Hexagonal OsB2: Sintering, microstructure and mechanical properties
Abstract
In this study, the 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 (~80 wt.%) and orthorhombic (~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; but, 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.
- Authors:
-
- Univ. of Central Florida, Orlando, FL (United States)
- Univ. of Central Florida, Orlando, FL (United States); Institute for Problems of Materials Science, Kyiv (Ukraine)
- Laboratory for High Performance Ceramics, Dubendorf (Switzerland)
- Laboratory for High Performance Ceramics, Dubendorf (Switzerland)
- Laboratory of Mechanical Metallurgy, EPFL, Lausanne (Switzerland)
- Texas A & M Univ., College Station, TX (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1265283
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Alloys and Compounds
- Additional Journal Information:
- Journal Volume: 634; Journal ID: ISSN 0925-8388
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Osmium diboride; Mechanical properties; Nanoindentation; Ceramic
Citation Formats
Xie, Zhilin, Lugovy, Mykola, Orlovskaya, Nina, Graule, Thomas, Kuebler, Jakob, Mueller, Martin, Gao, Huili, Radovic, Miladin, and Cullen, David A. Hexagonal OsB2: Sintering, microstructure and mechanical properties. United States: N. p., 2015.
Web. doi:10.1016/j.jallcom.2015.01.291.
Xie, Zhilin, Lugovy, Mykola, Orlovskaya, Nina, Graule, Thomas, Kuebler, Jakob, Mueller, Martin, Gao, Huili, Radovic, Miladin, & Cullen, David A. Hexagonal OsB2: Sintering, microstructure and mechanical properties. United States. https://doi.org/10.1016/j.jallcom.2015.01.291
Xie, Zhilin, Lugovy, Mykola, Orlovskaya, Nina, Graule, Thomas, Kuebler, Jakob, Mueller, Martin, Gao, Huili, Radovic, Miladin, and Cullen, David A. Sat .
"Hexagonal OsB2: Sintering, microstructure and mechanical properties". United States. https://doi.org/10.1016/j.jallcom.2015.01.291. https://www.osti.gov/servlets/purl/1265283.
@article{osti_1265283,
title = {Hexagonal OsB2: Sintering, microstructure and mechanical properties},
author = {Xie, Zhilin and Lugovy, Mykola and Orlovskaya, Nina and Graule, Thomas and Kuebler, Jakob and Mueller, Martin and Gao, Huili and Radovic, Miladin and Cullen, David A.},
abstractNote = {In this study, the 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 (~80 wt.%) and orthorhombic (~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; but, 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.},
doi = {10.1016/j.jallcom.2015.01.291},
journal = {Journal of Alloys and Compounds},
number = ,
volume = 634,
place = {United States},
year = {Sat Feb 07 00:00:00 EST 2015},
month = {Sat Feb 07 00:00:00 EST 2015}
}
Web of Science