Open AccessIn-situ observations of dislocation recovery and low angle boundary formation in deformed aluminium
Author(s) -
Håkon Wiik Ånes,
Antonius T. J. van Helvoort,
Knut Marthinsen
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1270/1/012010
Subject(s) - misorientation , materials science , aluminium , annealing (glass) , dislocation , in situ , foil method , crystallography , transmission electron microscopy , metallurgy , composite material , grain boundary , microstructure , chemistry , organic chemistry , nanotechnology
An experimental study of the recovery of dislocations and low angle boundary formation in aluminium is presented. By combining in-situ annealing with orientation mapping in the transmission electron microscope, maps of geometrically necessary dislocation estimates derived from orientation measurements and subgrain formation can be quantitatively analysed. A thin foil of a commercially pure aluminium alloy cold-rolled to a true strain of ε = 2.3 and annealed in-situ in four steps of increasing temperatures from 170 °C to 560 °C was studied. An increase in the subgrain size and low angle boundary misorientation was accompanied by a halving of the dislocation density from 1.2 × 10 16 m −2 to 0.6 × 10 16 m −2 . Limited boundary migration was observed and the increased subgrain size was attributed to the dissolution of dislocations within the low angle boundaries upon annealing.