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000207256 0247_ $$2doi$$a10.1016/j.jallcom.2015.01.291
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000207256 02470 $$2ISI$$a000350915200027
000207256 037__ $$aARTICLE
000207256 245__ $$aHexagonal OsB2: Sintering, microstructure and mechanical properties
000207256 269__ $$a2015
000207256 260__ $$bElsevier$$c2015$$aLausanne
000207256 300__ $$a11
000207256 336__ $$aJournal Articles
000207256 520__ $$aThe metastable high pressure ReB2-type hexagonal OsB2 bulk ceramics was produced by spark plasma sintering. The phase composition, microstructure, and mechanical behavior of the sintered OsB2 were studied by X-ray diffraction, optical microscopy, TEM, SEM, EDS, and nanoindentation. The produced ceramics was rather porous and contained a mixture of hexagonal (similar to 80 wt.%) and orthorhombic (similar to 20 wt.%) phases as identified by X-ray diffraction and EBSD analysis. Two boron-rich phases, which do not contain Os, were also identified by TEM and SEM/EDS analysis. Nanoindentation measurements yielded a hardness of 31 +/- 9 GPa and Young's modulus of 574 +/- 112 GPa, indicating that the material is rather hard and very stiff; however, it is very prone to crack formation and propagation, which is indicative of a very brittle nature of this material. Improvements in the sintering regime are required in order to produce dense, homogeneous and single phase hexagonal OsB2 bulk ceramics. (C) 2015 Elsevier B.V. All rights reserved.
000207256 6531_ $$aOsmium diboride
000207256 6531_ $$aMechanical properties
000207256 6531_ $$aNanoindentation
000207256 6531_ $$aCeramic
000207256 700__ $$uUniv Cent Florida, Dept Mech & Aerosp Engn, Orlando, FL 32816 USA$$aXie, Zhilin
000207256 700__ $$uUniv Cent Florida, Dept Mech & Aerosp Engn, Orlando, FL 32816 USA$$aLugovy, Mykola
000207256 700__ $$uUniv Cent Florida, Dept Mech & Aerosp Engn, Orlando, FL 32816 USA$$aOrlovskaya, Nina
000207256 700__ $$uEmpa, Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland$$aGraule, Thomas
000207256 700__ $$uEmpa, Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland$$aKuebler, Jakob
000207256 700__ $$uEcole Polytech Fed Lausanne, Lab Mech Met, CH-1015 Lausanne, Switzerland$$aMueller, Martin
000207256 700__ $$uTexas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA$$aGao, Huili
000207256 700__ $$uTexas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA$$aRadovic, Miladin
000207256 700__ $$aCullen, David A.
000207256 773__ $$j634$$tJournal Of Alloys And Compounds$$q168-178
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