Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale
A dual phase boride and carbide ceramic with the nominal composition (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 and (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C was prepared by reactive synthesis and consolidated by spark plasma sintering. The resulting microstructure contained about 30% (in volume) boride and 70% carbide. Comp...
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Elsevier
2025-01-01
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| Series: | Journal of Materiomics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S235284782400131X |
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| author | Steven M. Smith, II Nicola Gilli William G. Fahrenholtz Gregory E. Hilmas Sandra García-González Emilio Jiménez-Piqué Stefano Curtarolo Laura Silvestroni |
| author_facet | Steven M. Smith, II Nicola Gilli William G. Fahrenholtz Gregory E. Hilmas Sandra García-González Emilio Jiménez-Piqué Stefano Curtarolo Laura Silvestroni |
| author_sort | Steven M. Smith, II |
| collection | DOAJ |
| description | A dual phase boride and carbide ceramic with the nominal composition (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 and (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C was prepared by reactive synthesis and consolidated by spark plasma sintering. The resulting microstructure contained about 30% (in volume) boride and 70% carbide. Compositional inhomogeneities were observed within single grains that had core-shell structures and preferential accumulation of specific metals in the boride or carbide phases. Specifically, Ti and Nb had higher concentrations in the boride, whereas Hf and Ta in the carbide. The Zr concentration was relatively equally distributed in the two phases. The dual phase ceramic had additional, distinctive features including nanosized inclusions, possibly related to local miscibility gaps and supersaturation, linear defects, and strain due to adjustment of the crystal structure. As a consequence, the fracture mode was transgranular with the crack path deviated by these nanometric microstructure alterations. Nanoindentation under 5 mN measured higher hardness and modulus for the boride, 30 GPa and 525 GPa, as compared to the carbide phase, 22 GPa and 425 GPa, due to a higher concentration of dislocation tangles and strains deriving from the introduction of metals with different sizes (and properties) in a less compliant hexagonal lattice. |
| format | Article |
| id | doaj-art-d1effef20d144ac7a0a4ffda8564630c |
| institution | Kabale University |
| issn | 2352-8478 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj-art-d1effef20d144ac7a0a4ffda8564630c2025-01-04T04:56:38ZengElsevierJournal of Materiomics2352-84782025-01-01111100905Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscaleSteven M. Smith, II0Nicola Gilli1William G. Fahrenholtz2Gregory E. Hilmas3Sandra García-González4Emilio Jiménez-Piqué5Stefano Curtarolo6Laura Silvestroni7University of Science and Technology, Materials Science and Engineering Department, Rolla, MO, USACNR-IMM, Institute of Microelectronics and Microsystems, Bologna, ItalyUniversity of Science and Technology, Materials Science and Engineering Department, Rolla, MO, USAUniversity of Science and Technology, Materials Science and Engineering Department, Rolla, MO, USADept. of Materials Science and Eng., EEBE, Univ. Politècnica de Catalunya-BarcelonaTECH., Barcelona, SpainDept. of Materials Science and Eng., EEBE, Univ. Politècnica de Catalunya-BarcelonaTECH., Barcelona, Spain; Barcelona Research Center in Multiscale Science and Eng. - Univ. Politècnica de Catalunya-BarcelonaTECH., Barcelona, SpainCenter for Extreme Materials, Duke University, Durham, NC, USA; Department of Mechanical Engineering and Materials Science, Duke University, NC, USACNR-ISSMC, Institute of Science, Technology and Sustainability for Ceramic Materials, Faenza, Italy; Corresponding author.A dual phase boride and carbide ceramic with the nominal composition (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2 and (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C was prepared by reactive synthesis and consolidated by spark plasma sintering. The resulting microstructure contained about 30% (in volume) boride and 70% carbide. Compositional inhomogeneities were observed within single grains that had core-shell structures and preferential accumulation of specific metals in the boride or carbide phases. Specifically, Ti and Nb had higher concentrations in the boride, whereas Hf and Ta in the carbide. The Zr concentration was relatively equally distributed in the two phases. The dual phase ceramic had additional, distinctive features including nanosized inclusions, possibly related to local miscibility gaps and supersaturation, linear defects, and strain due to adjustment of the crystal structure. As a consequence, the fracture mode was transgranular with the crack path deviated by these nanometric microstructure alterations. Nanoindentation under 5 mN measured higher hardness and modulus for the boride, 30 GPa and 525 GPa, as compared to the carbide phase, 22 GPa and 425 GPa, due to a higher concentration of dislocation tangles and strains deriving from the introduction of metals with different sizes (and properties) in a less compliant hexagonal lattice.http://www.sciencedirect.com/science/article/pii/S235284782400131XHigh entropy borideHigh entropy carbideSegregationNanoindentationTEM |
| spellingShingle | Steven M. Smith, II Nicola Gilli William G. Fahrenholtz Gregory E. Hilmas Sandra García-González Emilio Jiménez-Piqué Stefano Curtarolo Laura Silvestroni Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale Journal of Materiomics High entropy boride High entropy carbide Segregation Nanoindentation TEM |
| title | Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale |
| title_full | Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale |
| title_fullStr | Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale |
| title_full_unstemmed | Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale |
| title_short | Dual-phase ceramics based on multi-cation boride and carbide: Investigations at the nanoscale |
| title_sort | dual phase ceramics based on multi cation boride and carbide investigations at the nanoscale |
| topic | High entropy boride High entropy carbide Segregation Nanoindentation TEM |
| url | http://www.sciencedirect.com/science/article/pii/S235284782400131X |
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