Field kinetic model and computer simulation of precipitation of L1{sub 2} ordered intermetallics from f.c.c. solid solution
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
- Rutgers-the State Univ. of New Jersey, Piscataway, NJ (United States). Dept. of Ceramic Engineering
A phenomenological stochastic field kinetic model of coherent precipitation of L1{sub 2} ordered intermetallics from a disordered f.c.c. solid solution has been developed. It explicitly takes into account both the lattice misfit strain and the four types of antiphase domains formed as a result of the L1{sub 2} ordering. Based on the concentration wave representation of the ordered state, a coarse grain approximation of the non-equilibrium free energy functional of concentration and long-range order parameters has been formulated. Its relation to the microscopic free energy model has been discussed. Precipitation kinetics and microstructural development of {gamma}{prime} phase in Ni-Al have been investigated by two-dimensional computer simulations based on this model. The results reveal new features which are attributed to the L1{sub 2} ordering. The ordered nature of the precipitates changes the coarsening mechanisms and kinetics and greatly affect the morphology of the mesoscopic microstructure.
- OSTI ID:
- 619535
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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