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Einfluss von Verformungsgradienten auf die Kornfeinung während ECAP im industriellen Maßstab
Author(s) -
Frint P.,
Hockauf M.,
Dietrich D.,
Halle T.,
Wagner M. F.X.,
Lampke T.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100839
Subject(s) - electron backscatter diffraction , misorientation , materials science , microstructure , grain size , metallurgy , deformation (meteorology) , composite material , grain boundary , shear (geology)
The microstructure of the aluminium alloy 6060 after industrial scale (cross‐section 50×50 mm 2 ) equal‐channel angular pressing (ECAP) is studied. We focus on processing without additional backpressure in order to allow the formation of a corner gap and the corresponding development of a distinct strain gradient after one pass. Low voltage scanning transmission electron microscopy (STEM) and electron backscatter diffraction analysis (EBSD) are used to determine the average grain size, grain boundary misorientation angles and grain shape aspect ratios. These microstructural parameters are analysed for three characteristic locations from top to bottom within the billet. Our EBSD observations clearly document the occurrence of global strain gradients and microstructural heterogeneity. The STEM analyses expand the information on this heterogeneous deformation for the investigated locations in the sub‐micrometer range. In good agreement with previous studies, our results provide detailed information on how a heterogeneous induced shear strain affects microstructure and mechanical properties when ECAP is performed without backpressure.

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