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J Krawczyk - One of the best experts on this subject based on the ideXlab platform.

  • the analysis of the hot Deformation behaviour of the ti 3al 8v 6cr 4zr 4mo alloy using Processing maps a map of microstructure and of hardness
    Materials & Design, 2015
    Co-Authors: A łukaszeksolek, J Krawczyk
    Abstract:

    Abstract Experimental stress–strain–strain rate-temperature, microstructure and hardness data of Ti–3Al–8V–6Cr–4Zr–4Mo were analyzed using dynamic material modelling, DMM. Processing, micro-structural changes and hardness maps were plotted. The influence of Deformation, within the true strain range 0.4–0.9, upon the formation of an instability area was assessed. The strain rate sensitivity parameter m, J co-content, the parameter of the effectiveness of power dissipation, η, and the parameter identifying flow instability (ξ ⩽ 0) are presented. The advisability of applying Deformation in excess of 50% is demonstrated. On the Processing maps, the domains guaranteeing stable Deformation Processing resulting in dynamically restructured crystallized structure, free of shape defects and cracks, are indicated. It was ascertained that the processes of recrystallization and dynamic recovery exert an influence on the strengthening of the alloy.

  • the analysis of the hot Deformation behaviour of the ti 3al 8v 6cr 4zr 4mo alloy using Processing maps a map of microstructure and of hardness
    Materials & Design, 2015
    Co-Authors: A łukaszeksolek, J Krawczyk
    Abstract:

    Abstract Experimental stress–strain–strain rate-temperature, microstructure and hardness data of Ti–3Al–8V–6Cr–4Zr–4Mo were analyzed using dynamic material modelling, DMM. Processing, micro-structural changes and hardness maps were plotted. The influence of Deformation, within the true strain range 0.4–0.9, upon the formation of an instability area was assessed. The strain rate sensitivity parameter m, J co-content, the parameter of the effectiveness of power dissipation, η, and the parameter identifying flow instability (ξ ⩽ 0) are presented. The advisability of applying Deformation in excess of 50% is demonstrated. On the Processing maps, the domains guaranteeing stable Deformation Processing resulting in dynamically restructured crystallized structure, free of shape defects and cracks, are indicated. It was ascertained that the processes of recrystallization and dynamic recovery exert an influence on the strengthening of the alloy.

A łukaszeksolek - One of the best experts on this subject based on the ideXlab platform.

  • the analysis of the hot Deformation behaviour of the ti 3al 8v 6cr 4zr 4mo alloy using Processing maps a map of microstructure and of hardness
    Materials & Design, 2015
    Co-Authors: A łukaszeksolek, J Krawczyk
    Abstract:

    Abstract Experimental stress–strain–strain rate-temperature, microstructure and hardness data of Ti–3Al–8V–6Cr–4Zr–4Mo were analyzed using dynamic material modelling, DMM. Processing, micro-structural changes and hardness maps were plotted. The influence of Deformation, within the true strain range 0.4–0.9, upon the formation of an instability area was assessed. The strain rate sensitivity parameter m, J co-content, the parameter of the effectiveness of power dissipation, η, and the parameter identifying flow instability (ξ ⩽ 0) are presented. The advisability of applying Deformation in excess of 50% is demonstrated. On the Processing maps, the domains guaranteeing stable Deformation Processing resulting in dynamically restructured crystallized structure, free of shape defects and cracks, are indicated. It was ascertained that the processes of recrystallization and dynamic recovery exert an influence on the strengthening of the alloy.

  • the analysis of the hot Deformation behaviour of the ti 3al 8v 6cr 4zr 4mo alloy using Processing maps a map of microstructure and of hardness
    Materials & Design, 2015
    Co-Authors: A łukaszeksolek, J Krawczyk
    Abstract:

    Abstract Experimental stress–strain–strain rate-temperature, microstructure and hardness data of Ti–3Al–8V–6Cr–4Zr–4Mo were analyzed using dynamic material modelling, DMM. Processing, micro-structural changes and hardness maps were plotted. The influence of Deformation, within the true strain range 0.4–0.9, upon the formation of an instability area was assessed. The strain rate sensitivity parameter m, J co-content, the parameter of the effectiveness of power dissipation, η, and the parameter identifying flow instability (ξ ⩽ 0) are presented. The advisability of applying Deformation in excess of 50% is demonstrated. On the Processing maps, the domains guaranteeing stable Deformation Processing resulting in dynamically restructured crystallized structure, free of shape defects and cracks, are indicated. It was ascertained that the processes of recrystallization and dynamic recovery exert an influence on the strengthening of the alloy.

Wilfredo Moscoso - One of the best experts on this subject based on the ideXlab platform.

