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Flow Stress and Elongation of Superplastic Deformation in La55Al25Ni20 Metallic Glass

Published online by Cambridge University Press:  10 February 2011

Y. Kawamura  and
A. Inoue
Y. Kawamura
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan, rivervil@imr.tohoku.ac.jp
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan, rivervil@imr.tohoku.ac.jp
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Abstract

We have investigated the flow stress and elongation of superplastic deformation in a La55Al25Ni20 (at%) metallic glass that has a wide supercooled liquid region of 72 K before crystallization. The superplasticity that appeared in the supercooled liquid region was generated by the Newtonian viscous flow that exhibits the m value of unity. The elongation to failure was restricted by the transition of the Newtonian flow to non-Newtonian one and the crystallization during deformation. We succeeded in establishing the constitutive formulation of the flow stress in the supercooled liquid region. Its formulation was expressed very well by a stretched exponential function σflow=Dε exp(H*/RT) [1-exp(E/{ε exp(H**/RT)}0.82)]. Formulations describing the elongation to failure in constant-strain-rate and constant-crosshead velocity tests were, moreover, established. It was found from the simulation that the maximum elongation in the constant-strain-rate test reached more than 106% which was two orders of magnitude larger than that in the constant-crosshead-velocity test.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 303
Copyright
Copyright © Materials Research Society 2000

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References

1. Kawamura, Y., Shibata, T., Inoue, A. and Masumoto, T., Scripta Metall. Mater. 37, 431 (1997).10.1016/S1359-6462(97)00105-XGoogle Scholar
2. Kawamura, Y., Nakamura, T. andInoue, A., Scripta Metall. Mater. 39, 301 (1998).10.1016/S1359-6462(98)00163-8Google Scholar
3. Kawamura, Y., Shibata, T. and Inoue, A. in The Third Pacific Rim International Conference on Advanced Materials & Processing (PRICM 3), edited by Imam, M.A., DeNale, R., Hanada, S., Zhong, Z. and Lee, D.N. (TMS, Warrendale, PA, 1998), p. 490–493.Google Scholar
4. Nakamura, T., Kawamura, Y. and Inoue, A., Mater. Sci. Forum 304–306, 379 (1999).10.4028/www.scientific.net/MSF.304-306.379Google Scholar
5. Kawamura, Y., Nakamura, T. and Inoue, A., Mater. Sci. Forum 304–306, 349 (1999).10.4028/www.scientific.net/MSF.304-306.349Google Scholar
6. Kawamura, Y., Nakamura, T. and Inoue, A., Mater. Trans. JIM 40, 794 (1999).10.2320/matertrans1989.40.794Google Scholar
7. Wadsworth, J., Nieh, T. G. and Sherby, O. D. in Superplasticity in Advanced Materials, edited by Hori, S., Tokizane, M. and Furushiro, N. (The Jpn. Soc. of Research on Superplasticity, Japan 1991), p. 13.Google Scholar
8. Ohsawa, H., J. Mater. Process. Technol. 68, 193 (1997).10.1016/S0924-0136(96)00101-XGoogle Scholar
9. Sakuma, T., Mater. Sci. Forum 304–306, 3 (1999).10.4028/www.scientific.net/MSF.304-306.3Google Scholar
10. Smirnov, O. M., Mater. Sci. Forum 304–306, 341 (1999).10.4028/www.scientific.net/MSF.304-306.341Google Scholar
11. Nieh, T. G., Mukai, T., Liu, C. T. and Wadsworth, J., Scripta Mater. 40, 1021 (1999).10.1016/S1359-6462(99)00071-8Google Scholar
12. Sakuma, T. and Higashi, K., Mater. Trans. JIM 40, 702 (1999).10.2320/matertrans1989.40.702Google Scholar
13. Kawamura, Y., Kato, H., Inoue, A. and Masumoto, T., Appl. Phys. Lett. 67, 2008 (1995).10.1063/1.114769Google Scholar
14. Kawamura, Y., Kato, H., Inoue, A. and Masumoto, T., Int. J. Powder Metall. 33, 50 (1997).Google Scholar
15. Kawamura, Y., Kato, H., Inoue, A. and Masumoto, T., Mater. Sci. Eng. A219, 39 (1996).10.1016/S0921-5093(96)10437-8Google Scholar
16. Kawamura, Y., Shibata, T., Inoue, A. and Masumoto, T., Acta Mater. 37, 253 (1998).10.1016/S1359-6454(97)00235-8Google Scholar
17. Vintage, V. I. P. Model Amorphous Face Golf Club Catalog, Dunlop, Tokyo (1998).Google Scholar
18. Kawamura, Y., Shibata, T., Inoue, A. and Masumoto, T., Appl. Phys. Lett. 69, 1208 (1996).10.1063/1.117413Google Scholar
19. Kawamura, Y., Shibata, T., Inoue, A. and Masumoto, T., Jpn. J. Appl. Phys. 37, L666 (1998).10.1143/JJAP.37.L666Google Scholar
20. Kawamura, Y., Shibata, T.,Inoue, A. and Masumoto, T., Appl. Phys. Lett. 71, 779 (1997).10.1063/1.119643Google Scholar
21. Kawamura, Y., Shibata, T.,Inoue, A. and Masumoto, T., Mater. Trans. JIM 40, 336 (1999).Google Scholar
22. Inoue, A., Kawamura, Y. and Saotome, Y., Mater. Sci. Forum 233–234, 147 (1997).Google Scholar