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Article Dans Une Revue Philosophical Magazine Année : 2011

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

Adeline Albou
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Andras Borbely
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Claire Maurice
Julian Haworth Driver
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Résumé

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°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°) compared with the Goss and S orientations (about 7-8°).

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Dates et versions

hal-00723597 , version 1 (11-08-2012)

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Adeline Albou, Andras Borbely, Claire Maurice, Julian Haworth Driver. Orientation dependent recovery in strongly deformed Al-0.1% Mn crystals. Philosophical Magazine, 2011, pp.1. ⟨10.1080/14786435.2011.600733⟩. ⟨hal-00723597⟩
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