  • controlling texture in magnesium alloy sheet by shear based Deformation Processing
    Acta Materialia, 2013
    Co-Authors: Dinakar Sagapuram, Wilfredo Moscoso, Srinivasan Chandrasekar, Mert Efe, Kevin P. Trumble
    Abstract:

    Abstract Constrained chip (sheet) formation by large strain extrusion machining is used to impose effective strains of ∼1 in Mg alloy AZ31B sheet in a single step of Deformation. High-speed image analysis shows the Deformation underlying sheet formation to be simple shear that is confined to a narrow zone. This confinement of the Deformation limits the need for pre-heating of the workpiece to realize continuous sheet forms. Tilted-basal textures, wherein the basal poles are inclined from the sheet surface normal, are achieved by this Processing. These textures are quite different from those prevalent in rolled sheet. By controlling the strain path, the basal pole inclination could be varied in the range 32–53°. The primary texture component is the B-fiber, indicating basal slip to be the main Deformation mode over the temperature range 165–400 °C. An additional C2-fiber component appears above 250 °C due to the activation of pyramidal 〈 c + a 〉 slip. In conjunction with these textures, microstructures ranging from ultrafine-grained (∼200 nm) to fine-grained (∼2 μm) could be obtained by controlling the Deformation temperature. Implications of the results for production of Mg sheet are discussed.

  • Deformation field in large strain extrusion machining and implications for Deformation Processing
    Scripta Materialia, 2012
    Co-Authors: Wilfredo Moscoso, Dinakar Sagapuram, Kevin P. Trumble, Srinivasan Chandrasekar
    Abstract:

    The Deformation field in large-strain extrusion machining, a constrained chip formation process, is characterized using high-speed imaging and particle image velocimetry. The field is shown to be controllable and narrowly confined, with attributes ranging from conventional Deformation Processing to severe plastic Deformation. Implications for Deformation Processing of sheets, engineering of microstructures in bulk forms and on machined surfaces, and study of large-strain Deformation phenomena in metal alloys are highlighted.

  • mechanics of large strain extrusion machining and application to Deformation Processing of magnesium alloys
    Acta Materialia, 2012
    Co-Authors: Mert Efe, Wilfredo Moscoso, Kevin P. Trumble, Dale W Compton, Srinivasan Chandrasekar
    Abstract:

    Abstract An analysis of the mechanics of large strain extrusion machining (LSEM), a constrained chip formation process, is presented for Deformation Processing of bulk alloys. The Deformation field is shown to be narrowly confined and controllable, with attributes ranging from conventional Deformation Processing to severe plastic Deformation. Controllable Deformation parameters include strain/strain rate, hydrostatic pressure, temperature and Deformation path. These attributes are highlighted in Deformation Processing of Mg AZ31B, an alloy of commercial significance but noted for its poor workability, into sheet and foil forms. Noteworthy features of the Processing are suppression of segmentation, realization of a range of strains and Deformation rates, engineering of microstructures ranging from conventional to ultrafine grained, and creation of sheet/foil from the bulk in a single step of Deformation without pre-heating. Guidelines for realizing specific sheet attributes, and scalability of LSEM for production are analyzed and discussed.

Srinivasan Chandrasekar - One of the best experts on this subject based on the ideXlab platform.

  • controlling texture in magnesium alloy sheet by shear based Deformation Processing
    Acta Materialia, 2013
    Co-Authors: Dinakar Sagapuram, Wilfredo Moscoso, Srinivasan Chandrasekar, Mert Efe, Kevin P. Trumble
    Abstract:

    Abstract Constrained chip (sheet) formation by large strain extrusion machining is used to impose effective strains of ∼1 in Mg alloy AZ31B sheet in a single step of Deformation. High-speed image analysis shows the Deformation underlying sheet formation to be simple shear that is confined to a narrow zone. This confinement of the Deformation limits the need for pre-heating of the workpiece to realize continuous sheet forms. Tilted-basal textures, wherein the basal poles are inclined from the sheet surface normal, are achieved by this Processing. These textures are quite different from those prevalent in rolled sheet. By controlling the strain path, the basal pole inclination could be varied in the range 32–53°. The primary texture component is the B-fiber, indicating basal slip to be the main Deformation mode over the temperature range 165–400 °C. An additional C2-fiber component appears above 250 °C due to the activation of pyramidal 〈 c + a 〉 slip. In conjunction with these textures, microstructures ranging from ultrafine-grained (∼200 nm) to fine-grained (∼2 μm) could be obtained by controlling the Deformation temperature. Implications of the results for production of Mg sheet are discussed.

