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Improvement in drawability (r value) of an aluminum alloy subjected to groove pressing
Ganesh Niranjan,
Published in Trans Tech Publications Ltd
2010
Volume: 638-642
   
Pages: 1911 - 1916
Abstract
There is increasing interest in using Al alloy sheets for auto body applications. However Al alloys exhibit poor drawability as indicated by low values of the normal anisotropy, rm. Techniques for improving the value of rm rely on developing a favourable shear texture in the sheet. In this study, Al alloy AA 6061 sheets of dimensions 225 mm x 200 mm and 1 mm thick were subjected to severe plastic deformation by repeated groove pressing using a set of grooved and flat dies alternatively. The orientation of the grooves with respect to the rolling direction was also varied. Microstructure characterization and mechanical property measurements were carried out. X-ray diffraction scans were carried out to measure the relative intensities of the (111) and (200) peaks. The r values was measured as per ASTM standard E 517 on strip specimens cut at 0° , 45° and 90° to the rolling direction and the normal anisotropy value (rm) and planar anisotropy value (△r) values were determined. The limiting drawing ratio (LDR) was determined using the Swift cupping test techniques. It was observed that the rm values increased from 0.72 in the as received condition to a maximum of 0.94 and the LDR increased from 1.93 to 2.06 when the groove pressing was carried out with grooves at to 45° the rolling direction. The improvement in rm values can be correlated to the texture developing in the sheet as a result of severe plastic deformation. © (2010) Trans Tech Publications.
About the journal
JournalMaterials Science Forum
PublisherTrans Tech Publications Ltd
ISSN02555476
Open AccessNo
Concepts (27)
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    AL ALLOY SHEET
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    Al alloys
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    Astm standards
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    AUTO BODY
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    DRAWABILITY
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    FLAT DIES
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    GROOVE PRESSING
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    LIMITING DRAWING RATIO
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    MECHANICAL PROPERTY MEASUREMENTS
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    MICROSTRUCTURE CHARACTERIZATION
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    Normal anisotropy
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    PLANAR ANISOTROPY
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    R VALUE
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    Relative intensity
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    Rolling direction
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    SEVERE PLASTIC DEFORMATIONS
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    Shear texture
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    STRIP SPECIMEN
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    Test techniques
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    Aluminum
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    Aluminum sheet
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    Anisotropy
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    Mechanical properties
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    Plastic deformation
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    Plastic sheets
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    Textures
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    Aluminum alloys