In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses

R. Muñoz-Moreno, M. T. Pérez-Prado, E. M. Ruiz-Navas, C. J. Boehlert, J. Llorca

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 1 Citations

Abstract

The effect of stress on the deformation and crack nucleation and propagation mechanisms of a γ-TiAl intermetallic alloy (Ti-45Al-2Nb-2Mn (at.%) - 0.8v.%TiB2) was studied by means of in situ tensile (constant strain rate) and tensile-creep (constant load) experiments performed at 973 K inside a scanning electron microscope (SEM). The evolution of the microstructure and the nucleation and propagation of cracks was tracked during the high temperature mechanical tests in the SEM. Colony boundary crack nucleation was found to be activated during the secondary stage in creep tests at 300 MPa and 400 MPa and during the tertiary stage of the creep tests performed at higher stresses and at constant strain rate. Interlamellar ledges were only observed during the high stress tensile-creep tests (σ>400 MPa) and during the constant strain rate test. Quantitative measurements of the nature of the crack propagation path along secondary cracks and along the primary crack were carried out. It was found that colony boundaries were preferential sites for crack propagation under all the conditions investigated. The frequency of interlamellar cracking increased with increasing stress.

LanguageEnglish (US)
Title of host publicationMaterials Research Society Symposium Proceedings
Pages65-70
Number of pages6
Volume1516
DOIs
StatePublished - 2013
Event2012 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 25 2012Nov 30 2012

Other

Other2012 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/25/1211/30/12

Profile

tensile creep
Intermetallics
intermetallics
Creep
Electron microscopes
cracks
electron microscopes
creep tests
Cracks
Scanning
scanning
strain rate
Strain rate
Nucleation
nucleation
crack propagation
Crack propagation
ledges
propagation
Tensile stress

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Muñoz-Moreno, R., Pérez-Prado, M. T., Ruiz-Navas, E. M., Boehlert, C. J., & Llorca, J. (2013). In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. In Materials Research Society Symposium Proceedings (Vol. 1516, pp. 65-70). DOI: 10.1557/opl.2012.1583

In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. / Muñoz-Moreno, R.; Pérez-Prado, M. T.; Ruiz-Navas, E. M.; Boehlert, C. J.; Llorca, J.

Materials Research Society Symposium Proceedings. Vol. 1516 2013. p. 65-70.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Muñoz-Moreno, R, Pérez-Prado, MT, Ruiz-Navas, EM, Boehlert, CJ & Llorca, J 2013, In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. in Materials Research Society Symposium Proceedings. vol. 1516, pp. 65-70, 2012 MRS Fall Meeting, Boston, MA, United States, 11/25/12. DOI: 10.1557/opl.2012.1583
Muñoz-Moreno R, Pérez-Prado MT, Ruiz-Navas EM, Boehlert CJ, Llorca J. In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. In Materials Research Society Symposium Proceedings. Vol. 1516. 2013. p. 65-70. Available from, DOI: 10.1557/opl.2012.1583
Muñoz-Moreno, R. ; Pérez-Prado, M. T. ; Ruiz-Navas, E. M. ; Boehlert, C. J. ; Llorca, J./ In situ SEM observations of the tensile-creep deformation behavior and fracture mechanisms of a γ-TiAl intermetallic alloy at low and high stresses. Materials Research Society Symposium Proceedings. Vol. 1516 2013. pp. 65-70
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