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Article Dans Une Revue Philosophical Magazine Année : 2011

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

Résumé

Single crystals of Al-0.1% Mn were channel-die compressed to a true strain of 2.3 and their recovery behaviour at 240-320 degrees C investigated by microhardness measurements, electron backscatter diffraction (EBSD) microtexture mapping and X-ray line broadening analysis. The crystal orientations were the nominally stable Goss {110} < 001 >, brass {110} < 112 > and S {123} < 634 >. For all three orientations the microhardness decreases with a logarithmic time dependence 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 dependence 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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Dates et versions

hal-00856298 , version 1 (30-08-2013)

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Adeline Albou, András Borbély, Claire Maurice, Julian H. Driver. Orientation-dependent recovery in strongly deformed Al-0.1% Mn crystals. Philosophical Magazine, 2011, 91 (31), pp.3981-4000. ⟨10.1080/14786435.2011.600733⟩. ⟨hal-00856298⟩

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