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Licensed Unlicensed Requires Authentication Published by De Gruyter January 8, 2022

Processing map for hot working of hot-rolled Mg-11.5Li-1.5Al-0.15Zr alloy

O. Sivakesavam and Y. V. R. K. Prasad

Abstract

The hot working characteristics of the Mg-11.5Li-1.5Al-0.15Zr (wt.%) alloy have been studied using hot-compression testing in the temperature range 200– 400 °C and strain rate range 0.001– 100 s –1. On the basis of these data, a processing map for this material has been developed. The map exhibits a single domain with a peak efficiency of 53% occurring at 350 °C and 0.001 s– 1. On the basis of microstructural features, grain size variations and ductility variations, the domain is interpreted to represent dynamic recrystallization (DRX). Unlike in Zr-free alloy which exhibits only superplasticity, the Al3Zr particles in the Zr-containing alloy help in nucleating DRX and in refining the grain size. The material exhibits flow instabilities at temperatures higher than 350 °C and strain rates higher than 10 s– 1.


Dr. O. Sivakesavam Defence Metallurgical Research Laboratory Kanchanbagh (P.O), Hyderabad – 500 058, India Tel.: +91 40 434 5865 Fax: +91 40 434 5865/434 1439/434 0683

  1. One of the authors (O.S.) would like to thank Dr. D. Banerjee, Director, Defence Metallurgical Research Laboratory, Hyderabad, India for permission to publish this paper.

References

1 Singh, R.K.; Mishra, R.S: Scripta Metall. 24 (1990) 451.Search in Google Scholar

2 Prasad, Y.V.R.K.; Gegel, H.L; Doraivelu, S.M; Malas, J.C.; Morgan, J.T.; Lark, K.A.; Barker, D.R.: Met. Trans. A 15 (1984) 1883.Search in Google Scholar

3 Prasad, Y.V.R.K.; Seshacharyulu, T.: Int. Mater. Rev. 43 (1998) 243.Search in Google Scholar

4 Ziegler, H., in: Progress in Solid Mechanics, Vol. 4, North Holland, Amsterdam (1963) 93.Search in Google Scholar

5 Kalyan Kumar, A.K.S.: MSc Thesis, Indian Institute of Science, Bangalore (1987).Search in Google Scholar

6 Prasad, Y.V.R.K.: Indian Technol. 28 (1990) 435.Search in Google Scholar

7 Prasad, Y.V.R.K.; Sashidhara, S.: Hot Working Guide: A Compendium of Processing Maps, ASM International, Materials Park, OH (1997).Search in Google Scholar

8 Sivakesavam, O.; Prasad, Y.V.R.K.: Mat. Sci. Eng. A 323 (2002) 270.Search in Google Scholar

9 Sivakesavam, O.; Prasad, Y.V.R.K.: Z. Metallkd. 93 (2002) 123.Search in Google Scholar

10 Chakravarthy, J.K.; Prasad, Y.V.R.K.; Asundi, M.K.: Met. Trans. A 22 (1991) 829.Search in Google Scholar

11 Srinivasan, N.; Prasad, Y.V.R.K.: Mat. Sci. Technol. 8 (1992) 206.Search in Google Scholar

12 Ravichandran, N.; Prasad, Y.V.R.K.: Met. Trans. A 22 (1991) 2339.Search in Google Scholar

13 Ravichandran, N.; Prasad, Y.V.R.K.: Mat. Sci. Eng. A 156 (1992) 195.Search in Google Scholar

14 Couling, S.L.; Pashak, J.F.; Sturkey, L.: Trans. ASM 51 (1959) 94.Search in Google Scholar

Received: 2001-11-07
Published Online: 2022-01-08

© 2002 Carl Hanser Verlag, München