Effect of stress level on the high temperature deformation and fracture mechanisms of Ti-45Al-2Nb-2Mn-0.8 vol. pct TiB2: An in situ experimental study

Rocío Muñoz-Moreno, M. Teresa Pérez-Prado, Javier Llorca, Elisa María Ruiz-Navas, Carl J. Boehlert

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Abstract

The effect of the applied stress on the deformation and crack nucleation and propagation mechanisms of a γ-TiAl intermetallic alloy (Ti-45Al-2Nb-2Mn (at. pct)-0.8 vol. pct TiB2) was examined by means of in situ tensile (constant strain rate) and tensile-creep (constant load) experiments performed at 973 K (700 C) using a scanning electron microscope. Colony boundary cracking developed during the secondary stage in creep tests at 300 and 400 MPa and during the tertiary stage of the creep tests performed at higher stresses. Colony boundary cracking was also observed in the constant strain rate tensile test. Interlamellar ledges were only found during the tensile-creep tests at high stresses (σ > 400 MPa) and during the constant strain rate tensile test. Quantitative measurements of the nature of the crack propagation path along secondary cracks and along the primary crack indicated that colony boundaries were preferential sites for crack propagation under all the conditions investigated. The frequency of interlamellar cracking increased with stress, but this fracture mechanism was always of secondary importance. Translamellar cracking was only observed along the primary crack.

LanguageEnglish (US)
Pages1887-1896
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume44
Issue number4
DOIs
StatePublished - Apr 2013

Profile

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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

Cite this

Effect of stress level on the high temperature deformation and fracture mechanisms of Ti-45Al-2Nb-2Mn-0.8 vol. pct TiB2 : An in situ experimental study. / Muñoz-Moreno, Rocío; Pérez-Prado, M. Teresa; Llorca, Javier; Ruiz-Navas, Elisa María; Boehlert, Carl J.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 44, No. 4, 04.2013, p. 1887-1896.

Research output: Contribution to journalArticle

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