Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-28T03:30:50.112Z Has data issue: false hasContentIssue false
  • English
  • Français

Extraordinary Superplastic Ductility of Magnesium Alloy ZK60

Published online by Cambridge University Press:  01 June 2005

R. Lapovok ,
R. Cottam ,
P.F. Thomson  and
Y. Estrin
R. Lapovok*
Affiliation:
School of Physics and Materials Engineering, Monash University, Victoria 3800, Australia
R. Cottam
Affiliation:
School of Physics and Materials Engineering, Monash University, Victoria 3800, Australia
P.F. Thomson
Affiliation:
School of Physics and Materials Engineering, Monash University, Victoria 3800, Australia
Y. Estrin
Affiliation:
Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, 38678 Clausthal-Zellerfeld, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

Exceptionally high tensile ductility of commercial Mg alloy ZK60 is reported. It was achieved by equal channel angular pressing without any extra processing steps. The tensile ductility at 220 °C was 2040% and 1400% for the strain rates of 3 × 10−4 s−1 and 3 × 10−3 s−1, respectively. The strain rate sensitivity of the flow stress exhibited a value slightly above 0.5, which is characteristic of superplastic deformation. The grain structure associated with this behavior was shown to be bi-modal with further separation in two fractions with different grain sizes within the small grain size population.

Keywords

MicrostructureSuperplasticityTransmission electron microscopy (TEM)
Type
Rapid Communications
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1375 - 1378
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Backofen, W.A., Azzarto, F.J., Murty, G.S. and Zehr, S.W. Ductility, in Superplasticity (ASM, Metal Park, OH, 1967), pp. 279–310.Google Scholar
2Bussiba, A., Artzy, A. Ben and Shtechman, A.: Grain refinement of AZ31 and ZK60 Mg alloys: Towards superplasticity studies. Mater. Sci. Eng. A 302, 56 (2001).CrossRefGoogle Scholar
3Watanabe, H., Mukai, T. and Higashi, K.: Superplasticity in ZK60 magnesium alloy at low temperatures. Scripta Mater. 40, 477 (1999).CrossRefGoogle Scholar
4Mabuchi, M., Nakamura, M., Ameyama, K., Iwassaki, H. and Higashi, K. Superplastic Behaviour of Magnesium Alloy Processed by ECAE, Materials Science Forum (Trans Tech Publications, Switzerland, 1999), Vol. 304–306, pp. 67–72.Google Scholar
5Watanabe, H., Mukai, T., Ishikawa, K. and Higashi, K. Superplastic Behaviour of an ECAE Processed ZK60 Magnesium Alloy, Materials Science Forum (Trans Tech Publications, Switzerland, 2003), Vols. 419–422, pp. 557–562.Google Scholar
6Galiev, A. and Kaibyshev, R.: Superplasticity in magnesium alloy subjected to isothermal rolling. Scripta Mater. 51, 89 (2004).CrossRefGoogle Scholar
7Chuvil’deev, V.N., Nieh, T.G., Gryaznov, M.Yu., Sysoev, A.N. and Kopylov, V.I.: Low-temperature superplasticity and internal friction in microcrystalline Mg alloy processed by ECAP. Scripta Mater. 50, 861 (2004).CrossRefGoogle Scholar
8Agnew, R.C., Lillo, T.M., Macheret, J., Stoica, G.M., Chen, Y. Lu, Fielden, D. and Liaw, P.K. Assessment of ECAE processing of magnesium alloys, in Magnesium Technology, edited by Hryn, J.N. (TMS, Warrendale, PA, 2001), pp. 243–247.Google Scholar
9Matsubara, K., Miyahara, Y., Horita, Z. and Langdon, T.G.: Developing superplasticity in a magnesium alloy through a combination of extrusion and ECAP. Acta Mater. 51, 3073 (2003).CrossRefGoogle Scholar
10Padmanabhan, K.A., Vasin, R.A. and Enikeev, F.U.: Superplastic Flow: Phenomenology and Mechanics (Springer-Verlag, Berlin, Germany, 2001).CrossRefGoogle Scholar
11Valiev, R.Z., Alexandrov, I.V., Zhu, Y.T. and Lowe, T.C.: Paradox of strength and ductility in metals processed by severe plastic deformation. J. Mater. Res. 17, 5 (2002).CrossRefGoogle Scholar
12Lapovok, R., Thomson, P.F., Cottam, R. and Estrin, Y.: The effect of warm equal channel angular extrusion on ductility and twinning in magnesium alloy ZK60. Mater Trans. 45, 2192 (2004).CrossRefGoogle Scholar
13Wang, Y.M., Chen, M.W., Zhou, F.H. and Ma, E.: High tensile ductility in a nonostructured metal. Nature 419, 912 (2002).CrossRefGoogle Scholar
14Watanabe, H., Moriwaki, K., Mukai, T., Ohsuna, T. and Higara, K.: Materials processing for structural stability in as ZK60 magnesium alloy. Mater. Trans. 44, 775 (2003).CrossRefGoogle Scholar
15Valiev, R.: Nanostructuring of metals by severe plastic deformation for advanced properties. Nat. Mater. 3, 511 (2004).CrossRefGoogle ScholarPubMed