In Situ Observations of the Deformation Behavior and Fracture Mechanisms of Ti-45Al-2Nb-2Mn + 0.8 vol pct TiB2
| العنوان: | In Situ Observations of the Deformation Behavior and Fracture Mechanisms of Ti-45Al-2Nb-2Mn + 0.8 vol pct TiB2 |
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| المؤلفون: | R. Muñoz-Moreno, M. Teresa Pérez-Prado, Carl J. Boehlert, Elisa M. Ruiz-Navas, Javier LLorca |
| المصدر: | Metallurgical and Materials Transactions A. 43:1198-1208 |
| بيانات النشر: | Springer Science and Business Media LLC, 2011. |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Stress (mechanics), Cracking, Materials science, Creep, Mechanics of Materials, Ultimate tensile strength, Metallurgy, Metals and Alloys, Fracture (geology), Intermetallic, Deformation (engineering), Condensed Matter Physics, Microstructure |
| الوصف: | The deformation and fracture mechanisms of a nearly lamellar Ti-45Al-2Nb-2Mn (at. pct) + 0.8 vol pct TiB2 intermetallic, processed into an actual low-pressure turbine blade, were examined by means of in situ tensile and tensile-creep experiments performed inside a scanning electron microscope (SEM). Low elongation-to-failure and brittle fracture were observed at room temperature, while the larger elongations-to-failure at high temperature facilitated the observation of the onset and propagation of damage. It was found that the dominant damage mechanisms at high temperature depended on the applied stress level. Interlamellar cracking was observed only above 390 MPa, which suggests that there is a threshold below which this mechanism is inhibited. Failure during creep tests at 250 MPa was controlled by intercolony cracking. The in situ observations demonstrated that the colony boundaries are damage nucleation and propagation sites during tensile creep, and they seem to be the weakest link in the microstructure for the tertiary creep stage. Therefore, it is proposed that interlamellar areas are critical zones for fracture at higher stresses, whereas lower stress, high-temperature creep conditions lead to intercolony cracking and fracture. |
| تدمد: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-011-1022-3 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::e9dcff1eaa96588cb92c788675d3af89 https://doi.org/10.1007/s11661-011-1022-3 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........e9dcff1eaa96588cb92c788675d3af89 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15431940 10735623 |
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| DOI: | 10.1007/s11661-011-1022-3 |