Analysis of slip transfer and deformation behavior across the α/β interface in Ti-5Al-2.5Sn (wt.%) with an equiaxed microstructure

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Abstract

Slip transfer across the α/β interface was investigated in the near-α titanium alloy Ti-5Al-2.5Sn (wt.%). Globular β-phase grains, located primarily at α-phase grain boundaries, enabled the investigation of the orientation relationship between the α and β phases in the case of a general equiaxed microstructure. Active deformation systems were identified using electron backscattered diffraction (EBSD) supported by plane trace analysis. Information from the plane trace analysis was used to assess a number of metrics that could correlate with α/β slip transfer including: Schmid factors, the angle between slip plane normals (ψ), the angle between active Burgers' vectors (κ), and the α (0001){110} misorientation angle. From an analysis of 36 β grains, 15 α/β boundaries were found to exhibit the planar α (0001){110} Burgers' orientation relationship. The α phase, which dominated the microstructure, tended to exhibit slip traces for high global Schmid factor slip systems, including prism, basal, and pyramidal slip planes. When the neighboring β grain was oriented favorably for slip, i.e. exhibited a high Schmid factor, slip transfer was more likely across the α/β interface compared to when the neighboring β phase was not favorably oriented for slip. The alignment between the Burgers' vectors in the α and β phases was not well correlated with slip across the α/β interface. Furthermore, the boundaries having the α (0001){110} orientation relationship were not necessarily favorable for α/β slip transfer.

LanguageEnglish (US)
Pages61-68
Number of pages8
JournalMaterials Science and Engineering A
Volume552
DOIs
StatePublished - Aug 30 2012

Profile

Trace analysis
Burgers vector
slip
microstructure
Microstructure
Prisms
Titanium alloys
Electron diffraction
Crystal orientation
Grain boundaries
titanium alloys
misalignment
prisms
electron diffraction
grain boundaries
alignment

Keywords

  • α/β interface
  • Slip transfer
  • Titanium alloy

ASJC Scopus subject areas

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

Cite this

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title = "Analysis of slip transfer and deformation behavior across the α/β interface in Ti-5Al-2.5Sn (wt.{\%}) with an equiaxed microstructure",
abstract = "Slip transfer across the α/β interface was investigated in the near-α titanium alloy Ti-5Al-2.5Sn (wt.{\%}). Globular β-phase grains, located primarily at α-phase grain boundaries, enabled the investigation of the orientation relationship between the α and β phases in the case of a general equiaxed microstructure. Active deformation systems were identified using electron backscattered diffraction (EBSD) supported by plane trace analysis. Information from the plane trace analysis was used to assess a number of metrics that could correlate with α/β slip transfer including: Schmid factors, the angle between slip plane normals (ψ), the angle between active Burgers' vectors (κ), and the α (0001)/β {110} misorientation angle. From an analysis of 36 β grains, 15 α/β boundaries were found to exhibit the planar α (0001)/β {110} Burgers' orientation relationship. The α phase, which dominated the microstructure, tended to exhibit slip traces for high global Schmid factor slip systems, including prism, basal, and pyramidal slip planes. When the neighboring β grain was oriented favorably for slip, i.e. exhibited a high Schmid factor, slip transfer was more likely across the α/β interface compared to when the neighboring β phase was not favorably oriented for slip. The alignment between the Burgers' vectors in the α and β phases was not well correlated with slip across the α/β interface. Furthermore, the boundaries having the α (0001)/β {110} orientation relationship were not necessarily favorable for α/β slip transfer.",
keywords = "α/β interface, Slip transfer, Titanium alloy",
author = "Seal, {James R.} and Crimp, {Martin A.} and Bieler, {Thomas R.} and Boehlert, {Carl J.}",
year = "2012",
month = "8",
day = "30",
doi = "10.1016/j.msea.2012.04.114",
language = "English (US)",
volume = "552",
pages = "61--68",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
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TY - JOUR

T1 - Analysis of slip transfer and deformation behavior across the α/β interface in Ti-5Al-2.5Sn (wt.%) with an equiaxed microstructure

AU - Seal,James R.

AU - Crimp,Martin A.

AU - Bieler,Thomas R.

AU - Boehlert,Carl J.

PY - 2012/8/30

Y1 - 2012/8/30

N2 - Slip transfer across the α/β interface was investigated in the near-α titanium alloy Ti-5Al-2.5Sn (wt.%). Globular β-phase grains, located primarily at α-phase grain boundaries, enabled the investigation of the orientation relationship between the α and β phases in the case of a general equiaxed microstructure. Active deformation systems were identified using electron backscattered diffraction (EBSD) supported by plane trace analysis. Information from the plane trace analysis was used to assess a number of metrics that could correlate with α/β slip transfer including: Schmid factors, the angle between slip plane normals (ψ), the angle between active Burgers' vectors (κ), and the α (0001)/β {110} misorientation angle. From an analysis of 36 β grains, 15 α/β boundaries were found to exhibit the planar α (0001)/β {110} Burgers' orientation relationship. The α phase, which dominated the microstructure, tended to exhibit slip traces for high global Schmid factor slip systems, including prism, basal, and pyramidal slip planes. When the neighboring β grain was oriented favorably for slip, i.e. exhibited a high Schmid factor, slip transfer was more likely across the α/β interface compared to when the neighboring β phase was not favorably oriented for slip. The alignment between the Burgers' vectors in the α and β phases was not well correlated with slip across the α/β interface. Furthermore, the boundaries having the α (0001)/β {110} orientation relationship were not necessarily favorable for α/β slip transfer.

AB - Slip transfer across the α/β interface was investigated in the near-α titanium alloy Ti-5Al-2.5Sn (wt.%). Globular β-phase grains, located primarily at α-phase grain boundaries, enabled the investigation of the orientation relationship between the α and β phases in the case of a general equiaxed microstructure. Active deformation systems were identified using electron backscattered diffraction (EBSD) supported by plane trace analysis. Information from the plane trace analysis was used to assess a number of metrics that could correlate with α/β slip transfer including: Schmid factors, the angle between slip plane normals (ψ), the angle between active Burgers' vectors (κ), and the α (0001)/β {110} misorientation angle. From an analysis of 36 β grains, 15 α/β boundaries were found to exhibit the planar α (0001)/β {110} Burgers' orientation relationship. The α phase, which dominated the microstructure, tended to exhibit slip traces for high global Schmid factor slip systems, including prism, basal, and pyramidal slip planes. When the neighboring β grain was oriented favorably for slip, i.e. exhibited a high Schmid factor, slip transfer was more likely across the α/β interface compared to when the neighboring β phase was not favorably oriented for slip. The alignment between the Burgers' vectors in the α and β phases was not well correlated with slip across the α/β interface. Furthermore, the boundaries having the α (0001)/β {110} orientation relationship were not necessarily favorable for α/β slip transfer.

KW - α/β interface

KW - Slip transfer

KW - Titanium alloy

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SN - 0921-5093

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