Investigation of initial structures of aged ω-phase crystals in β-titanium alloys using high resolution electron microscopy

Micron

Volumn 28, Issue 4, 1997, Pages 269-277

  Sukedai, E ^a   Kitano, Y ^b   Ohnishi, A ^c  

^a OKAYAMA UNIVERSITY OF SCIENCE   (Japan)

^b SHIMANE UNIVERSITY   (Japan)

^c HITACHI LTD   (Japan)

Author keywords

titanium alloy; Aged phase; High resolution electron microscopy; In situ HREM; Initial structure

Indexed keywords

EID: 0030815878     PISSN: 09684328     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0968-4328(97)00035-8     Document Type: Article

References (25)

1. Ashby, M. F. and Jones, D. R. H. (1988) Engineering Materials 2, Pergamon Press.
2. Cockayne, D. J. H., Ray, I. L. F. and Whelan, M. J., 1969. Investigations of dislocation strain fields using weak beams. Philos. Mag., 20, 1265-1270.
3. de Fontaine, D. and Buck, O., 1973. A Monte Carlo simulation of the omega phase transformation. Philos. Mag., 27, 967-983.
4. Formanek, H., Muller, H., Hahn, M. H. and Koller, T., 1971. Visualization of single heavy atoms with the electron microscope. Naturwissenschaften, 58, 339-344.
5. Hashimoto, H., Kumao, A., Yotsumoto, H. and Ono, A., 1971. Image of thorium atoms in transmission electron microscopy. Japanese J. Appl. Phys., 10, 1115-1116.
6. Hashimoto, H., Kumao, A., Endoh, H., Nissen, H. U., Ono, A. and Watanabe, E., 1975. Lattice image contrast in many-beam dynamic theory and structure determination of labradorite feldspars. Proc. EMAG, 75, 245-250.
7. Hashimoto, H., Yokota, Y., Takai, Y., Tomita, M., Fujino, M. and Endoh, H., 1980. Dynamic and simultaneous observation of electron microscopic image and diffraction patterns of crystal lattice structure. Electron Microscopy, 1980, 118-119.
8. Henkelman, R. M. and Ottensmayer, F. P., 1971. Visualization of single heavy atoms by dark field electron microscopy. Proc. Natl. Acad. Sci. USA, 68, 3000-3004.
9. Hida, M., Sukedai, E. and Terauchi, H., 1988. Microscopic approaches to isothermal transformation of incommensurate omega phase zones in Ti-20wt%Mo alloy studied by XDS. HREM and EXAFS. Acta Metall., 36, 1429-1441.
10. Horiuchi, T., Sukedai, E., Shimoda, M. and Hashimoto, H., 1995. In situ high resolution electron microscope observations of ω-phase precipitation in β-type titanium alloys. Materials Transactions, JIM, 36, 1455-1462.
11. Makino, T., Furuhara, T. and Maki, T. (1994) Morphology and formation sites of α-phase precipitates due to low temperature aging in Ti-15V-3Cr-3Sn-3Al. Abstracts of The 115th Annual Meeting of Japan Inst. Metals, 482.
12. Mizuta, H., Sukedai, E. and Hashimoto, H. (1996) Investigation about aging behaviours of as-quenched ω-phase crystals in β-type Ti-Mo alloy using in situ dark field and high resolution electron microscopy. Proc. of 6th Asia-Pacific Conference on Electron Microscopy. 183-184.
13. Ohyama, H., Ashida, Y., Nishimura, T. and Maki, T., 1993. Effects of deformation temperature on deformed and aged microstructures and tensile properties in Ti-15V-3Cr-3Sn-3Al. ISIJ International, 33, 889-897.
14. Okuhara, J., Sukedai, E. and Hashimoto, H. (1996) High resolution electron microscope observations of as-quenched and aged SP 700 titanium alloy. Abstracts of The 119th Annual Meeting of Japan Inst. Metals, 115.
15. Sass, S. L., 1969. The ω-phase in a Zr-25at%Ti alloy. Acta Metall., 17, 813-820.
16. Schryvers, D. and Tanner, L. E. (1990) High-resolution electron microscopy observations of athermal omega phase in Ti-Mo alloys. Materials Science Forum, 56-58, 329-334.
17. Spence, J. C. H. (1988) Experimental High-Resolution Electron Microscopy, Oxford University Press.
18. Sukedai, E. and Hashimoto, H., 1992. Volume fraction of aged omega particles in Ti-20mass%Mo alloy. J. Japan Inst. Metals, 56, 1392-1400.
19. Sukedai, E., Hashimoto, H., Hida, M. and Mabuchi, H., 1992. Formation of ω-phase in Ti-Mo alloys after aging and deforming. Materials Science and Technology, 8, 3-9.
20. Sukedai, E., Liu, W., Awaji, M. and Horiuchi, T., 1994. Investigation of atomic structure of ω-phase crystals in Ti-Mo alloy using high resolution electron microscopy. Ultramicroscopy, 54, 192-200.
21. Sukedai, E., Horiuchi, T., Hashimoto, H., Minato, M., Kitano, Y. and Ohnishi, A., 1994. HREM study about ω phase crystals at early stages of aging of Ti-Mo alloy. Electron Microscopy, 2, 433-434.
22. Takemoto, Y., Hida, M. and Sakakibara, A., 1993. Mechanism of ω→α transformation in β-Ti alloy. J. Japan Inst. Metals, 57, 261-267.
23. Whelan, M. J. and Hirsch, P. B., 1957. Electron diffraction from crystals containing stacking faults I. Philos. Mag., 2, 1121-1142.
24. Whelan, M. J., Hirsch, P. B., Horen, R. W. and Bollmann, W., 1957. Dislocations and stacking faults in stainless steel. Proc. R. Soc. London, A240, 524-538.
25. Yukawa, T., Ohtani, S., Nishimura, T. and Sato, T. (1966) Phase transformation of titanium alloys by means of automatic transformation apparatus. The Science, Technology and Application of Titanium, pp. 699-710, Pergamon Press