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.

    Original languageEnglish (US)
    Pages (from-to)61-68
    Number of pages8
    JournalMaterials Science and Engineering A
    Volume552
    DOIs
    StatePublished - Aug 30 2012

    Profile

    Microstructure
    slip
    Round Ligament
    Carbamyl Phosphate
    Burgers vector
    Trace analysis
    Antitubercular Agents
    Melphalan
    Titanium alloys
    Electron diffraction
    Crystal orientation
    Grain boundaries
    Prisms
    microstructure
    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",
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    volume = "552",
    pages = "61--68",
    journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
    issn = "0921-5093",
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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

    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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