Abstract
Al-Cu alloys containing 6, 11, 17, 24 and 33 wt% Cu, annealed for 0.5–100 h, were deformed by the differential strain-rate test technique over a strain-rate range of ≈4×10−6 to 3×10−2s−1 at temperatures ranging from 460–540°C. Superplastic behaviour, with strain-rate sensitivity, m≈0.5, and activation energy, Q=171.5 kJ mol−1, is shown by the Al-24Cu and Al-33Cu alloys at lower strain rates and higher temperatures. All the alloys show m≲0.20 at higher strain rates, but the average activation energy for deformation of the Al-6Cu, Al-11Cu, and Al-17Cu alloys is evaluated to be 480.7 kJ mol−1, in contrast to a lower value of 211 kJ mol−1 for the Al-24Cu and Al-33Cu alloys. Instead of grain size, the mean free path between θ particles is suggested to be a more appropriate microstructural parameter for the constitutive relationship for deformation of the Al-Cu alloys.
Similar content being viewed by others
References
A. K. Mukherjee, J. E. Bird and J. E. Dorn, Trans. ASM 62 (1969) 155.
J. W. Edington, K. N. Melton and C. P. Cutler, Prog. Mater. Sci. 21 (1976) 61.
M. Suéry and B. Baudelet, Res. Mech. 2 (1981) 163.
M. Kobayashi and M. Miyagawa, Trans. ISIJ 27 (1987) 685.
D. L. Holt and W. A. Backofen, Trans. ASM 59 (1966) 755.
M. J. Stowell, J. L. Robertson and B. M. Watts, Metal Sci. J. 3 (1969) 41.
R. D. Schmidt-Whitley, Z. Metallkd 64 (1973) 552.
G. Rai and N. J. Grant, Metall. Trans. 6A (1975) 385.
K. A. Padmanabhan and G. J. Davies, Metal Sci. 11 (1977) 177.
Y. Kobayashi, Y. Ishida and M. Kato, Scripta Metall. 11 (1977) 51.
N. Furushiro and S. Hori, ibid. 12 (1978) 35.
G. A. Nassef, M. Suery and El-Ashram, Metals Techno. 9 (1982) 355.
B. P. Kashyap and K. Tangri, Metall. Trans. 181A (1987) 417.
E. Sato, K. Kuribayashi and R. Horiuchi, J. Jpn Inst. Metals 53 (1989) 885.
A. H. Chokshi and T. G. Langdon, Mater. Sci. Technol. 5 (1989) 435.
J. R. Cahoon, Metal Sci. 9 (1975) 346.
P. K. Chaudhury and F. A. Mohamed, Mater. Sci. Eng. A 101 (1988) 13.
G. S. Sohal, Mater. Sci. Technol. 4 (1988) 811.
P. K. Bakshi and B. P. Kashyap, J. Mater. Sci. 29 (1994) 2063.
B. I. Edelson and W. M. Baldwin, Trans. ASM 55 (1962) 230.
M. F. Ashby, Z. Metallkd 55 (1964) 5.
C. W. Corti, P. Cotterill and G. A. Fitzpatrick, Int. Metall. Rev. 19 (1974) 77.
A. G. Guy, “Elements of physical metallurgy,” 2nd Edn. (Addison-Wesley, Reading, MA, 1959) p. 297.
D. W. Livesey and N. Ridley, J. Mater. Sci. 27 (1982) 2257.
T. Chanda and G. S. Murty, ibid. 27 (1992) 5931.
E. O. Hall, Proc. Phys. Soc., Lond. B64 (1951) 747.
N. J. Petch, J. Iron Steel Inst. 174 (1953) 25.
D. Dew-Hughes and W. D. Robertson, Acta Metall. 8 (1960) 147.
P. K. Bakshi and B. P. Kashyap, Scripta Metall. Mater. 29 (1993) 1073.
B. A. Movchan, Mater. Sci. Eng. A138 (1991) 109.
O. D. Sherby and J. Wadsworth, Prog. Mater. Sci. 33 (1989) 169.
S. Hori, N. Furushiro and S. Kawaguchi, J. Jpn Inst. Light Metals 25 (1975) 361.
T. H. Courtney, “Mechanical behaviour of materials”, (McGraw-Hill, Singapore, 1990) p. 193.
E. Ho and G. C. Weatherly, Acta Metall. 23 (1975) 1451.
E. A. Brandes (ed.), “Smithells metals reference book”, 6th Edn (Butterworths, London, 1983) p 13.9.
J. Cadek, “Creep in metallic materials”, 1st Edn. (Elsevier, Amsterdam, 1988) pp. 115, 176.
A. W. Thompson, Metall. Trans. 8A (1977) 833.
O. D. Sherby, R. H. Klundt and A. K. Miller, ibid. 8A (1977) 843.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bakshi, P.K., Kashyap, B.P. Stress-strain rate relations for high-temperature deformation of two-phase Al-Cu alloys. JOURNAL OF MATERIALS SCIENCE 30, 5065–5072 (1995). https://doi.org/10.1007/BF00356050
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00356050