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Epitaxial Growth of Rhenium with Sputtering

What works better – DC or RF sputtering?Epitaxial superconducting films of refractory metals are a promising new template for single crystal tunnel barriers in Josephson junction quantum bit (qubit) devices. In existing Josephson junction qubits, it is believed that the widely-used amorphous AlOx tunnel barriers have undesirable two-state fluctuators. It is speculated that single-crystal tunnel barriers such as sapphire (α-Al2O3) may be free of such decoherence sources.

Posted in: Briefs, Aerospace, Defense, Materials

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Processing and Characterization of Polycrystalline YAG (Yttrium Aluminum Garnet) Core-Clad Fibers

New techniques could make polycrystalline YAG suitable for use in fiber lasers.YAG-based fiber lasers could offer efficient operation at power levels beyond those achievable in current state-of-the-art silica-based fiber lasers if losses can be minimized. To address this, researchers have investigated creating both single-crystal and polycrystalline YAG fibers. Among the cases reported is the preparation of single-crystal YAG fibers using laser heated pedestal growth (LHPG), which resulted in fiber diameters of 400 μm and optical losses around 1–2 dB/m in the 1–3 μm wavelength range. Single-crystal YAG fibers with diameters of ~ 30 μm have even been reported.

Posted in: Briefs, TSP, Aerospace, Defense, Materials

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Multi-Scale Analysis of Deformation and Failure in Polycrystalline Titanium Alloys Under High Strain Rates

Developing a crystal plasticity-based computational modeling tool for predicting performance.Extensive use of titanium alloys in critical industrial and military applications, such as compressor blades of jet engines and armor of ground combat vehicles, has motivated researchers to understand, measure and tailor the mechanical properties of these alloys over a wide range of strain rates and temperatures. Of special interest has been the mechanical response of these alloys under high rates of deformation and failure under cyclic/dwell fatigue.

Posted in: Briefs, TSP, Aerospace, Defense, Materials

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Abrasion Testing of Products Containing Nanomaterials

Ensuring repeatable results when capturing and analyzing released particles.This SOP describes how to detect and quantify the release of nanoparticles from surface coatings into the air using a mechanical process that employs abrasion to simulate sanding. A material containing nanoparticles will be physically abraded and the materials released will be collected in a custom abrasion testing system. They will then be characterized by different methods such as Scanning Electron Microscopy (SEM) or Transmission Electron Microscopy (TEM) and other methods.

Posted in: Briefs, TSP, Aerospace, Defense, Materials

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Spectrum Fatigue of 7075-T651 Aluminum Alloy Under Overloading and Underloading

Most structural members and machine components are subjected in service to cyclic loadings of varying amplitude. The variation in stress level follows either a regular or random pattern. The resulting crack growth is affected by the applied load sequence in the early stage (crack initiation) and in the later stage (crack propagation) of fatigue. The fatigue crack growth is known to be retarded by tensile overloads and accelerated by compressive overloads (underloads). However, the phenomenon and mechanism of the load sequence effects, especially those of overloading and underloading, on fatigue crack growth in different environments remain to be clarified.

Posted in: Briefs, TSP, Aerospace, Defense, Materials

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Communications Electronics Cooling Systems

Aspen Systems Marlborough, MA 508-281-5322www.apspensystems.comAspen Systems are supplying Environmental Control Units (ECU’s) for critical communications electronics cooling for the Joint Light Tactical Vehicles (JLTV) being produced by Oshkosh Corporation. The first vehicle order under this contract was released by the Army on March 23, 2016 for 657 vehicles. The initial JLTV production contract calls for a delivery total of nearly 17,000 vehicles, while the total program is expected to result in over 50,000 JLTVs delivered to the US Military.

Posted in: Application Briefs, Communications, Defense, Electronics, Thermal Management

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Advanced Simulation Technology

RGB Spectrum Alameda, CA 510-814-7000www.rgb.comThe F-35 Joint Strike Fighter is the Department of Defense's next generation strike aircraft weapon system for the Navy, Air Force, Marines, and US allies. The fifth-generation fighter brings cutting-edge technologies to the battlespace of the future. On July 31, 2015, the first squadron was declared ready for deployment after training, an important part of which was accomplished with Lockheed Martin’s high-fidelity Full Mission Simulator (FMS). RGB Spectrum’s DGy™ recording and streaming codecs and multi-channel video servers are core components in the FMS.

Posted in: Application Briefs, Defense

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