Instable Plasticity and Precipitation in AZ91D Magnesium

Abstract:

Instable plasticity, which is normally a consequence of interactions between diffusing solute atoms and dislocations, is observed in AZ91D magnesium at room temperature. Experimental measurements of different heat treatment of AZ91D magnesium were taken to investigate different influence on PLC effect by the presence and structural state of second phase in this study. Tensile specimens were tested at room temperature at a crosshead speed of 0.6 mm/min. The results indicate that some number of large,coherent precipitates prevents serrated flow by way of trapping vacancies, but small precipitates content do not supress it.

• Periodical: Advanced Materials Research (Volumes 129-131)
• Pages: 828-832
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.129-131.828
• Online since: August 2010
• Authors: Shao Feng Zeng, Wen Zhe Chen
• Keywords: AZ91D Magnesium, Instable Plasticity, Precipitation, Serrated Flow

References

[1] P. Hahner: Acta. Mater, Vol. 45(1997), P. 3695.

[2] D. Thevenet, M. Mliha-Touati and A. Zeghloul: Mater. Sci. Eng. A Vol. 266(1999), P. 175.

[3] E. Pink, J. Krol: Acta. Mater, Vol. 43(1995), p.2351.

[4] Q. Chen, X.Y. Liu and S.B. Biner: Acta Metall. Vol. 56 (2008).

[5] M.A. Soare, W.A. Curtin: Acta. Mater, Vol. 56 (2008), p.4046.

[6] E. Pink, S. Kumar and B. Tian: Mater. Sci. Eng. A Vol. 280 (2000) , p.17.

[7] S . Kumar, H.B. McShane: Scripta Metall. Mater. Vol. 28(1993), p.1149.

[8] D. Thevenet, M. Mliha-Touati and A. Zeghloul: Mater. Sci. Eng. A Vol. 266 (1999) , p.175.

[9] E. Pink, Acta Metall. Vol. 37 (1989), p.1773.

[10] P.G. McCormick, Acta Metall. Vol. 19 (1971), p.463.

[11] Y. Brechet, Y. Estrin, Acta. Metall. Mater. Vol. 43 (1995), p.955.