  • Deformation field in large strain extrusion machining and implications for Deformation Processing
    Scripta Materialia, 2012
    Co-Authors: Wilfredo Moscoso, Dinakar Sagapuram, Kevin P. Trumble, Srinivasan Chandrasekar
    Abstract:

    The Deformation field in large-strain extrusion machining, a constrained chip formation process, is characterized using high-speed imaging and particle image velocimetry. The field is shown to be controllable and narrowly confined, with attributes ranging from conventional Deformation Processing to severe plastic Deformation. Implications for Deformation Processing of sheets, engineering of microstructures in bulk forms and on machined surfaces, and study of large-strain Deformation phenomena in metal alloys are highlighted.

  • mechanics of large strain extrusion machining and application to Deformation Processing of magnesium alloys
    Acta Materialia, 2012
    Co-Authors: Mert Efe, Wilfredo Moscoso, Kevin P. Trumble, Dale W Compton, Srinivasan Chandrasekar
    Abstract:

    Abstract An analysis of the mechanics of large strain extrusion machining (LSEM), a constrained chip formation process, is presented for Deformation Processing of bulk alloys. The Deformation field is shown to be narrowly confined and controllable, with attributes ranging from conventional Deformation Processing to severe plastic Deformation. Controllable Deformation parameters include strain/strain rate, hydrostatic pressure, temperature and Deformation path. These attributes are highlighted in Deformation Processing of Mg AZ31B, an alloy of commercial significance but noted for its poor workability, into sheet and foil forms. Noteworthy features of the Processing are suppression of segmentation, realization of a range of strains and Deformation rates, engineering of microstructures ranging from conventional to ultrafine grained, and creation of sheet/foil from the bulk in a single step of Deformation without pre-heating. Guidelines for realizing specific sheet attributes, and scalability of LSEM for production are analyzed and discussed.

Kevin P. Trumble - One of the best experts on this subject based on the ideXlab platform.

  • controlling texture in magnesium alloy sheet by shear based Deformation Processing
    Acta Materialia, 2013
    Co-Authors: Dinakar Sagapuram, Wilfredo Moscoso, Srinivasan Chandrasekar, Mert Efe, Kevin P. Trumble
    Abstract:

    Abstract Constrained chip (sheet) formation by large strain extrusion machining is used to impose effective strains of ∼1 in Mg alloy AZ31B sheet in a single step of Deformation. High-speed image analysis shows the Deformation underlying sheet formation to be simple shear that is confined to a narrow zone. This confinement of the Deformation limits the need for pre-heating of the workpiece to realize continuous sheet forms. Tilted-basal textures, wherein the basal poles are inclined from the sheet surface normal, are achieved by this Processing. These textures are quite different from those prevalent in rolled sheet. By controlling the strain path, the basal pole inclination could be varied in the range 32–53°. The primary texture component is the B-fiber, indicating basal slip to be the main Deformation mode over the temperature range 165–400 °C. An additional C2-fiber component appears above 250 °C due to the activation of pyramidal 〈 c + a 〉 slip. In conjunction with these textures, microstructures ranging from ultrafine-grained (∼200 nm) to fine-grained (∼2 μm) could be obtained by controlling the Deformation temperature. Implications of the results for production of Mg sheet are discussed.

  • Deformation field in large strain extrusion machining and implications for Deformation Processing
    Scripta Materialia, 2012
    Co-Authors: Wilfredo Moscoso, Dinakar Sagapuram, Kevin P. Trumble, Srinivasan Chandrasekar
    Abstract:

    The Deformation field in large-strain extrusion machining, a constrained chip formation process, is characterized using high-speed imaging and particle image velocimetry. The field is shown to be controllable and narrowly confined, with attributes ranging from conventional Deformation Processing to severe plastic Deformation. Implications for Deformation Processing of sheets, engineering of microstructures in bulk forms and on machined surfaces, and study of large-strain Deformation phenomena in metal alloys are highlighted.

  • mechanics of large strain extrusion machining and application to Deformation Processing of magnesium alloys
    Acta Materialia, 2012
    Co-Authors: Mert Efe, Wilfredo Moscoso, Kevin P. Trumble, Dale W Compton, Srinivasan Chandrasekar
    Abstract:

    Abstract An analysis of the mechanics of large strain extrusion machining (LSEM), a constrained chip formation process, is presented for Deformation Processing of bulk alloys. The Deformation field is shown to be narrowly confined and controllable, with attributes ranging from conventional Deformation Processing to severe plastic Deformation. Controllable Deformation parameters include strain/strain rate, hydrostatic pressure, temperature and Deformation path. These attributes are highlighted in Deformation Processing of Mg AZ31B, an alloy of commercial significance but noted for its poor workability, into sheet and foil forms. Noteworthy features of the Processing are suppression of segmentation, realization of a range of strains and Deformation rates, engineering of microstructures ranging from conventional to ultrafine grained, and creation of sheet/foil from the bulk in a single step of Deformation without pre-heating. Guidelines for realizing specific sheet attributes, and scalability of LSEM for production are analyzed and discussed.