Abstract. Rhenium diboride (ReB 2) exhibits high differential strain due to its puckered boron sheets that impede shear deformation.Here, we demonstrate the use of solid solution formation to enhance the Vickers hardness and differential strain of ReB 2.ReB 2-structured solid solutions (Re 0.98 Os 0.02 B 2 and Re 0.98 Ru 0.02 B 2, noted …
Super-tough material mimics metal and crystal. By Mason Inman. 19 April 2007. Ingots of rhenium diboride are formed by heating and mixing rhenium and boron. (Image: Richard B. Kaner/Jonathan B ...
The pressure-induced phase transition and mechanical properties of rhenium diboride (ReB 2) have been investigated by using the particle swarm optimization algorithm in combination with density functional theory calculations.It was found that the P6 3 /mmc structure of ReB 2 (hP6-ReB 2) is the most stable phase at ambient conditions, and it will …
Chromium diboride is used to apply coatings enduring abrasive and sliding (metal-on-metal) wear. Zirconium diboride is applied as a component in ultrahigh temperature ZrB 2 –SiC ceramics for making immersion lances used in steel refining and resists the action of a lot of molten metals and alloys. This allows using zirconium …
We report that rhenium diboride (ReB2), synthesized in bulk quantities via arc-melting under ambient pressure, rivals materials produced with high-pressure …
The unit-cell volume of rhenium diboride (ReB{sub 2}) has been measured by synchrotron X-ray diffraction at pressures and temperatures of up to 7.5 GPa and 1100 K with a cubic anvil apparatus. From the pressure (P)-volume (V)-temperature (T) measurements, thermoelastic parameters were derived for ReB2 based on a modified …
The superhard ReB 2 system is the hardest pure phase diboride synthesized to date. Previously, we have demonstrated the synthesis of nano-ReB 2 and the use of this nanostructured material for texture analysis using high-pressure radial diffraction. Here, we investigate the size dependence of hardness in the nano-ReB 2 system using …
Rhenium Diboride Powder. Rhenium diboride (ReB2) is a synthetic superhard material. It was first synthesized in 1962, and re-emerged recently due to hopes of achieving high hardness comparable to that of the diamond. However, the ultrahigh hardness has not been confirmed. The production method of this material does not involve high pressures as ...
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Exploring the hardness and high-pressure behavior of osmium and ruthenium-doped rhenium diboride solid solutions | Exploring the hardness and high-pressure behavior of osmium and ruthenium-doped rhenium diboride solid solutions – APL Mater. .
Properties . Two factors contribute to ReB 2 's great hardness: a high density of valence electrons and an abundance of short covalent bonds. Rhenium has one of the highest valence electron densities of any transition metal (0.476 electrons/Å 3, compare to 0.572 electrons/Å 3 for osmium and 0.705 electrons/Å 3 for diamond).The addition of boron …
Rhenium diboride (ReB2) in its crystalline structure, is widely known as a super-hard material, and has been studied many times using the Density Functional Theory (DFT) approach. In this work the ...
Rhenium diboride (ReB 2) exhibits high differential strain due to its puckered boron sheets that impede shear deformation. Here, we demonstrate the use of …
Without doubts, rhenium diboride, ReB 2 (P 6 3 /mmc, a = 2.9 ˚ A and c = 7.478Å478˚478Å), is one of the most studied transition metal borides due to its hardness and incompressibility.
Rhenium diboride is an established superhard compound that can scratch diamond and can be readily synthesized under ambient …
We report that rhenium diboride (ReB 2), synthesized in bulk quantities via arc-melting under ambient pressure, rivals materials produced with high-pressure …
The mechanical and electronic properties of hcp-Re B 2 are calculated by a first-principles approach.The calculated extreme equilibrium mechanical properties are consistent with the available experimental and theoretical data.
