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m-δ Relationship and Structural Evolution during a Constant Strain-Rate Superplastic Deformation of an Aluminum Alloy

Published online by Cambridge University Press:  16 February 2011

Shanyou Zhou ,
Dongming Zhang ,
Dongliang Lin  and
T. L. Lin
Shanyou Zhou
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai, 200030, P. R. China
Dongming Zhang
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai, 200030, P. R. China
Dongliang Lin
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai, 200030, P. R. China
T. L. Lin
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai, 200030, P. R. China
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Abstract

At 515° C with a constant strain-rate of 6.7× 10−3 min−1,tensile specimen of LC4 aluminum alloy with an initial average grain size of 8.7μm exhibited good superplasticity. A fracture elongation of 4649% was obtained. Under such deformation conditions, the m-δrelationship belongs to the mL=mmax type , with a maximum m value of 0.78 at 94% strain. The m-δ relationship can be expressed as δI(%)= (CI ×0.0067(mI−0.5) −1) × 100. During superplastic deformation, three kinds of structural evolution take place, namely the formation of precipitate-free zones adjacent to grain boundaries due to diffusional creep, grain coarsening and cavity generation. The m-δ relationship of superplasticity of the alloy mentioned above can be explained on the basis of the structural evolution during superplastic deformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 196: Symposium T – Superplasticity in Metals, Ceramics, and Intermetallics , 1990 , 227
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Backofen, W.A., Turner, I.R., and Avery, D.H., Trans. ASH. 57,980 (1964).Google Scholar
2. Woodford, D.A., Trans. ASH. 62,537 (1969).Google Scholar
3. Liu, C., Metall. Trans. A. 17A,685 (1986).Google Scholar
4. Liu, C., Metall. Trans. A. 17A,679 (1986).Google Scholar
5. Karim, A., in Ultrafine-grain metals, edited by Burke, J.J. and Weiss, V. (Syracuse University Press, 1970), p.295.Google Scholar
6. Squires, R.L., Weiner, R.T., and Phillips, M., J.Nucl. Mat. 8,77 (1963).Google Scholar
7. Taplin, D.M.R., Dunlop, G.L., and Langdon, T.G., Ann. Rev. Hater. Sci. 9,151 (1979).Google Scholar
8. Kenji, Matuki, Yasuhide, Ueno, and Masao, Yamada J.Jap. Inst. Met. 3,219 (1974).Google Scholar
9. Jonas, J.J. and Baudelet, B., Acta Met. 25,43 (1977).Google Scholar