Abstract
The tensile flow behaviour in the range 275 to 550 ° C of an ultra-fine-grained superplastic Al-Ca-Zn alloy is reported. Under certain conditions of temperature and strain rate, superplastic ductility could be established. Fracture surfaces of tensile specimens tested in the above temperature range were examined by scanning electron microscopy and a correlation could be obtained between the ductility, as revealed by the tension tests, and the fracture behaviour. The fractographic studies also suggested a transition in the deformation process from grain deformation (mainly slip) at the lower temperatures to grain-boundary deformation (predominantly grain-boundary sliding) in the vicinity of 425 ° C.
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References
D. M. Moore andL. R. Morris,Mater. Sci. Engng 43 (1980) 85.
K. A. Padmanabhan, J. Hirsch andK. Lucke, unpublished work (1987).
P. P. Date, K. Swaminathan andK. A. Padmanabhan,J. Mater. Sci. 23 (1988) 1351.
K. A. Padmanabhan andG. J. Davies, “Superplasticity” (Springer Verlag, Berlin, Heidelberg and New York, 1980).
D. J. Lloyd andD. M. Moore, in Proceedings of the Conference on “Superplastic Forming of Structural Alloys”, edited by N. E. Paton and C. H. Hamilton, Metallurgical Society AIME, San Diego, 21–24 June (1982) (Metal Society AIME, Warrendale, Pennsylvania, 1982) pp. 161, 152.
R. K. Yadava andK. A. Padmanabhan,Mater. Sci. Engng 37 (1979) 127.
A. K. Ghosh, in Proceedings of the Symposium on “Superplastic Forming”, edited by S. P. Agrawal, American Society for Metals, Los Angeles Chapter, California, March (1984) (American Society Metals, Metals Park, Ohio, 1985) p. 147.
K. A. Padmanabhan, O. Engler, J. Hirsch andK. Lucke, personal communication (1988).
W. Qingling, M. Hongsen andM. Lungxiang, in Proceedings of the Conference on “Superplasticity in Aerospace Aluminium”, edited by R. Pearce and L. Kelly, Cranfield, UK, July (1985) (Ashford Press, Curdridge, England, 1985) p. 168.
P. Ramirez, F. G. Alday, H. E. Adabbo andO. A. Ruano,Mater. Sci. Engng 93 (1987) L11.
A. M. Hammad, PhD thesis, Institute of Technology, Banaras Hindu University (1978).
A. K. Ghosh,Trans. Amer. Soc. Met. 99 (1977) 264.
R. H. Van Stone, T. B. Cox, J. R. Low Jr andJ. A. Psioda,Int. Metall. Rev. 30 (1985) 157.
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Swaminathan, K., Padmanabhan, K.A. Tensile flow and fracture behaviour of a superplastic Al-Ca-Zn alloy. J Mater Sci 25, 4579–4586 (1990). https://doi.org/10.1007/BF01129909
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DOI: https://doi.org/10.1007/BF01129909