Our discovery of the solution softening-to-hardening transition, including its dislocation mechanism, clarifies the intrinsic effect of Re on the toughness of recrystallized W alloy, providing essential knowledge for the compositional design of refractory alloys in general.Web
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Samples of ultra-high-purity tungsten prepared using chemical vapour deposition (CVD) technique were irradiated with neutrons at temperatures T irr = 373–483 K (stage II of defect recovery) and T irr = 573–673 K (stage III) up to 0.15 displacements per atom (dpa) in the Belgian reactor (BR2). The study of the microstructure of neutron …Web
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1.1 Rhenium-186. 186 Re can be obtained in a nuclear reactor by irradiating stable rhenium-185 (185 Re) isotopes with thermal neutrons. However, the reaction cross section is relatively low, 112 b. Using the (n, γ)-reaction, the product can be obtained only with a relatively low specific activity that is insufficient for targeted …Web
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Rhenium is a refractory metal with potential uses in nuclear reactor applications, particularly those at very high temperatures. Measurements have been made using natural samples. Natural rhenium consists of two isotopes: 185 Re (37.40%) and 187 Re (62.60%). The electron linear accelerator (LINAC) at the Rensselaer Polytechnic …Web
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Tungsten‐rhenium thermocouple systems were evaluated for use in measuring temperatures between 1600 and 3000°C. Temperature‐millivolt relationships were extended from 2300 to 3000°C for bare‐wire W3Re/W25Re and W5Re/W26Re thermocouples in vacuum. The performance of W26Re sheathed, high‐fired beryllia‐insulated …Web
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Procedure. Nano-tungsten rods produced via powder metallurgy at ARL and containing 0%, 5%, and 10% rhenium were selected for Gleeble experimentation. Cylindrical samples were machined from the rods using wire electrical discharge machining (EDM); the test samples had a diameter of. 7 mm and a length of 7 mm.Web
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In this work, we systematically investigate the mechanical properties of tungsten-rhenium (W-Re) alloys using molecular dynamics simulations.Web
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Rhenium has an extremely high melting point (3180 °C), only lower than carbon (3500 °C) and tungsten (3422 °C) of all the elements. Rhenium has a heat-stable crystalline structure and excellent ductility from freezing to very high temperatures, making it exceptionally resistant to heat and wear (Millensifer et al., 2014, John et al., 2017).Web
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A gadolinium (Gd) shielding was used to absorb the thermal neutrons and reduce rhenium and osmium generation in tungsten. Pure tungsten and K-doped W-3% Re samples were irradiated at 532 – 662 °C to dose of 0.21-0.46 dpa, with the grain orientation perpendicular or parallel to the disk surface.Web
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The Japan-US PHENIX project irradiated tungsten materials in the RB-19J capsule experiment in the High Flux Isotope Reactor (HFIR). A gadolinium (Gd) shielding was used to absorb the thermal neutrons and reduce rhenium and osmium generation in tungsten. Pure tungsten and K-doped W-3% Re samples were irradiated at 532 – 662 …Web
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There are presented results of experimental research on calibration of tungsten–rhenium thermocouples at the temperatures exceeding the upper limit of measurements (1700 °C) of standard type B thermocouple. The research was carried out using the high-temperature installation UKT-2500 designed for practical use in …Web
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Element Rhenium (Re), Group 7, Atomic Number 75, d-block, Mass 186.207. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Jump to main content . ... Rhenium is used as an additive to tungsten- and molybdenum-based alloys to give useful properties. These alloys are used for oven filaments and x-ray machines.Web
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Abstract A series of tungsten—rhenium solid solution alloys have been examined using a helium field-ion microscope. The micrographs show that during field evaporation of these …Web
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Tungsten alloy with addition of rhenium and tantalum was prepared by laser sintering. Microstructure and properties of the samples were tested by optical microscope, X-ray diffractometer and ...Web
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Tungsten-rhenium (W-10Re) powder was successfully prepared by wet chemistry method followed by spark plasma sintering technique to fabricate W-10Re alloy. The synthesis mechanism and reduction behavior of the W-10Re powders were investigated by using X-ray diffraction (XRD), thermogravimetric experiments, and X-ray …Web
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A tungsten-rhenium alloy (90%:10% mix) forms the basis for the target in modern x-ray tubes, rhenium improves the durability of the target 4. tungsten is used as a shielding material for FDG by the radiopharmaceutical industry, although it has a lower atomic number than lead it mitigates this with a higher density 5.Web
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Frank analysed the use of tungsten-rhenium alloy as suture needle for CABG surgery and reported that it intensifies the properties than conventionally available stainless steel suture needles [7]. Asamoto reviewed tungsten-rhenium as thermo couples for measuring high temperatures [8]. Superconducting transition temperatures of chemical …Web
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Tungsten-Rhenium (W-Re) thin films were grown on alumina ceramic substrate using the magnetron sputtering technique. The feasibility and reliability of the tungsten-rhenium thin film thermocouples ...Web
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Rhenium is very expensive but has been shown to markedly improve strength and creep resistance at extreme temperatures. 15 Additive manufacturing (AM) is an …Web
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The effect of temperature and concentration of Rhenium (Re) on the mechanical behaviors of tungsten (W) are discussed. To show the impact of these …Web
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Abstract In this article, using the known experimental values of the wetting angles, the surface energies of tungsten and rhenium in the solid state, and the surface energy of liquid tin, the interfacial energies of solid refractory metals at the interface with liquid tin are calculated as functions of temperature. It is shown that taking into account …Web
