Ductile Al-Cu-V amorphous alloys without metalloid
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S. No. I.
Designation WQ-A
2. 3. 4.
WQ-6CR-A WQ-12CR-A WQ-15CR-A
0.2 Pct Yield UTS Elongation Strength (MPa) (MPa) (Pct) 940 1028 6.0 895 10t4 5.1 980 1064 4.9 978 1060 2.5 1001 1040 3.4 !050 1094 1.9
the TMT on the strength and ductility of the material, and the observed differences are close to the scatter. The insensitivity of tensile properties to the size of the silicide precipitates in the present investigation is consistent with our earlier H observation, where variation in the size of silicides caused by aging of the water quenched specimens in the temperature range 923 to 1073 K had an almost negligible effect on the tensile properties, in particular, the ductility of the alloy. It is seen that even more uniform distribution of silicides through TMT does not result in any improvement of the tensile properties. The ductility is observed rather to decrease with the degree of cold reduction (Table II). The unexpected insensitivity of the tensile properties to refinement and even to improvement in the distribution of silicides through TMT may be attributed to development of some unfavorable texture.
The authors are grateful to Dr. P. Rama Rao, Director, Defence Metallurgical Research Laboratory, Hyderabad, India, for his interest and encouragement. The authors are also grateful to Professor H. Wollenberger and Dr. R. P. Wahi of Hahn-Meitner Institut fiir Kernforschung, Berlin (West) for their encouragement and kind permission for the use of IBASI facility. REFERENCES 1. C. Ramachandra and Vakil Singh: MetaIl. Trans. A, 1982, vol. 13A, pp. 771-75. 2. C. Ramachandra and Vakil Singh: Metall. Trans. A, 1985, vol. 16A, pp. 227-31. 3. Y. lmbert: J. of Less-Common Metals, 1974, vol. 37, pp. 71-89. 4. D.F. Neal and P.A. Blenkinsop: Titanium '80, Science and Technology, H. Kimura and O. lzumi, eds., TMS-AIME, New York, NY, 1980, vol. 2, pp. 12875. J.K. Tien, J. C. Chesnutt, and D. E. Peacock: Metafl. Trans., 1972, vol. 3, pp. 2542-44. 6. H.M. Flower, P. R. Swann, and D. R. F. West: Metall. Trans., 1971, vol. 2, pp. 3289-97. 7. P.S. Kotval and R . W . Calder: Metall. Trans., 1972, vol. 3, pp. 1308-11. 8. F. Barbier, C. Servant, C. Quesne, and P. Lacombe: J. Microsc. Spectrosc. Electron., 1981. voL 6, pp. 299-310. 9. A.T.K. Assadi, H. M. Flower, and D. R. F. West: Metals Technology, Jan. 1979, pp. 8-15. 10. D. E Neal: Forging and Properties of Aerospace Materials, Chameleon Press, London, The Metals Society, 1978, pp. 199-216. 11. C. Ramachandra: Ph.D. Thesis, Banaras Hindu University, Varanasi, India, 1985.
METALLURGICAL TRANSACTIONS A
Ductile Al-Cu-V Amorphous Alloys without Metalloid AN-PANG TSAI, AKIHISA INOUE, and TSUYOSHI MASUMOTO Al-based alloys are engineeringly important metallic materials, similar to Fe- and Ti-based alloys, and hence a large number of studies on the rapid solidification of Al-based alloys have been carried out with an aim to developing an Al-based alloy with high strength and high ductility by taking advantage of unique structural effects which can be achieved by rapid solidification.
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