Analysis of the tension and creep behavior of Ti-5Al-2. 5Sn(wt. %) using in-situ SEM experiments

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

Abstract

The deformation behavior of a Ti-5Al-2. 5Sn(wt. % ) near α alloy was investigated during in-situ deformation inside a scanning electron microscope (SEM). Tensile experiments were performed at 23°C and 455°C (≈0. 4Tm) .andtensile-creep experiments were performed at 455°C. Both basal and prismatic slip systems were active during the 23°C and 455°C tension tests,hut deformation twinning was not observed. During 23°C deformation, basal slip systems with Schmid factors greater than 0. 25 were observed. At 455"C ,basal slip was activated on systems with Schmid factors greater than 0. 1. During creep, grain boundary ledges formed, some of which evolved into grain boundary cracks, indicating that grain boundary sliding is an active deformation mechanism. Grain boundaries with initial misorientation angles greater than 30° tended to form ledges earlier in the deformation process than boundaries with lower misorientation angles, Less than 10% of the grains imaged in-situ exhibited surface slip traces and a majority of these grains exhibited basal slip. The creep experiments revealed less slip and more grain boundary ledges than in the higher strain rate tensile experiments performed at the same temperature.

LanguageEnglish (US)
Title of host publicationTi 2011 - Proceedings of the 12th World Conference on Titanium
Pages937-941
Number of pages5
Volume2
StatePublished - 2012
Event12th World Conference on Titanium, Ti 2011 - Beijing, China
Duration: Jun 19 2011Jun 24 2011

Other

Other12th World Conference on Titanium, Ti 2011
CountryChina
CityBeijing
Period6/19/116/24/11

Profile

Creep
Electron microscopes
Scanning
Grain boundaries
Experiments
Grain boundary sliding
Twinning
Strain rate
Cracks
Temperature

Keywords

  • Creep
  • Deformation mechanism
  • Slip trace
  • Tension
  • Titanium alloys

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Li, H., Boehlert, C. J., Bieler, T. R., & Crimp, M. A. (2012). Analysis of the tension and creep behavior of Ti-5Al-2. 5Sn(wt. %) using in-situ SEM experiments. In Ti 2011 - Proceedings of the 12th World Conference on Titanium (Vol. 2, pp. 937-941)

Analysis of the tension and creep behavior of Ti-5Al-2. 5Sn(wt. %) using in-situ SEM experiments. / Li, Hongmei; Boehlert, Carl J.; Bieler, Thomas R.; Crimp, Martin A.

Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 2 2012. p. 937-941.

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

Li, H, Boehlert, CJ, Bieler, TR & Crimp, MA 2012, Analysis of the tension and creep behavior of Ti-5Al-2. 5Sn(wt. %) using in-situ SEM experiments. in Ti 2011 - Proceedings of the 12th World Conference on Titanium. vol. 2, pp. 937-941, 12th World Conference on Titanium, Ti 2011, Beijing, China, 6/19/11.
Li H, Boehlert CJ, Bieler TR, Crimp MA. Analysis of the tension and creep behavior of Ti-5Al-2. 5Sn(wt. %) using in-situ SEM experiments. In Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 2. 2012. p. 937-941.
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AB - The deformation behavior of a Ti-5Al-2. 5Sn(wt. % ) near α alloy was investigated during in-situ deformation inside a scanning electron microscope (SEM). Tensile experiments were performed at 23°C and 455°C (≈0. 4Tm) .andtensile-creep experiments were performed at 455°C. Both basal and prismatic slip systems were active during the 23°C and 455°C tension tests,hut deformation twinning was not observed. During 23°C deformation, basal slip systems with Schmid factors greater than 0. 25 were observed. At 455"C ,basal slip was activated on systems with Schmid factors greater than 0. 1. During creep, grain boundary ledges formed, some of which evolved into grain boundary cracks, indicating that grain boundary sliding is an active deformation mechanism. Grain boundaries with initial misorientation angles greater than 30° tended to form ledges earlier in the deformation process than boundaries with lower misorientation angles, Less than 10% of the grains imaged in-situ exhibited surface slip traces and a majority of these grains exhibited basal slip. The creep experiments revealed less slip and more grain boundary ledges than in the higher strain rate tensile experiments performed at the same temperature.

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