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Numerous rhenium complexes using a combination of organometallic ligands have been tested. Examples of cancers for which rhenium compounds are investigated are liver, lung, breast and prostate cancer among others. One promising application is the use of rhenium compounds for bone metastases . Rhenium alloys Tungsten–rhenium alloysWeb
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A big problem when using tungsten as plasma facing components in a future fusion reactor is the very low fracture toughness at low temperatures. Tungsten – rhenium alloys outclasses other tungsten-based materials in terms of increased ductility. We study the reason for this positive effect by investigating the influence of rhenium on the …Web
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A gadolinium (Gd) shielding was used to absorb the thermal neutrons and reduce rhenium and osmium generation in tungsten. Pure tungsten and K-doped W-3% Re samples were irradiated at 532 – 662 °C to dose of 0.21-0.46 dpa, with the grain orientation perpendicular or parallel to the disk surface.Web
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Tungsten has the highest melting point of all the metallic elements and a density comparable to that or uranium or gold and about 1.7 times that of …Web
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Type C: Tungsten 5% Rhenium (+) vs. Tungsten 26% Rhenium (-) Type D: Tungsten 3% Rhenium (+) vs. Tungsten 25% Rhenium (-) In order to guarantee the limits of error, OMEGA sells Tungsten-Rhenium thermocouple wire only in matched pairs by the double foot. Because of the inherent brittleness of unalloyed Tungsten, Rhenium has …Web
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Rhenium is a refractory metal and is one of the rarest elements. Due to its high cost, recycling of rhenium-containing scraps is of economic interest. This paper pertains to the recycling of rhenium from tungsten–rhenium wire scrap generated in the manufacturing of W 97 Re 3 wire. Rhenium from wire scrap, which contained 3.1–3.4% …Web
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The solubility of tungsten in rhenium at the temperature of 2800 °C is 20%, and at the temperature of 1500 °C it is 12%. Rhenium solubility in nickel at 1620 °C is 17.4%. It should be emphasized that the attached system displays equilibrium with the W-Re phase above the temperature of 1500 °C.Web
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The toughening of tungsten by alloying with another metal has been widely studied in powder metallurgy. The main alloy compositions include tungsten tantalum [39,40,41], tungsten vanadium [42, 43], tungsten rhenium [44,45,46], and tungsten niobium . However, due to the high melting point and low diffusivity of tungsten, the …Web
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2.1 Tungsten–Rhenium Thermocouples. The chemical and physical properties of tungsten and rhenium, such as embrittlement of tungsten at high temperature, high vapor pressure of rhenium, and easy oxidation of tungsten–rhenium alloy, limit their use in certain applications [].Stability evaluation and calibration were …Web
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A thermal stress range analysis of tungsten-rhenium thin film thermocouples based on ceramic substrates is presented to analyze the falling off and breakage problems caused by the mismatch of the ...Web
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Rhenium is the only known effective alloying element to improve the ductility of tungsten. • No evidence has yet shown reducing grain size alone can improve the …Web
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Most alloying additions, with the exception of rhenium, tend to reduce tungsten's already poor ductility [10]. Traditional metallurgical techniques for tungsten and tungsten alloys are commonly carried out under a hydrogen atmosphere in order to suppress oxidation and reduce the oxygen concentration in the final material.Web
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B B15-17 Type C source B 17 Tungsten–5% rhenium / Hafnia > 98% pure Molybdenum 99.9% pure tungsten–26% rhenium (ASTM E988) C C15-18 Type C source C 18 Tungsten–5% rhenium/ Hafnia 99.95% pure Molybdenum 99.95% pure C15-19 Type C source C 19 tungsten–26% C15-20 Type C source C 20 rhenium (ASTM E988) Figure 4.Web
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In fusion applications, tungsten (W) based alloys are known to harden and embrittle as a result of irradiation-assisted transmutation to rhenium (Re) and its subsequent precipitation into non ...Web
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Scope. 1.1 This standard consists of reference tables that give temperature-electromotive force (emf) relationships for 97% Tungsten 3% Rhenium versus 75% Tungsten 25% Rhenium and 95% Tungsten 5% Rhenium versus 74% Tungsten 26% Rhenium thermocouples. These are the refractory metal thermocouple types most …Web
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A study was made of the mechanical properties of vacuum arc-melted tungsten and tungsten-rhenium alloys in the temperature range 77O to 810' K. The ductile-brittle transition temperature of the unalloyed recrystallized tungsten prepared for this study was 490' K and was reduced to 430' and 350' K by additions of 2 and 25 percent rheniumWeb
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Nemoto et al. Citation 49 published work in 2000 on tungsten–rhenium irradiated in the Fast Flux Test Facility (FFTF), USA, at temperatures between 646 and 1073 K and damage levels between 2 and 11 dpa. Using TEM dark field imaging they show the presence and morphology of ...Web
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Selective dissolution of a tungsten (85 wt.%)–rhenium (15 wt.%) alloy with rhenium in hydrochloric acid at the temperature of 298 K and anodic polarization modes was carried out to develop a porous catalytic substrate and to recycle rare metals. The parameters of the effective selective anodic dissolution of the tungsten–rhenium alloy, …Web
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A tungsten-rhenium (W-Re) classical interatomic potential is developed within the embedded atom method (EAM) interaction framework. A force-matching method is employed to fit the potential to ab initio forces, energies, and stresses. Simulated annealing is combined with the conjugate gradient technique to search for an optimum potential …Web
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