Abstract
Fine-grained structures were introduced in two commercial Al-based alloys (Al-1420: A1-5.5%Mg-2.2%Li-0.12%Zr; Supral: AI-6%Cu-0.4%Zr) by intense plastic straining using the Equal-Channel Angular (ECA) pressing technique. Mechanical testing was performed in the temperature range of 473–673 K and in the strain rate range of 10−4 -ls−1. Superplastic behaviour was observed, characterised by low flow stresses and very large elongation to failure. A maximum elongation of 1180% was obtained in Al-1420 at 623 K and 10−2 s−1 and 970% for Supral at 573 K and 10−2 s−1. The results are a significant improvement over earlier studies and this improvement is due to the presence of a homogeneous fine structure obtained through optimisation of the ECA pressing parameters. It is important to note that the fine microstructure in Al-1420 is thermally stable at these high testing temperatures.
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References
Langdon T.G. (1982) The mechanical properties of superplastic materials, Metall. Trans. A13, 689701
Higashi K. (1993) Positive exponent superplasticity in advanced aluminum alloys with nano or near- nano scale grained structures, Mater. Sci. Eng. A166, 109 - 118
Valiev R.Z. special editor (1996) Ultra-fine grained materials produced by severe plastic deformation, Annales de Chimie 21
Segal V.M. (1995) Materials processing by simple shear, Mater. Sci. Eng. A197, 157 - 164
Iwahashi Y., Wang J., Horita Z., Nemoto M. and Langdon T.G. (1996) Principle of equal-channel angular pressing for the processing of ultra-fine grained materials, Scripta Mater. 35, 143 - 146
Berbon P.B. (1997) internal report, University of Southern California
Iwahashi Y., Horita Z., Nemoto M. and Langdon T.G. (in press) An investigation of microstructural evolution during equal-channel angular pressing, Acta Mater.
Berbon P.B., Furukawa M., Horita Z., Nemoto M., Tsenev N.K., Valiev R.Z. and Langdon T.G. (1996) An investigation of the properties of an Al-Mg-Li-Zr alloy after equal-channel angular pressing, Mater. Sci. Forum 217-222, 1013 - 1018
Wang, J., Horita Z., Furukawa M., Nemoto M., Tsenev N.K., Valiev R.Z, Ma Y. and Langdon T.G. (1993) An investigation of ductility and microstructural evolution in an Al-3%Mg alloy with submicron grain size, J. Mater. Res. 8, 2810 - 2818
Furukawa M., Berbon P.B., Horita Z., Nemoto M., Tsenev N.K., Valiev R.Z. and Langdon T.G. (1997) Production of Ultrafine-Grained Metallic Materials Using an Intense Plastic Straining Technique, Mater. Sci. Forum 233, 177 - 184
Furukawa M., Berbon P.B., Horita Z., Nemoto M., Tsenev N.K., Valiev R.Z. and Langdon T.G. (1996) Structural evolution, ageing behavior and mechanical properties of an Al-Mg-Li-Zr alloy with ultra-fine grain size, Interface Science and Materials Interconnection, Y. Ishida et al., eds, The Japan Institute of Metals, Sendai, Japan, 479 - 482
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Berbon, P.B. et al. (1998). High Strain Rate Superplasticity in Fine-Grained Commercial Al Alloys Processed by Equal-Channel Angular Pressing. In: Ciach, R. (eds) Advanced Light Alloys and Composites. NATO ASI Series, vol 59. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9068-6_63
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DOI: https://doi.org/10.1007/978-94-015-9068-6_63
Publisher Name: Springer, Dordrecht
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