Exploring the hardness and high-pressure behavior of osmium and ruthenium-doped rhenium diboride solid solutions
Source abstract
Abstract
Rhenium diboride (ReB2) 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 ReB2. ReB2-structured solid solutions (Re0.98Os0.02B2 and Re0.98Ru0.02B2, noted as “ReOsB2” and “ReRuB2”) were synthesized via arc-melting from the pure elements. In-situ high-pressure radial x-ray diffraction was performed in the diamond anvil cell to study the incompressibility and lattice strain of ReOsB2 and ReRuB2 up to ∼56 GPa. Both solid solutions exhibit higher incompressibility and differential strain than pure ReB2. However, while all lattice planes are strengthened by doping osmium (Os) into the ReB2 structure, only the weakest ReB2 lattice plane is enhanced with ruthenium (Ru). These results are in agreement with the Vickers hardness measurements of the two systems, where higher hardness was observed in ReOsB2. The combination of high-pressure studies with experimentally observed hardness data provides lattice specific information about the strengthening mechanisms behind the intrinsic hardness enhancement of the ReB2 system.
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Research context
OpenAlex topics: Boron and Carbon Nanomaterials Research · Metal and Thin Film Mechanics · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry and Biochemistry, University of California, Los Angeles (UCLA) 1 , Los Angeles, California 90095, USA
Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University 2 , Richmond, Virginia 23284, USA
Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles (UCLA) 3 , Los Angeles, California 90095, USA
Department of Materials Science and Engineering, University of California, Los Angeles (UCLA) 4 , Los Angeles, California 90095, USA
California NanoSystems Institute (CNSI), University of California, Los Angeles (UCLA) 5 , Los Angeles, California 90095, USA
Funding
National Science Foundation · U.S. Department of Energy
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