Abstract
Effects of reduction, reinforcements, and dynamic precipitation on grain refinement by hot extrusion have been investigated in a Si3N4w/Al-Mg-Si (6061) composite by tensile tests and microstructural investigation. The grain refinement was attributed to an interaction of recrystallization and dynamic precipitation, which was enhanced by reinforcements. Not only fine-grained microstructure, but also relaxing stress concentrations which are caused at matrix/reinforcement interfaces during superplastic flow are required to attain large elongations. Partial melting resulting from segregation plays an important role in relaxing the stress concentrations. DSC investigations revealed that the degree of segregation was increased by hot extrusion.
Similar content being viewed by others
References
T. G. Nieh, C. A. Henshall, and J. Wadsworth, Scripta Metall. 18, 1405 (1984).
M. W. Mahoney and A. K. Ghosh, Metall. Trans. A 18A, 653 (1987).
J. Pilling, Scripta Metall. 23, 1375 (1989).
T. Imai, M. Mabuchi, Y. Tozawa, and M. Yamada, J. Mater. Sci. Lett. 9, 255 (1990).
H. Xiaoxu, L. Qing, C. K. Yao, and Y. Mei, J. Mater. Sci. Lett. 10, 964 (1991).
M. Mabuchi, T. Imai, K. Kubo, K. Higashi, Y. Okada, and S. Tanimura, Mater. Lett. 11, 339 (1991).
M. Mabuchi, K. Higashi, Y. Okada, S. Tanimura, T. Imai, and K. Kubo, Scripta Metall. Mater. 25, 2517 (1991).
K. Higashi, T. Okada, T. Mukai, S. Tanimura, T. G. Nieh, and J. Wadsworth, Scripta Metall. Mater. 26, 185 (1992).
M. Mabuchi, K. Higashi, and T. G. Langdon, Acta Metall. Mater. 42, 1739 (1994).
M. Mabuchi and K. Higashi, Mater. Trans. JIM 35, 399 (1994).
O. D. Sherby and J. Wadsworth, Prog. Mater. Sci. 33, 169 (1989).
T. G. Nieh, P. S. Gilman, and J. Wadsworth, Scripta Metall. 19, 1375 (1985).
T. R. Bieler, T. G. Nieh, J. Wadsworth, and A. K. Mukherjee, Scripta Metall. 22, 81 (1988).
K. Higashi, T. Okada, T. Mukai, and S. Tanimura, Scripta Metall. Mater. 25, 2053 (1991).
K. Higashi, Mater. Sci. Eng. A A166, 109 (1993).
J. A. Wert, N. E. Paton, C. H. Hamilton, and M. W. Mahoney, Metall. Trans. A 12A, 1267 (1981).
B. M. Watts, M. J. Stowell, B. L. Baikie, and D. G. E. Owen, Metal. Sci. 10, 189 (1976).
B. M. Watts, M. J. Stowell, B. L. Baikie, and D. G. E. Owen, Metal. Sci. 10, 198 (1976).
E. Nes, J. Mater. Sci. 13, 2052 (1978).
T. R. McNelley, E-W. Lee, and M. E. Mills, Metall. Trans. A 17A, 1035 (1986).
E-W. Lee, T. R. McNelley, and A. F. Stengle, Metall. Tarns. A 17A, 1043 (1986).
S. J. Hales and T. R. McNelley, Acta Metall. 36, 1229 (1988).
S. J. Hales, T. R. McNelley, and H. J. McQueen, Metall. Trans. A 22A, 1037 (1991).
M. Mabuchi and K. Higashi, in Recrystallization ‘92, edited by M. Fuentes and J. G. Sevillano (Trans Tech Publications, Aedermannsdorf, Switzerland, 1992), p. 545.
T. G. Nieh and J. Wadsworth, Mater. Sci. Eng. A A147, 129 (1991).
T. G. Nieh, J. Wadsworth, and T. Imai, Scripta Metall. Mater. 26, 703 (1992).
M. Mabuchi and K. Higashi, Philos. Mag. Lett. 70, 1 (1994).
J. Koike, M. Mabuchi, and K. Higashi, Acta Metall. Mater. 43, 199 (1995).
J. Koike, M. Mabuchi, and K. Higashi, J. Mater. Res. 10, 133 (1995).
F. A. Mohamed and T. G. Langdon, Acta Metall. 23, 117 (1975).
R. C. Gifkins, Metall. Trans. A 7A, 1225 (1976).
S-A. Shei and T. G. Langdon, Acta Metall. 26, 639 (1978).
A. Arieli, A. K. S• Yu, and A. K, Mukherjee, Metall. Trans. A 11A, 181 (1980).
C. H. Hamilton, C. C. Bampton, and N. E. Paton, in Superplastic Forming of Structural Alloys, edited by N. E. Paton and C. H. Hamilton (The Metallurgical Society of AIME, San Diego, CA, 1982), p. 173.
I. Dutta, C. F. Tiedemann, and T. R. McNelley, Scripta Metall. Mater. 24, 1233 (1990).
M. A. Zaidi and T. Sheppard, Metal Sci. 16, 229 (1982).
T. Sheppard and M. G. Tutcher, Metal Sci. 14, 579 (1980).
F. J. Humphreys, Metal Sci. 13, 136 (1979).
F. J. Humphreys, Mater. Sci. Eng. A A135, 267 (1991).
T. Christman and S. Suresh, Acta Metall. 36, 1691 (1988).
H. Iwasaki, M. Takeuchi, T. Mori, M. Mabuchi, and K. Higashi, Scripta Metall. Mater. 31, 255 (1994).
K. Higashi and M. Mabuchi, Mater. Sci. Eng. A A176, 461 (1994).
K. Higashi, T. G. Nieh, and J. Wadsworth, Mater. Sci. Eng. A A188, 167 (1994).
R. Raj and M. F. Ashby, Acta Metall. 23, 653 (1975).
Aluminum Handbook, 4th ed. (Japan Inst, of Light Metals, Tokyo, Japan, 1990), p. 25.
D. J. Srolovitz, M. J. Luton, R. Petkovic-Luton, D. M. Barnett, and W. D. Nix, Acta Metall. 32, 1079 (1984).
V. C. Nardone, D. E. Matejczyk, and J. K. Tien, Acta Metall. 32, 1509 (1984).
M. N. Rahaman, Y. Boiteux, and L. C. D. Jonghe, Am. Ceram. Soc. Bull. 65, 1171 (1986).
S. M. Pickard, B. Derby, and E. A. Feest, J. Mater. Sci. 26, 6207 (1991).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Mabuchi, M., Higashi, K. Processing of high-strain-rate superplastic Si3N4w/Al–Mg–Si composites. Journal of Materials Research 10, 2494–2502 (1995). https://doi.org/10.1557/JMR.1995.2494
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.1995.2494