| Numéro |
J. Phys. Colloques
Volume 48, Numéro C6, Novembre 1987
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
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| Page(s) | C6-391 - C6-396 | |
| DOI | https://doi.org/10.1051/jphyscol:1987664 | |
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
J. Phys. Colloques 48 (1987) C6-391-C6-396
DOI: 10.1051/jphyscol:1987664
1 Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816, Japan
2 Sharp Corp., Tenri, Nara 632, Japan
3 Nippondenso Co., Ltd., Kariya, Aichi 448, Japan
J. Phys. Colloques 48 (1987) C6-391-C6-396
DOI: 10.1051/jphyscol:1987664
FIELD ION MICROSCOPIC OBSERVATION OF ORDERING PROCESS IN A CuPt ALLOY
N. Kuwano1, M. Umeda1, A. Mukai2, N. Kawahara3 et K. Oki11 Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816, Japan
2 Sharp Corp., Tenri, Nara 632, Japan
3 Nippondenso Co., Ltd., Kariya, Aichi 448, Japan
Abstract
Change in microstructure of CuPt alloy was studied by field ion microscopy. It was found that in a quenched alloy small spherical ordered domains with a low degree of order are dispersed in a disordered matrix. The size of the domains was estimated to be about 1 ~ 2 nm. Upon aging at an appropriate temperature, the size of the ordered domains preferencially increases, and then the degree of order inside the domains increases by a significant extent to reach the equilibrium value. The kinetic behavior of the ordered domains was analyzed with thermodynamics, and it was concluded that excess increases in strain energy and surface energy of the ordered domains suppress the development of degree of order in the early stage of aging.