Hostname: page-component-76fb5796d-22dnz Total loading time: 0 Render date: 2024-04-27T14:29:09.652Z Has data issue: false hasContentIssue false
  • English
  • Français

Kinetic Calculation of L10 Ordered System Based on Phase Field Methodand Cluster Variation Method

Published online by Cambridge University Press:  11 February 2011

M. Ohno  and
T. Mohri
M. Ohno
Affiliation:
Division of Material Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060–8628, Japan
T. Mohri
Affiliation:
Division of Material Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060–8628, Japan
Get access

Abstract

During ordering process, anti-site ordering proceeds in atomistic scale and anti-phase domain structure evolves in microstructural scale. In order to describe both the processes, a hybridized calculation of the Phase Field Method(PFM) and Cluster Variation Method(CVM) is attempted. The main objective of the present study is focused on the time evolution of atomic configuration during L10 ordering processes below and above the spinodal ordering temperature and their resultant microstructures. In order to investigate the interplay between atomistic and microstructural processes, we conducted two types of calculations. One is for a homogeneous system without an anti-phase boundary and the other is for an inhomogeneous system in which microstructure is formed by anti-phase domains.

For the homogeneous system, the relaxation curve of Long-Range-Order parameter(LRO) indicates a transient appearance of an L12-like atomic configuration below the spinodal ordering temperature. Such an L12–like state corresponds to a saddle point configuration in the CVM free energy surface. When the composition of an alloy is located near L10 + L12 phase field in the phase diagram, the L12–like phase becomes highly ordered state.

For the inhomogeneous system, it is implied that the appearance of the L12-like phase affects the resultant microstructure by providing the nucleation sites for the L10 ordered phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.44
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERNCES

1. Chen, L. Q., Annual Rev. Mat. Res., 32, 113(2002).Google Scholar
2. Karma, A., Encyclopedia of Materials; Science and Technology (Elsevier), 6873(2001).Google Scholar
3. Kikuchi, R., Phys. Rev. 81, 998(1951).Google Scholar
4. Mohri, T., Sahchez, J. M. and de Fontaine, D., Acta Metall., 33, 1463(1985).Google Scholar
5. Ohno, M. and Mohri, T., Mater. Trans., 42, 2033(2001).Google Scholar
6. Ohno, M. and Mohri, T., Mater. Sci. Eng., A312, 50(2001); Mater. Trans., 43, 2189(2002); Phil. Mag. A., (in print); Proceedings of Third International Alloy Conference (in print).Google Scholar
7. de Fontaine, D., Acta Metall., 23, 553(1975).Google Scholar
8. Belashchenko, K. D., Yu Dobrestov, V., Pankratov, I. R., Samolyuk, G D. and Vaks, V. G., J. Phys. Condens. Matter, 11, 10593(1999); K. D. Belashchenko, G D. Samolyuk and V. G. Vaks, 11, 10567(1999).Google Scholar
9. Allen, S. M. and Cahn, J. W., Acta Metall., 24, 425(1976).Google Scholar
10. Cahn, J. W. and Hilliard, J. E., J. Chem. Phys., 28, 258(1958).Google Scholar
11. Richard, M. J. and Chan, J. W., Acta Metal., 19, 1263(1971).Google Scholar
12. Chen, L.-Q., Wang, Y. and Khachaturyan, A. G., Phil. Mag. Let., 65, 15(1992).Google Scholar