Kinetics of coherent order-disorder transition in $Al_3 Zr$

Details Kinetics of coherent order-disorder transition in $Al_3 Zr$ Kinetics of coherent order-disorder transition in $Al_3 Zr$

2001-09-14

arxiv.org/abs/cond-mat/0109262v1

Phys. Rev. B Vol. 64 Id: 054104

Physics

Condensed Matter

Materials Science

2 postscript figures and 1 JPG page

Scientific paper

10.1103/PhysRevB.64.054104

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 $Al_3 Zr$ alloy. It is shown that a microstructure with cubic $L1_2$ precipitates appears as a transient state during the decomposition of a homogeneous disordered solid solution into a microstructure with tetragonal $DO_{23}$ precipitates embedded into a disordered matrix. At low enough temperature, favored by a weak internal stress, only $L1_2$ precipitates grow in the transient microstructure preceding nucleation of the $DO_{23}$ precipitates that occurs exclusively at the interface of the solid solution with the $L1_2$ precipitates. Analysis of microstructures at nanoscopic scale shows a characteristic rod shape for the $DO_{23}$ precipitates due to the combination of their tetragonal symmetry and their large internal stress.

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