Analysis of slip activity and heterogeneous deformation in tension and tension-creep of Ti-5Al-2.5Sn (wt %) using in-situ SEM experiments

Research output: Contribution to journalArticle

  • 16 Citations

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. Tensile experiments were performed at 296K and 728K (≈0.4T m), while tensile-creep experiments were performed at 728K and 763K. Active deformation systems were identified using electron backscattered diffraction-based slip trace analysis. Both basal and prismatic slip systems were active during the tensile experiments. Basal slip was observed for grains clustered around high Schmid factor orientations, while prismatic slip exhibited less dependence on the crystallographic orientation. The tension-creep experiments revealed less slip but more development of grain boundary ledges than in the higher strain rate tensile experiments. Some of the grain boundary ledges evolved into grain boundary cracks, and grain boundaries oriented nearly perpendicular to the tensile axis formed ledges earlier in the deformation process. Grain boundaries with high misorientations also tended to form ledges earlier than those with lower misorientations. Most of the grain boundary cracks formed in association with grains displaying hard orientations, where the c-axis was nearly perpendicular to the tensile direction. For the tension-creep experiments, pronounced basal slip was observed in the lower-stress creep regime and the activity of prismatic slip increased with increasing creep stress and temperature.

LanguageEnglish (US)
Pages2923-2946
Number of pages24
JournalPhilosophical Magazine
Volume92
Issue number23
DOIs
StatePublished - Aug 11 2012

Profile

slip
ledges
grain boundaries
scanning electron microscopy
misalignment
cracks
tensile creep
strain rate
electron diffraction
electron microscopes
scanning
temperature

Keywords

  • creep
  • dislocation slip
  • grain boundary sliding
  • tension
  • titanium alloy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

@article{068c1e4ad18842f297a4c505f4982d5d,
title = "Analysis of slip activity and heterogeneous deformation in tension and tension-creep of Ti-5Al-2.5Sn (wt {\%}) using in-situ SEM experiments",
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. Tensile experiments were performed at 296K and 728K (≈0.4T m), while tensile-creep experiments were performed at 728K and 763K. Active deformation systems were identified using electron backscattered diffraction-based slip trace analysis. Both basal and prismatic slip systems were active during the tensile experiments. Basal slip was observed for grains clustered around high Schmid factor orientations, while prismatic slip exhibited less dependence on the crystallographic orientation. The tension-creep experiments revealed less slip but more development of grain boundary ledges than in the higher strain rate tensile experiments. Some of the grain boundary ledges evolved into grain boundary cracks, and grain boundaries oriented nearly perpendicular to the tensile axis formed ledges earlier in the deformation process. Grain boundaries with high misorientations also tended to form ledges earlier than those with lower misorientations. Most of the grain boundary cracks formed in association with grains displaying hard orientations, where the c-axis was nearly perpendicular to the tensile direction. For the tension-creep experiments, pronounced basal slip was observed in the lower-stress creep regime and the activity of prismatic slip increased with increasing creep stress and temperature.",
keywords = "creep, dislocation slip, grain boundary sliding, tension, titanium alloy",
author = "H. Li and Boehlert, {C. J.} and Bieler, {T. R.} and Crimp, {M. A.}",
year = "2012",
month = "8",
day = "11",
doi = "10.1080/14786435.2012.682174",
language = "English (US)",
volume = "92",
pages = "2923--2946",
journal = "Philosophical Magazine",
issn = "1478-6435",
publisher = "Taylor and Francis Ltd.",
number = "23",

}

TY - JOUR

T1 - Analysis of slip activity and heterogeneous deformation in tension and tension-creep of Ti-5Al-2.5Sn (wt %) using in-situ SEM experiments

AU - Li,H.

AU - Boehlert,C. J.

AU - Bieler,T. R.

AU - Crimp,M. A.

PY - 2012/8/11

Y1 - 2012/8/11

N2 - The deformation behavior of a Ti-5Al-2.5Sn (wt %) near-α alloy was investigated during in-situ deformation inside a scanning electron microscope. Tensile experiments were performed at 296K and 728K (≈0.4T m), while tensile-creep experiments were performed at 728K and 763K. Active deformation systems were identified using electron backscattered diffraction-based slip trace analysis. Both basal and prismatic slip systems were active during the tensile experiments. Basal slip was observed for grains clustered around high Schmid factor orientations, while prismatic slip exhibited less dependence on the crystallographic orientation. The tension-creep experiments revealed less slip but more development of grain boundary ledges than in the higher strain rate tensile experiments. Some of the grain boundary ledges evolved into grain boundary cracks, and grain boundaries oriented nearly perpendicular to the tensile axis formed ledges earlier in the deformation process. Grain boundaries with high misorientations also tended to form ledges earlier than those with lower misorientations. Most of the grain boundary cracks formed in association with grains displaying hard orientations, where the c-axis was nearly perpendicular to the tensile direction. For the tension-creep experiments, pronounced basal slip was observed in the lower-stress creep regime and the activity of prismatic slip increased with increasing creep stress and temperature.

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. Tensile experiments were performed at 296K and 728K (≈0.4T m), while tensile-creep experiments were performed at 728K and 763K. Active deformation systems were identified using electron backscattered diffraction-based slip trace analysis. Both basal and prismatic slip systems were active during the tensile experiments. Basal slip was observed for grains clustered around high Schmid factor orientations, while prismatic slip exhibited less dependence on the crystallographic orientation. The tension-creep experiments revealed less slip but more development of grain boundary ledges than in the higher strain rate tensile experiments. Some of the grain boundary ledges evolved into grain boundary cracks, and grain boundaries oriented nearly perpendicular to the tensile axis formed ledges earlier in the deformation process. Grain boundaries with high misorientations also tended to form ledges earlier than those with lower misorientations. Most of the grain boundary cracks formed in association with grains displaying hard orientations, where the c-axis was nearly perpendicular to the tensile direction. For the tension-creep experiments, pronounced basal slip was observed in the lower-stress creep regime and the activity of prismatic slip increased with increasing creep stress and temperature.

KW - creep

KW - dislocation slip

KW - grain boundary sliding

KW - tension

KW - titanium alloy

UR - http://www.scopus.com/inward/record.url?scp=84864992957&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864992957&partnerID=8YFLogxK

U2 - 10.1080/14786435.2012.682174

DO - 10.1080/14786435.2012.682174

M3 - Article

VL - 92

SP - 2923

EP - 2946

JO - Philosophical Magazine

T2 - Philosophical Magazine

JF - Philosophical Magazine

SN - 1478-6435

IS - 23

ER -