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Orientation dependent recovery in strongly deformed Al-0.1%Mn crystals

Abstract : Single crystals of Al-0.1%Mn have been channel-die compressed to a true strain of 2.3 and their recovery behaviour at 240-320 degrees C investigated by microhardness measurements, EBSD microtexture mapping and X-ray line broadening analysis. The crystal orientations are the nominally stable Goss {110}< 001 >, brass {110}< 112 > and S {123}< 634 >. For all three orientations the microhardness decreases with a logarithmic time dependency but the instantaneous recovery rates of the Brass oriented crystals are systematically lower than those of the other two orientations by a factor of about 2. The dislocation densities decrease rapidly in the first stages of recovery (<1 min) by dislocation dipole annihilation and more slowly thereafter. In the Goss and S orientations the later stage of recovery is due to sub-grain growth. The orientation dependency is ascribed to the relatively low misorientations developed by plastic straining in the Brass crystals (average about 4 degrees) compared with the Goss and S orientations (about 7-8 degrees).
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Adeline Albou, Andras Borbely, Claire Maurice, J.H. Driver. Orientation dependent recovery in strongly deformed Al-0.1%Mn crystals. Materials Science Forum, Trans Tech Publications Inc., 2013, 753, pp.225-230. ⟨10.4028/⟩. ⟨emse-00963721⟩



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