Selective Laser Melting of Tungsten-Rhenium Alloys

Additively manufactured tungsten-rhenium alloys have been compared with pure tungsten in terms of their volumetric density, cracking behavior, microstructure, and hardness. The compositions W-5 wt.%Re and W-25 wt.%Re were explored. Increasing the rhenium content led to an increasing percentage of the theoretical density, with a …

Resolving the sintering conundrum of high-rhenium tungsten …

Sintering tungsten-rhenium (W-Re) alloys becomes difficult with increasing Re content, which is revealed by the final-stage bifurcation. The pressureless two-step sintering method is carried out to resolve the sintering conundrum and produces ultrafine-grained W-Re alloys containing up to 25 wt% Re with record-fine grain sizes, uniform …

Effect of rhenium irradiations on the mechanical properties of tungsten

It is important to investigate the effect transmutation of tungsten to rhenium will have in conjunction with the displacement damage cascades caused by 14 MeV neutrons, due to the fact rhenium addition is known to cause embrittlement in neutron irradiated tungsten [6], and this could affect the life of tungsten components within a …

W-3 Re Tungsten-Rhenium Alloy MECHANICAL AND …

Rhenium, Re 25% 25% Tungsten, W 75% 75% W-26 Re Tungsten-Rhenium Alloy | MECHANICAL AND PHYSICAL PROPERTIES Metric English Physical Properties …

DIFFUSION OF TUNGSTEN AND RHENIUM TRACERS IN TUNGSTEN …

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.

Microstructure and Properties of Tungsten Rhenium …

Abstract. 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 difractometer ...

High temperature fracture experiments on tungsten–rhenium alloys

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 fracture process of tungsten – rhenium alloys at different temperatures (between room temperature and 900 °C).

Horizontal Oxidation Diffusion Behavior of MEMS-Based Tungsten-Rhenium …

Tungsten-rhenium thin film thermocouples (TFTCs) are well suited for the surface temperature monitoring of hot components due to their small size, rapid response and low cost. In this study, a tungsten-rhenium TFTC with SiC protective film on all parts except the pads was fabricated by a microelectromechanical system (MEMS) process. …

Selective Laser Melting of Tungsten-Rhenium Alloys | JOM

The laser emits a wavelength of 1080 nm with a focus diameter of approximately (50,mu hbox {m}). To minimize the amount of oxidation on our …

Neutron irradiation tolerance of potassium-doped and rhenium …

K-doped W exhibited the highest resistance (i.e. the lowest DBTT shift) to the neutron-irradiation-induced embrittlement among the materials examined in the present study. (4) The DBTT shift of K-doped W-3%Re was above 595 and 345 °C for irradiation temperatures of 600 and 1100 °C, respectively.

Surface modification and deuterium retention in rhenium doped tungsten

Surface modification and deuterium (D) retention in rhenium (Re) doped tungsten (Namely, W-5 wt.% Re) exposed to 100 eV deuterium plasma with a constant flux of 1.8 × 10 21 D/m 2 /s were investigated. All the samples were exposed to D plasma at three types of exposure conditions, namely, exposure with doses of 1.3 × 10 25 D/m 2 …

Rhenium-Tungsten Parts | Toshiba Materials

Tungsten is a strong, wear-resistant metal that is used make probe pins (contact pins) for inspecting high-density integrated circuits in parts such as semiconductors and liquid crystal panels. Toshiba Materials has developed Rheni-tung, an alloy in which rhenium is added to tungsten to further improve its properties.

Stability Evaluation and Calibration of Type C Thermocouples …

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 …

Inter-diffusion analysis of joint interface of tungsten–rhenium …

The tungsten–rhenium couple was prepared by using glow plasma physical vapor deposition (PVD) on the isotropic fine grained graphite (IG) substrates. Diffusion anneals of the tungsten–rhenium couple were conducted at the temperature from 1100 °C to 1400 °C to investigate the inter-diffusion behaviors. The results showed that …

PROPERTIES OF DILUTE TUNGSTEN-RHENIUM ALLOYS

costly, tungsten-rhenium alloys. Pugh et al. (ref. 5) have demonstrated that this is the case with fine wire of doped tungsten made by powder metallurgy techniques. In a pre-vious …

Simulation, fabrication, and characteristics of high …

In this study, a tungsten–rhenium thin-film thermocouples (TFTCs) is fabricated via magnetron sputtering on silicon carbide ceramics. Cuboid TFTCs probe is sealed with stainless steel shell to make the TFTCs probe sensor. This sensor has an average Seebeck coefficient of 27.2 µV °C−1 at 1167 °C (temperature difference). The …

Stability and mobility of rhenium and osmium in tungsten: …

We report a series of ab initio studies based upon density functional theory for the behavior of rhenium and osmium atoms in body-centered-cubic tungsten crystal. Contrary to the fast one-dimensional migration of self-interstitial atoms, interstitials of these solute elements in tungsten have three-dimensional motion because they form a mixed …

Preliminary Study of the Rhenium Addition on …

The results of structure and mechanical property investigations of tungsten heavy alloy (THA) with small additions of rhenium powder are presented. The material for the study was …

About | Tungsten Rhenium High-Temperature …

Concept Alloys is a manufacturer of Tungsten-Rhenium alloys for use in thermocouples, medical, and proprietary applications. Proprietary testing and calibration methodologies allow thermoelectric calibration of every production spool of tungsten alloy wire from 0°C to 2315°C (32°F to 4200°F). Concept also supplies, in collaboration with ...

