Kinetics of coherent order-disorder transition in Al3 Zr
Laurent Proville, Alphonse Finel
Abstract
Within a phase field approach which takes the strain-induced elasticity into account, the kinetics of the coherent order-disorder transition is investigated for the specific case of Al3 Zr alloy. It is shown that a microstructure with cubic L12 precipitates appears as a transient state during the decomposition of a homogeneous disordered solid solution into a microstructure with tetragonal DO23 precipitates embedded into a disordered matrix. At low enough temperature, favored by a weak internal stress, only L12 precipitates grow in the transient microstructure preceding nucleation of the DO23 precipitates that occurs exclusively at the interface of the solid solution with the L12 precipitates. Analysis of microstructures at nanoscopic scale shows a characteristic rod shape for the DO23 precipitates due to the combination of their tetragonal symmetry and their large internal stress.
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