United States of America As Represented by the Secretary of the Air Force

Ues, Inc.

The Ohio State University

Oleg N Senkov

Daniel B Miracle

Madan Mendiratta

Svetlana V Senkova

Sheldon L Semiatin

Wei Zhang

Todd M Butler

Kevin J Chaput

David Mahaffey

Yuly V Milman

Dina V Lotsko

Daniel Tung

Alexandr I Sirko

Satish I Rao

The present invention relates to Nb-based refractory alloys that are less expensive and less dense than current Nb-based refractory alloys, have better ductility than current Nb-based refractory alloys, yet which have similar or better high temperature strengths and oxidation resistance when compared to current Nb-based refractory alloys. Such Nb-based refractory alloys typically continue to be compatible with current coating systems for Nb-based refractory alloys. Such Nb-based refractory alloys are disclosed herein.

Niobium alloys for high temperature, structural applications

Systems and methods for calculating efficiency of a rotary friction welding process are described herein. An example method can include measuring kinetic energy transferred from a welding machine to an interface of a welded joint, and calculating an efficiency of a rotary friction welding process based on the measured kinetic energy. For example, a workpiece torque experienced by a sample can be measured, and an energy associated with the workpiece torque can be calculated. The efficiency of the rotary friction welding process can then be calculated using the energy associated with the workpiece torque.

Systems and methods for determining efficiency of friction welding processes

The present invention provides a high strength aluminum alloy composition and applications of the high strength aluminum alloy composition. The alloy composition exhibits high tensile strength at ambient temperatures and cryogenic temperatures. The alloy composition can exhibit high tensile strength while maintaining a high elongation in ambient temperatures and cryogenic temperatures.

High strength aluminum alloy composition

The present invention provides a method of making a high strength aluminum alloy composition. The alloy composition exhibits high tensile strength at ambient temperatures and cryogenic temperatures. The alloy composition can exhibit high tensile strength while maintaining a high elongation in ambient temperatures and cryogenic temperatures.

Method of making a high strength aluminum alloy composition

A method for selecting alloying elements for complex, multi-component amorphous metal alloys is provided in which the solvent element is the largest atom with a concentration of 40-80 at %, the second most concentrated element has a radius of 65-83 % the radius of the solvent atom and a concentration of 10-40 at % in the alloy, with other elements selected at lower concentrations. For ternary alloys specified by this invention, the third element must have an atomic radius within 70-92 % of the solvent atom radius. In the preferred embodiment, alloys with four or more elements are specified, where the third elements must have an atomic radius within 70-80 %, the fourth element must have an atomic radius within 80-92 % of the solvent atom radius, and all other solute elements must have atomic radii within 70-92 % of the solvent atom radius. The concentrations of elements that have radii that differ by less than 1 % from one another are added together and treated as a single alloy addition for the purpose of this invention.

Method of selection of alloy compositions for bulk metallic glasses

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Fairborn, OH, United States of America

Oleg N Senkov