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

    Microstructure
    slip
    microstructure
    Trace analysis
    Burgers vector
    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.}",
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    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

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    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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