Header menu link for other important links
X
Effect of back pressure on material flow and texture in ECAP of aluminum
A Panigrahi, N Scheerbaum, P Chekhonin, J Scharnweber, B Beausir, M Hockauf, , W Skrotzki
Published in Institute of Physics Publishing
2014
Volume: 63
   
Issue: 1
Abstract
Large billets (5 x 5 x 30) cm3 of technically pure aluminum (AA 1050) taken from thick rolled sheets were deformed at room temperature by single pass equal-channel angular pressing (ECAP). ECAP was done at different back pressures (0-60 MPa) using a square die with channels intersecting at 90° in sharp corners. The normal direction of rolling was taken parallel to the transverse direction of ECAP. The flow pattern was visualized by marker lines on split billets. The initial texture of the coarse-grained rolled sheet was measured by neutron diffraction. After ECAP, X-ray diffraction was used to measure the texture gradient from top to bottom of the billets. The results show, that with increasing back pressure the corner gap is closed and the flow line pattern becomes more symmetric. The flow line exponent increases strongly from top to bottom of the billets. Moreover, the inhomogeneous deformed zone at the bottom of the billets becomes smaller. The texture changes from a typical rolling texture to a typical shear texture with the intensity of the different shear texture components changing with back pressure. For the ACcomponent splitting is observed. The texture changes are discussed considering Toth's flow line model and grain refinement. © Published under licence by IOP Publishing Ltd.
About the journal
JournalIOP Conference Series: Materials Science and Engineering
PublisherInstitute of Physics Publishing
ISSN17578981
Open AccessYes
Concepts (17)
  •  related image
    Aluminum
  •  related image
    BILLETS (METAL BARS)
  •  related image
    Grain refinement
  •  related image
    Nanostructured materials
  •  related image
    Neutron diffraction
  •  related image
    Plastic deformation
  •  related image
    Pressing (forming)
  •  related image
    X ray diffraction
  •  related image
    Back pressures
  •  related image
    Coarse-grained
  •  related image
    INITIAL TEXTURES
  •  related image
    Normal direction
  •  related image
    ROLLING TEXTURE
  •  related image
    Room temperature
  •  related image
    SHEAR TEXTURE COMPONENTS
  •  related image
    TEXTURE GRADIENT
  •  related image
    Textures