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Excellent creep properties of Mg–Zn–Cu–Gd-based alloy strengthened by quasicrystals and Laves phases

Published online by Cambridge University Press:  01 May 2005

Guangyin Yuan*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China; and Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Hidemi Kato
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Kenji Amiya
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation,Sendai 982-0807, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A new type of Mg–Zn–Cu–Gd-based alloy strengthened by quasicrystal and Laves phase was developed. This alloy exhibits much better creep properties compared to AE42(Mg–4 wt% Al–2 wt% rare-earth) alloy, which is the benchmark creep-resistant magnesium die-casting alloy under the compressive creep condition of 180 °C and80 MPa. The new alloy also exhibits high room-temperature mechanical properties close to that of AZ91 alloy. The good mechanical properties are attributed to the special microstructure; the thermally stable icosahedral quasicrystals phase (i-phase) and Laves phase distributed along the grain boundary as a hard skeleton, and some fine β′1 precipitates distributed homogenously on the matrix. The dislocation morphology after the creep test was studied, and the strengthening mechanism was proposed.

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Articles
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1.Schumann, S. and Friedrich, H.: Current and future use of magnesium in the automobile industry. Mater. Sci. Forum 419–422, 51 (2003).CrossRefGoogle Scholar
2.Pekguleryuz, M.O. and Kaya, A.A.: Creep resistant magnesium alloys for powertrain applications. Adv. Eng. Mater. 5, 866 (2003).Google Scholar
3.Bettles, C.J. and Gibson, M.A.: Microstructural design for enhanced elevated temperature properties in sand-castable magnesium alloys. Adv. Eng. Mater. 5, 859 (2003).Google Scholar
4.Clark, J.B.: Age hardening in a Mg–9 wt% Al alloy. Acta Metall. 16, 141 (1968).CrossRefGoogle Scholar
5.Yuan, G., Amiya, K., Kato, H. and Inoue, A.: Structure and mechanical properties of cast quasicrystal-reinforced Mg–Zn–Al-Y base alloys. J. Mater. Res. 19, 1531 (2004).CrossRefGoogle Scholar
6.Pierce, F.S., Poon, S.J. and Guo, Q.: Electron localization in metallic quasicrystals. Science 261, 737 (1993).CrossRefGoogle ScholarPubMed
7.Halstead, A. and Rawlings, R.D.: The fracture behavior of two Co–Mo–Cr–Si wear resistant alloys (“Tribaloys”). J. Mater. Sci. 20, 1248 (1985).CrossRefGoogle Scholar
8.Wasikowska, A., Bartsch, M., Stein, F., Palm, M., Sauthoff, G. and Messerschmidt, U.: Plastic deformation of Fe-Al polycrystals strengthened with Zr-containing Laves phases, Part II. Mechanical Properties. Mater. Sci. Eng. A 381, 1 (2004).CrossRefGoogle Scholar
9.Elser, V.: Indexing problems in quasicrystal diffraction. Phys. Rev. B 32, 4892 (1985).CrossRefGoogle ScholarPubMed
10. ASTM X-Ray Powder Diffraction Data File 65-7003.Google Scholar
11.Liang, P., Seifert, H.J., Lukas, H.L., Ghosh, G., Effenberg, G. and Aldinger, F.: Thermodynamic modelling of the Cu–Mg–Zn ternary system. Calphad. 22, 527 (1998).CrossRefGoogle Scholar
12.Tsai, A.P., Niikura, A., Inoue, A., Masumoto, T., Nishita, Y., Tsuda, K. and Tanaka, M.: Highly ordered structure of icosahedral quasicrystals in Zn–Mg–RE (RE = rare earth metals) systems. Philos. Mag. Lett. 70, 169 (1994).CrossRefGoogle Scholar
13.Sturkey, L. and Clark, J.B.: Mechanism of age-hardening in magnesium-zinc alloys. J. Inst. Metals 88, 177 19591960.Google Scholar
14.Von Mises, R.: Mechanism of plastic deformation of crystal. Zeitschrift Für Ange Wandte Mechanik. 8, 161 (1928).Google Scholar