Properties of tungsten-rhenium and tungsten-rhenium …

Historically, tungsten-25wt.% rhenium alloy has been manufactured into wire for the thermocouple market, but recent demands for high-temperature structural components have forced the development of novel processing techniques for tungsten-rhenium and tungsten-rhenium with hafnium carbide. With a melting temperature of …

Molecular dynamic simulations of displacement cascades in tungsten …

Transmutation rhenium (Re) produced in tungsten (W) neutron irradiation not only segregates and precipitates at grain boundaries (GBs) but also forms the σ-phase (WRe) in the bulk. In this study, using a molecular dynamics (MD) method, we conducted collision cascade simulations in W and W–Re alloys with 5 or 10 at% Re atoms …

Reduction, sintering and mechanical properties of rhenium-tungsten …

Fig. 3 shows the H 2-TPR profiles of raw materials of AMT and APR and the W-Re mixed precursors with different rhenium concentrations.The H 2 consumption peaks locating at ∼360 °C and 700–900 °C are assigned to the reduction of ReO 3 and WO 3, respectively.Two H 2 consumption peaks locating at 765 °C and 840 °C are supposed to …

Tungsten-Rhenium Fine Diameter Bare Thermocouple Wire

Tungsten-Rhenium thermocouple alloy combinations were developed to meet the need for measuring ultra-high temperatures in the 4200°F (2315°C) range. …

Assessment of hardening due to non-coherent …

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 ...

Tungsten–Rhenium Thermocouples Calibration in Ultra …

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 production of temperature sensors …

Tungsten-Rhenium Alloy – Material Table

Summary. Composition of Tungsten-Rhenium Alloy. Tungsten-rhenium alloys typically contains 10, 20, 30, 35, and 40% of rhenium. 75% 25% Applications of Tungsten …

Strengthening of tungsten by coherent rhenium …

Experimental data show that the accumulation of rhenium and osmium from transmutation reactions severely affect the microstructural evolution and property degradation of tungsten-based materials under neutron irradiation. Theory and modeling have confirmed that Re atom transport in W is by irradiation-produced migrating self …

Tungsten-rhenium alloy, W95Re5

Tungsten-rhenium alloy, W95Re5 1m wire, 0.1mm diameter, annealed; Synonyms: W 025100; find -GF07382437 MSDS, related peer-reviewed papers, technical documents, similar products & more at Sigma-Aldrich

Solution and diffusion of hydrogen isotopes in tungsten-rhenium …

Hydrogen solution in tungsten (W) under different temperatures and strains: a first principles calculation study. In this paper, H solution behaviors are systematically studied under varied external tensile/compressive strains in bcc W using first-principles calculations. The results show that the H solution….

Oxidation Properties of W–5% Re and W–26% Re Tungsten–Rhenium …

Tungsten–rhenium thermocouples are ideal alternatives to platinum–rhodium thermocouples for high-temperature measurement. This is attributed to the high thermal electromotive force, high melting point, rapid response, and cost efficiency of tungsten–rhenium thermocouples [1–3].ASTM International standardized a W–5% …

Molybdenum Rhenium Alloy Rod

Molybdenum Rhenium Alloy (Mo-Re Alloy) is a molybdenum-based alloy that incorporates rhenium, offering excellent ductility, weldability, formability, and strength.Mo-Re alloys find application as targets in high-speed rotating X-ray tubes, long-life grids for microwave communications, space reactor core heating tubes, high-temperature furnace heaters, …

Effect of concentration of rhenium and temperature on …

The impact of temperature on Young's modulus (E), yield stress (σe), and tensile strength (σm) differs between pure tungsten single crystals and tungsten …

Phase diagram and lattice instability in …

Tungsten has been suggested as a material in applications where it is irradiated by neutrons and undergoes trans-mutation to rhenium. Pure W has the bcc lattice structure. According to the equilibrium phase diagram about 30 at.% Re can go into a bcc W–Re solid solution. However, ab initio electronic structure calculations show that the bcc ...

TUNGSTEN 25 RHENIUM | Alloy Digest | ASM Digital Library

Abstract. Tungsten rhenium wire is used for heating elements in high-temperature furnaces and thermocouples and in electronics. Its advantage is its ability to maintain greater ductility than tungsten maintains, after exposure to extremely high temperatures. This datasheet provides information on composition, physical properties, …

Solved A tungsten/5% rhenium

Other Math. Other Math questions and answers. A tungsten/5% rhenium - tungsten/26% rhenium thermocouple has an output e.m.f. as shown in the following table when its hot (measuring) junction is at the temperatures shown. Determine the sensitivity of measurement for the thermocouple in mV/C. mV 4.37 8.74 13.11 17.48 C degrees 250.

Effect of rhenium on defects evolution behavior in tungsten …

The influence of the transmutation element rhenium (Re) on defect evolution in tungsten (W) during irradiations with heavy ions and deuterium (D) plasma was investigated. Rolled W and W–5Re alloy (Re concentration 5 wt.%) were irradiated with 500 keV iron ions to 0.06 and 0.6 dpa (displacement per atom), and deuterium plasma at 38 …