Materials
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Briefs Electronics & Computers
High-Cycle Life Testing of RF MEMS Switches
The electromechanical, RF, and charging properties of an "air-gap" capacitive switch enable it to be utilized in high-cycle life testing. Monitoring both high-speed and low-speed switching...
Briefs Materials
Composites Containing Nanostructured Shape-Memory Alloys
A continuing program of research is devoted to understanding composite materials that include nanostructured shape-memory alloy (SMA) constituents and to developing methods of fabricating components from such materials. This research is intended to improve the utilization of SMAs in...
Briefs Physical Sciences
Some Advances in Understanding of Environmental Fatigue
A research program has yielded advances in understanding of numerous aspects of environmental crack propagation in aerospace aluminum alloys. From one perspective, the objective of this program was to quantitatively establish governing crack-tip-mechanics conditions and damage mechanisms...
Briefs Electronics & Computers
Microscale Electrical Contacts for Self-Assembly
An experimental study of self-assembly processes in which small, heterogeneous components become spontaneously aligned with each other and bonded through soldering of mating electrical contacts...
Briefs Physical Sciences
Microcompression Tests of a BMG and a Tungsten/BMG Composite
Uniaxial-compression tests of micron-scale specimens (microcompression tests) of a bulk metallic glass (BMG) and of a tungsten/BMG composite have been performed to contribute to...
Briefs Manufacturing & Prototyping
Inexpensive Free-Form Fabrication of Titanium-Alloy Parts
A continuing effort to devise relatively inexpensive means of manufacturing titanium-alloy parts has been focused on a free-form fabrication approach. As used here, “free-form...
Briefs Manufacturing & Prototyping
Experiments in Vacuum Brazing of Titanium
An experimental study of vacuum brazing of titanium and of the effects of changes in brazing alloys and brazing process conditions has been performed. [As used here, “titanium” signifies both...
Briefs Materials
Alloys for Nozzles of Hypersonic Wind Tunnels
Alloys are being developed for nozzles of hypersonic wind tunnels to be used in testing components of future hypersonic missiles, aircraft, and space transportation systems. The nozzle components...
Briefs Test & Measurement
Multiscale Virtual Design and Testing of Materials
Progress has been made in research on several fronts in an effort to develop computational simulation capabilities for use in virtual design and testing of advanced structural materials. It is...
Briefs Electronics & Computers
Improved Magnetic Sensor Based on Giant Magneto-Impedance
A low-power, highly stable electronic sensor circuit for measuring a small change in the ambient magnetic field with high sensitivity exploits the giant magneto-impedance (GMI) effect,...
Briefs Materials
Accelerated Evaluation of Properties of Polyphase Alloys
A methodology for accelerated evaluation of mechanical properties of polyphase alloys is based on digital representations of the alloys. For a given alloy material system, this...
Briefs Materials
Friction Stir Welding of Aerospace Materials
AFRL scientists are studying a unique metal joining process— friction stir welding (FSW)—for building major structural assemblies. FSW is a solid-state welding process that forces a spinning tool...
Briefs Materials
Textile Capacitor
The Air Force (AF) is evolving from a Cold War-era force with a large, containment- focused infrastructure to a smaller, more responsive and affordable Air and Space Expeditionary Force. In support of this transformation, AFRL...
Briefs Materials
Strain-Induced Porosity Model
AFRL scientists developed advanced computer models to improve the processing and quality of titanium alloys used in manufacturing gas turbine engine parts and critical structural components for military aircraft....
Briefs Materials
Super-High-Strength Aluminum Alloy
AFRL researchers developed a super-high-strength aluminum alloy that engineers can use to improve the capability and performance of aerospace components—cryogenic rocket engine components, in particular....
Briefs Materials
Characterizing Mechanical Properties at the Microscale
Scientists from AFRL, Pratt & Whitney Aircraft, and General Electric Aircraft Engines, working under the Defense Advanced Research Projects Agency's Accelerated Insertion of Materials...
Briefs Materials
Predicting the Composition of Metallic Glasses
AFRL scientists made significant progress in developing bulk metallic glasses to improve the durability and performance of aerospace components. They also successfully created working scientific...
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