Recently, the superhardness of rhenium diboride was discovered. This study presents a first successful preparation and characterization of thin ReB2 films. The films were deposited by the pulsed laser deposition (PLD) technique. The morphology, microstructure, and hardness of the films were investigated. The films are compact and continuous, with …
Rhenium diboride is an established superhard compound that can scratch diamond and can be readily synthesized under ambient pressure. Here, we demonstrate two synergistic ways to further enhance the already high yield strength of ReB 2.The first approach builds on previous reports where tungsten is doped into ReB 2 at …
Science. 2007. TLDR. The synthesis of superhard rhenium diboride (ReB2) at ambient pressure is shown to be not a superhard material, and the prospect for large-scale industrial applications of ReB2 doubtful.
Testing the Limits of Superhard Rhenium/Tungsten Diboride. February 27, 2017. For the past few years, transition-metal borides have attracted a great deal of attention due to their outstanding physical …
Abstract. The simultaneous synthesis and densification of rhenium diboride is investigated starting from Re and B as reactants by using the Spark Plasma Sintering (SPS) apparatus. It is shown that SPS represents an effective technique to synthesize ReB 2 bulk samples with high purity and density.
Using first-principles calculations, the elastic constants, thermodynamic property and structural phase transition of rhenium diboride under pressure are investigated by means of the pseudopotential plane-waves method, as well as the effect of metallic bond on its hardness.
Abstract. Using first-principles calculations, the elastic constants, thermodynamic property and structural phase transition of rhenium diboride under …
The average measured Hv for polycrystalline ReB 2 and Ti–B composites under different loads shows that the tendency of Hv to decrease becomes weak for large loads, and the measured hardness of ReB 2 is always lower than that of Ti–B composites. For comparison, the results from Chung et al. were inserted into the figure.
recently reported the synthesis of superhard rhenium diboride (ReB 2) at ambient pressure. They reported a very high hardness value of 48 GPa and suggested …
Shear strength measurements have been carried out on rhenium diboride, ReB2, to a pressure of 74 GPa using a Radial X-ray Diffraction (R-XRD) technique in a …
The mechanical and electronic properties of hcp-ReB2 are calculated by a first-principles approach. The calculated extreme equilibrium mechanical properties are consistent with the available experimental and theoretical data. The calculated elastic moduli suggest that hcp-ReB2 has a low compressibility and is most likely an intrinsically …
Rhenium diboride is mixed to the molybdenum with various weight percentages such as 3, 5 and 8%. The material properties are evaluated for the sample specimens. Based on the comparison of material properties, molybdenum with 8% of rhenium diboride has been considered for these experimental investigations. Due to …
The five independent moduli required to construct the complete monocrystal elastic modulus tensor of the hexagonal-symmetry superhard compound ReB 2 were measured from 308 to 5 K using resonant ultrasound spectroscopy on a special-texture polycrystal. This is possible because, confirmed by X-ray diffraction, the specimen …
Abstract. Shear strength measurements have been carried out on rhenium diboride, ReB 2, to a pressure of 74 GPa using a Radial X-ray Diffraction (R-XRD) technique in a diamond anvil cell using platinum as an internal x-ray pressure standard.The R-XRD result has provided a unique insight into the deformation of hexagonal crystal …
Here the authors synthesize millimeter-sized samples of metallic, ultraincompressible and very hard rhenium nitride pernitride, recoverable at ambient …
Rhenium Diboride Like Metal, Crystal. Rhenium diboride resembles both a metal and a crystal in structure. It's hard enough to scratch a diamond - and can be made cheaply and easily, according to a a study by UCLA researchers. The material is made from the metal rhenium and the element boron. (Ingots of rhenium diboride are formed by …
Shear strength measurements have been carried out on rhenium diboride, ReB 2, to a pressure of 74 GPa using a Radial X-ray Diffraction (R-XRD) technique in a diamond anvil cell using platinum as an internal x-ray pressure standard.The R-XRD result has provided a unique insight into the deformation of hexagonal crystal lattice under non …
