35, 0&#x2266;c&#x2266;40, 4&#x2266;d&#x2266;30, and 0&#x2266;e&#x2266;20, and wherein preferably X is composed of an early transition metal and preferably Y is composed of a refractory body-centered cubic early transition metal. A preferred embodiment of the invention also provides a method of producing an alloy composed of two or more phases at ambient temperature. The method includes the steps of providing a metastable crystalline phase composed of at least two elements, heating the metastable crystalline phase together with at least one additional element to form a liquid, casting the liquid, and cooling the liquid to form the alloy. In accordance with a preferred embodiment of the invention, the composition and cooling rate of the liquid can be controlled to determine the volume fraction of the crystalline phase and determine the size of the crystalline particles, respectively.

Alloy and method of producing the same

A method and apparatus for fabricating high density monolithic metal and oy billets. The process requires preheating precursor materials of metal or alloy billets by means of a combustion synthesis called Self-Propagating High-Temperature Synthesis (SHS). The reaction takes place in an insulated reaction vessel where the precursors, in a powder form, are heated to high temperatures. The precursors are then compacted to high density by means of pressure waves generated by detonation of an explosive. The method is capable of producing high purity tungsten and tungsten-based alloys of greater than 90% theoretical density.

Hot explosive consolidation of refractory metal and alloys

A method and apparatus for fabricating high density monolithic metal and alloy billets. The process requires preheating precursor materials of metal or alloy billets by means of a combustion synthesis called Self-Propagating High-Temperature Synthesis (SHS). The reaction takes place in an insulated reaction vessel where the precursors, in a powder form, are heated to high temperatures. The precursors are then compacted to high density by means of pressure waves generated by detonation of an explosive. The method is capable of producing high purity tungsten and tungsten-based alloys of greater than 90% theoretical density.

Growing community of inventors

Havre de Grace, MD, United States of America

Laszlo John Kecskes