Study of phase transition in Ti 50 Ni 47.5 Fe 2.5 alloy
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The micrographs of the deformed microstructures and their corresponding selected area electron diffraction (SAED) patterns (insets) are shown in Figures 4(a) and (b) [(i) through (iv)]. Figure 4(i) exhibits the extinction contours t15] from Cu-1 wt pct Zn-3 wt pct Sn alloy with foil orientation [213]. In its SAED pattern, a polycrystalline ring pattern is observed. Figure 4(ii) shows the bright-field image from Cu-1 wt pet Zn-15 wt pet Sn alloy containing high dislocation density, t~6] as also evidenced from the X-ray diffraction analysis, and its foil orientation is along [001], as indicated by its SAED pattern. Figure 4(iii) represents the bright-field image from Ag-1 wt pct Zn-2 wt pct Sn alloy showing the dislocation network with foil orientation along [111 ]. Figure 4(iv) shows the microstructure with the presence of precipitation t171 of one of the constituents of Ag-I wt pct Zn-10 wt pct Sn alloy. This, however, requires the composition analysis of energy-dispersive X-ray spectrum.
The authors are indebted to Professor O.N. Srivastava, Banaras Hindu University (BHU), for the help in the electron microscopic work. REFERENCES 1. S.K. Ghosh and S.P. Sen Gupta: J. Appl. Phys., 1983, vol. 54, pp. 6652-57. 2. A.K. Malty and S.P. Sen Gupta: Metall. Trans. A, 1990, vol. 21A, pp. 1327-30. 3. K.N. Goswami, S.P. Sen Gupta, and M.A. Quader: Acta Metall., 1966, vol. 14, pp. 1559-65. 4. S.K. Halder, M. De, and S.P. Sen Gupta: J. Appl. Phys., 1977, vol. 48, pp. 3560-65. 5. C.N.J. Wagner and J.C. HElion: J. Appl. Phys., 1965, vol. 36, pp. 2830-37. 6. R.P.I. Adler and C.N.J. Wagner: J. Appl. Phys., 1962, vol. 33, pp. 3451-58. 7. S.K. Chatterjee, S.K. Halder, and S.P. Sen Gupta: J. Appl. Phys., 1976, vol. 47, pp. 411-19. 8. B.E. Warren: X-ray Diffraction, Addison-Wesley, Reading, MA, 1969, ch. 13. 9. A.R. Stokes: Proc. Phys. Soc., London, 1948, vol. B61, pp. 382-91. 10. G. Simmons and H. Wang: Single Crystal Elastic Constants and Calculated Aggregate Properties, MIT Press, Cambridge, MA, 1971, p. 182, p. 264. 11. P.C.J. Gallagher: Metall. Trans., 1970, vol. 1, pp. 2429-61. 12. R.P. Reed and R.E. Schramm: J. Appl. Phys., 1974, vol. 45, pp. 4705-11. 13. L.F. Vassamillet and T.B. Massalski: J. Appl. Phys., 1963, vol. 34, pp. 3398-3402. 14. S.K. Halder and S.P. Sen Gupta: J. Appl. Phys., 1977, vol. 48, pp. 5306-10. 15. R.D. Heidenreich: J. Appl. Phys., 1949, vol. 20, pp. 993-1010. 16. M.J. Klein and R.A. Huggins: Acta Metall., 1962, vol. 10, pp. 55-62. 17. T.N. Baker: Proc. 7th Eur. Congr. on Electron Microscopy including the 9th Int. Conf. on X-Ray Optics and Microanalysis, The Hague, The Netherlands, Aug. 24-29, 1980, 7th Eur. Congr. on Electron Microscopy Foundation, Leiden, The Netherlands, 1980, vol. 3, pp. 44-45.
1322--VOLUME 21A, MAY 1990
Study of Phase Transition in TisoNI47.5Fezs Alloy JIANXI RAO, YUSHENG HE, and RUZHANG MA The premartensitic phase transitions in Ti-Ni-Fe alloy are the incommensurate transition (I) and commensurate transition (R). tl] This paper describes an investigation of the R transition in TisoNi
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