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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1453| Study of Coarsening in γ ' Precipitates by Diffusion Couples | |
| CARLOS GAMALIEL GARAY REYES IVANOVICH ESTRADA GUEL JESSICA LIZBETH HERNANDEZ RIVERA HECTOR JAVIER DORANTES ROSALES | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Difussion couples | |
| The Ni-rich Ni-Ti system has been studied by many researchers using many different techniques. The mentioned studies have concluded that cuboidal-type γ ' precipitates (L12 structure) aligned along <100> directions with faces parallel to {100} planes are the cause of hardening, but these precipitates coarsen at high-temperature and prolonged service time causing loss of coherency and eventually affect the mechanical properties. Coarsening is theoretically described by the model proposed by Lifshitz-Slyozov and Wagner (LSW theory) [1, 2] which predicts (for diffusion-controlled coarsening) precipitates dispersed in a fluid matrix (volume-fraction of the precipitates (fv) close to zero) that coarsen according to the relationship, r3= krt. A different behavior of kr during the coarsening has been reported for Ni-based alloys with elastic strains, where kr decreases in function of increasing fv (at low volume-fraction), which is known as anomalous coarsening [3-5]. Taking into account the anomalous coarsening with a more realistic model, where coarsening is independent fv, has been developed by Ardell and Ozolins [6] and Ardell [7] and is called trans-interface diffusion-controlled (TIDC) theory. A rate law of type <r>n kIt is predicted by the TIDC theory | |
| 2014 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Study of Coarsening in γ_ Precipitates by Diffusion Couples.pdf | 1.67 MB | Adobe PDF | Visualizar/Abrir |