Revealing deformed and recrystallized structures in beta titanium alloys
- PDF / 1,932,916 Bytes
- 4 Pages / 594 x 774 pts Page_size
- 101 Downloads / 249 Views
The authors wish to thank The Department of Energy under Contract EY-76-A-01-2295 and the International Copper Research Association for financial support of this study.
REFERENCES 1. M.J. Saarivirta: Trans. TMS-AIME, 1960, vol. 218, p. 431. 2. V.K. Satin and N.J. Grant: Powder Metall. lnt'l., 1979, vol. 11, no. 4, p. 153. 3. A. Mance and A. Mihajlovic: J. Appl. Electrochem., 1981, vol. 11,
p. 299. 4. I. Kawakatsu, H. Suzuki, and H. Kitano: J. Jap. Inst. Metals, 1967, vol. 31, p. 1253. 5. U. Zwicker: Metall, 1962, vol. 16, p. 409. 6. M.J. Donachie:J. Inst. Metals, 1964, vol. 92, p. 180. 7. J.M. Vitek: Z. Metallkde., 1976, Bd. 67, H. 8, p. 559. 8. G. Hillmann and W. Hofmann:Z. Metallkde., 1965, vol. 56, p. 279. 9. L. Meny, M. Champigny, R. Beltrando, and P. Salaun: J. Microscopie, 1967, vol. 6, p. Ill. 10. A.J. Perry and W. Hugi: J. Inst. Metals, 1972, w)l. 100, p. 378. 11. P. Forey, J-L. Glimois, J-L. Feron, G. Develey, and C. Becle: C.R. Aead. Sci. Paris, 1980, t. 291, p. 177. 12. D.M.R. Taplin, N. Y. Tang, and G. L. Dunlop: Third Report INCRA project no. 327, 1982, New York, NY, Internat. Copper Res. Assn. 13. L. Bsenko: J. Less-Common Metals, 1975, vol. 40, p. 365. 14. J-P. Gabathuler, P. White, and E. Parth4: Acta Cryst., 1975, B. 31, p. 608. 15. V.A. Phillips: Metallography, 1974, vol. 7, p. 137.
size distribution in the lean metastable beta alloy Ti-10V2Fe-3A1. 2 During this work a method was developed to reveal simultaneously the location of prior deformed grain boundaries and the location of recrystallized grain boundaries not only in the as-annealed material but also during the recrystallization process and early stages of grain growth. This enables determination of the relationship between the deformed grains and the recrystallized structure to be made. It also reveals evidence of the nucleation sites of the recrystallized grains and shows the direction and stages of propagation of the growing grains. The details of this technique are presented and some preliminary results obtained on the Ti-10V-2Fe-3A1 alloy are discussed. Specimens (20 mm x 40 m m x 5 mm) at a nominal composition of Ti-10V-2Fe-3AI were deformed 35 pct at 1150 ~ and subsequently were metallographically polished to produce a mirror finish surface. Deep etching using a 60 ml HzO, 40 ml NH3, and 10 ml HF solution for 30 minutes at room temperature resulted in deep grooving at the deformed grain boundaries. The deformed and macro etched specimens were annealed for one hour at temperatures above 925 ~ under a dynamic vacuum of 10 -6 torr (1.33 z 10 -4 Pa) followed by oil quenching. The high temperature vacuum exposure resuited in a thermally etched beta grain structure, the result of different grains evaporating preferentially at different rates on different crystallographic planes. 3 This technique of thermal etching has been used in the past to delineate grain boundaries.4 The polished surface after annealing displays a recrystallized grain structure produced by thermal etching and deformed grains retained in the specimens as a result of
Data Loading...
