Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W)
Core‒rim structures were identified as a common feature in hot-pressed ZrB2‒SiC‒MC ceramics (M = Nb, Hf, Ta and W) by a combination of X-ray diffraction, scanning and transmission electron microscopies. Quantitative analyses associate them with the bi-solubility of M in ZrB2 phase, in which transiti...
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| Format: | Article |
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Elsevier
2021-01-01
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| Series: | Journal of Materiomics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352847820300903 |
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| author | Dong-Li Hu Hui Gu Ji Zou Qiang Zheng Guo-Jun Zhang |
| author_facet | Dong-Li Hu Hui Gu Ji Zou Qiang Zheng Guo-Jun Zhang |
| author_sort | Dong-Li Hu |
| collection | DOAJ |
| description | Core‒rim structures were identified as a common feature in hot-pressed ZrB2‒SiC‒MC ceramics (M = Nb, Hf, Ta and W) by a combination of X-ray diffraction, scanning and transmission electron microscopies. Quantitative analyses associate them with the bi-solubility of M in ZrB2 phase, in which transition of solubility across the core/rim boundary is abrupted, signifying their creation via dissolution‒reprecipitation process facilitated by transient liquid-phase. The cores were retained from starting powder after surface melting and the rims were grown from the liquid-phase to incorporate more solutes, leaving the residual liquid to turn into ZrC phase with higher solubility of M. We propose g-point scheme in the ZrB2‒MB2 diagrams to combine the bi-solubility and the core‒rim structures into an intra-phase relationship created by sintering, leading further to a hierarchical phase relationship. The temperature dependence of flexural strength in the ZrB2‒SiC‒MC ceramics varies with MC additions, which can be respectively strengthened by the strain energy created in the core‒rim structures and metal segregation to grain boundaries. |
| first_indexed | 2024-03-12T08:30:21Z |
| format | Article |
| id | doaj.art-fffa172e6e2f4274b082017331eea4e1 |
| institution | Directory Open Access Journal |
| issn | 2352-8478 |
| language | English |
| last_indexed | 2024-03-12T08:30:21Z |
| publishDate | 2021-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materiomics |
| spelling | doaj.art-fffa172e6e2f4274b082017331eea4e12023-09-02T17:50:05ZengElsevierJournal of Materiomics2352-84782021-01-01716979Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W)Dong-Li Hu0Hui Gu1Ji Zou2Qiang Zheng3Guo-Jun Zhang4School of Materials Sciences and Engineering, Materials Genome Institute, Shanghai University, Shanghai, 200444, China; State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, ChinaSchool of Materials Sciences and Engineering, Materials Genome Institute, Shanghai University, Shanghai, 200444, China; Corresponding author.School of Metallurgy and Materials, University of Birmingham, B15 2TT, UKCAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, ChinaState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Research Institute of Function Materials, Donghua University, Shanghai, 201620, ChinaCore‒rim structures were identified as a common feature in hot-pressed ZrB2‒SiC‒MC ceramics (M = Nb, Hf, Ta and W) by a combination of X-ray diffraction, scanning and transmission electron microscopies. Quantitative analyses associate them with the bi-solubility of M in ZrB2 phase, in which transition of solubility across the core/rim boundary is abrupted, signifying their creation via dissolution‒reprecipitation process facilitated by transient liquid-phase. The cores were retained from starting powder after surface melting and the rims were grown from the liquid-phase to incorporate more solutes, leaving the residual liquid to turn into ZrC phase with higher solubility of M. We propose g-point scheme in the ZrB2‒MB2 diagrams to combine the bi-solubility and the core‒rim structures into an intra-phase relationship created by sintering, leading further to a hierarchical phase relationship. The temperature dependence of flexural strength in the ZrB2‒SiC‒MC ceramics varies with MC additions, which can be respectively strengthened by the strain energy created in the core‒rim structures and metal segregation to grain boundaries.http://www.sciencedirect.com/science/article/pii/S2352847820300903Ultra-high-temperature ceramicsCore‒rim structuresBi-solubilitySolution‒reprecipitation process |
| spellingShingle | Dong-Li Hu Hui Gu Ji Zou Qiang Zheng Guo-Jun Zhang Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W) Journal of Materiomics Ultra-high-temperature ceramics Core‒rim structures Bi-solubility Solution‒reprecipitation process |
| title | Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W) |
| title_full | Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W) |
| title_fullStr | Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W) |
| title_full_unstemmed | Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W) |
| title_short | Core‒rim structure, bi-solubility and a hierarchical phase relationship in hot-pressed ZrB2‒SiC‒MC ceramics (M=Nb, Hf, Ta, W) |
| title_sort | core rim structure bi solubility and a hierarchical phase relationship in hot pressed zrb2 sic mc ceramics m nb hf ta w |
| topic | Ultra-high-temperature ceramics Core‒rim structures Bi-solubility Solution‒reprecipitation process |
| url | http://www.sciencedirect.com/science/article/pii/S2352847820300903 |
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