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Mechanical properties of AZ31 Mg alloy recycled by severe deformation

Published online by Cambridge University Press:  01 March 2006

Yasumasa Chino*
Affiliation:
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama-ku, Nagoya 463-8560, Japan
Tetsuji Hoshika
Affiliation:
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama-ku, Nagoya 463-8560, Japan
Jae-Seol Lee
Affiliation:
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama-ku, Nagoya 463-8560, Japan
Mamoru Mabuchi*
Affiliation:
Department of Energy Science & Technology, Graduate School of Energy Science, Kyoto University, Yoshidahonmachi, Sakyo-ku, Kyoto 606-8501, Japan
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

AZ31 Mg machined chips were recycled by extrusion at 673 K with a low extrusion ratio of 45:1 and a high extrusion ratio of 1600:1. Oxide contaminants were dispersed more uniformly in the recycled specimen with the high extrusion ratio than in that with the low extrusion ratio. In tensile tests, the recycled specimens with the high extrusion ratio showed about 50% higher 0.2% yield stress and about 20% higher tensile strength compared with those of the reference specimens, which were the extruded AZ31 Mg blocks under the same conditions as the recycled specimens. The improvement of the tensile properties was attributed not only to the small grain size, but also to the dispersed oxide contaminants.

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Articles
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

1.Ebert, T., Mordike, B.L.: Magnesium properties—applications—potential. Mater. Sci. Eng. A302, 37 (2001).Google Scholar
2.King, J.F., Hopkins, A., Thistlethwaite, S. Recycling of by-products from magnesium diecasting, in Proc. Third International Magnesium Conference, edited by Lorimer, G.W. (The University Press Cambridge, Cambridge, England, 1997), p. 51.Google Scholar
3.Mabuchi, M., Kubota, K., Higashi, K.: New recycling process by extrusion for machined chips of AZ91 magnesium and mechanical properties of extruded bar. Mater. Trans. JIM 36, 1249 (1995).CrossRefGoogle Scholar
4.Watanabe, H., Moriwaki, K., Mukai, T., Ishikawa, K., Kohzu, M., Higashi, K.: Consolidation of machined magnesium alloy chips by hot extrusion utilizing superplastic flow. J. Mater. Sci. 36, 5007 (2001).CrossRefGoogle Scholar
5.Kondoh, K., Luangvaranunt, T., Aizawa, T.: Solid-state recycling of AZ91D magnesium alloy chips. J. Jpn. Inst. Light Metals 51, 516 (2001).CrossRefGoogle Scholar
6.Chino, Y., Kishihara, K., Shimojima, K., Hosokawa, H., Yamada, Y., Wen, C.E., Iwasaki, H., Mabuchi, M.: Superplasticity and cavitation of recycled AZ31 magnesium alloy fabricated by solid recycling process. Mater. Trans. 43, 2437 (2002).CrossRefGoogle Scholar
7.Chino, Y., Kobata, M., Shimojima, K., Hosokawa, H., Yamada, Y., Iwasaki, H., Mabuchi, M.: Blow forming of Mg alloy recycled by solid-state recycling. Mater. Trans. 45, 361 (2004).CrossRefGoogle Scholar
8.Aida, T., Takatsuji, N., Matsuki, K., Kamado, S., Kojima, Y.: Homogeneous consolidation process by ECAP for AZ31 cutting chips. J. Jpn. Inst. Light Metals 54, 532 (2004).CrossRefGoogle Scholar
9.Alves, H., Koster, U., Aghion, E., Eliezer, D.: Environmental behavior of magnesium and magnesium alloys. Mater. Technol. 16, 110 (2001).CrossRefGoogle Scholar
10.Chino, Y., Iwasaki, H., Mabuchi, M.: Solid state recycling for machined chips of iron by hot extrusion and annealing. J. Mater. Res. 19, 1524 (2004).CrossRefGoogle Scholar
11.Yin, D.L., Zhang, K.F., Wang, G.F., Han, W.B.: Warm deformation behavior of hot-rolled AZ31 Mg alloy. Mater. Sci. Eng. A392, 320 (2005).CrossRefGoogle Scholar
12.Armstrong, R., Codd, I., Douthwaite, R.M., Petch, N.J.: The plastic deformation of polycrystalline aggregates. Philos. Mag. 7, 45 (1962).CrossRefGoogle Scholar
13.Wang, Z.C., Prangnell, P.B.: Microstructure refinement and mechanical properties of severely deformed Al–Mg–Li alloys. Mater. Sci. Eng. A328, 87 (2002).CrossRefGoogle Scholar
14.Humphreys, F.J.: A unified theory of recovery, recrystallization and grain growth based on the stability and growth of cellular microstructures—II. The effect of second-phase particles. Acta Mater. 45, 5031 (1997).CrossRefGoogle Scholar
15.Mabuchi, M., Higashi, K.: Strengthening mechanisms of Mg–Si alloys. Acta Mater. 44, 4611 (1996).CrossRefGoogle Scholar
16.Aikin, R.M. Jr.Christodoulou, L.: The role of equiaxed particles on the yield stress of composites. Scripta Metall. 25, 9 (1991).CrossRefGoogle Scholar
17.Luster, J.W., Thumann, M., Baumann, R.: Mechanical properties of aluminum alloy 6061–Al2O3 composites. Mater. Sci. Technol. 9, 853 (1993).CrossRefGoogle Scholar
18.Barnett, M.R.: A Taylor model based on description of the proof stress of magnesium AZ31 during hot working. Metall. Mater. Trans. A 34, 1799 (2003).CrossRefGoogle Scholar
19.Magnesium and Magnesium Alloys, ASM Specialty Handbook, edited by Avedesian, M.M. and Baker, H. (ASM International, The Materials Information Society, Materials Park, OH, 1999), p. 258.Google Scholar
20.Frost, H.J., Ashby, M.F.: Deformation-Mechanism Maps (Pergamon Press, Oxford, UK, 1982), p. 44.Google Scholar
21.Ceramics Dictionary, edited by The Ceramics Society of Japan (Maruzen, Tokyo, Japan, 1997), p. 556 (in Japanese).Google Scholar