Microstructure and high temperature mechanical properties of liquid-phase-sintered $α$-SiC with Y$_2$O$_3$-Al$_2$O$_3$ additions
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911776837206016 |
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| author | Rodríguez, Miguel Castillo Bernabé, Antonio Muñoz Rodríguez, Arturo Domínguez |
| author_facet | Rodríguez, Miguel Castillo Bernabé, Antonio Muñoz Rodríguez, Arturo Domínguez |
| contents | Samples of $α$-SiC have been sintered with liquid phase (LPS) to 1950 $^\circ$C, in atmosphere of argon and processing times between 1 and 7 hours. Using scanning electron microscopy (SEM) the microstructure of the samples has been characterized, being obtained average grain size that grows with the processing time from 0.64 to 1.61 $μ$m. These samples have been deformed in compression under constant load, to temperatures between 1450 and 1625 C, stresses between 25 and 450 MPa and strain rate between $4.2\times 10^{-8}$ and $1.5\times 10^{-6}$ s$^{-1}$. The creep parameters have been determined, obtaining for n values between 2.4 0.1 and 4.5 0.2 and Q=680 35 kJ.mol$^{-1}$ in samples sintered during 1 hour and n between 1.2 0.1 and 2.4 0.1 and Q=710 90 kJ.mol$^{-1}$ for samples sintered during 7 hours. These results have been correlated with the microstructure, being the grain boundary sliding (GBS) accommodated by lattice diffusion and the movement of dislocations the possible deformation mechanisms, operating both in a simultaneous way. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_02466 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Microstructure and high temperature mechanical properties of liquid-phase-sintered $α$-SiC with Y$_2$O$_3$-Al$_2$O$_3$ additions Rodríguez, Miguel Castillo Bernabé, Antonio Muñoz Rodríguez, Arturo Domínguez Materials Science Samples of $α$-SiC have been sintered with liquid phase (LPS) to 1950 $^\circ$C, in atmosphere of argon and processing times between 1 and 7 hours. Using scanning electron microscopy (SEM) the microstructure of the samples has been characterized, being obtained average grain size that grows with the processing time from 0.64 to 1.61 $μ$m. These samples have been deformed in compression under constant load, to temperatures between 1450 and 1625 C, stresses between 25 and 450 MPa and strain rate between $4.2\times 10^{-8}$ and $1.5\times 10^{-6}$ s$^{-1}$. The creep parameters have been determined, obtaining for n values between 2.4 0.1 and 4.5 0.2 and Q=680 35 kJ.mol$^{-1}$ in samples sintered during 1 hour and n between 1.2 0.1 and 2.4 0.1 and Q=710 90 kJ.mol$^{-1}$ for samples sintered during 7 hours. These results have been correlated with the microstructure, being the grain boundary sliding (GBS) accommodated by lattice diffusion and the movement of dislocations the possible deformation mechanisms, operating both in a simultaneous way. |
| title | Microstructure and high temperature mechanical properties of liquid-phase-sintered $α$-SiC with Y$_2$O$_3$-Al$_2$O$_3$ additions |
| topic | Materials Science |
| url | https://arxiv.org/abs/2402.02466 |