In Situ Mg₂Si Reinforced Mg Alloy Synthesized in Mg-SiO₂ System

Abstract:

The thermodynamic analysis in Mg-SiO2 system was conducted for the determination of the priority reaction at experimental temperature. Then, Mg2Si reinforced Mg alloy was synthesized through reaction in Mg-SiO2 system at 730°C, whose Si mass fraction is up to approximately 10%. The thermodynamic analysis and microstructure investigation results show, that generation of reinforcing phase of Mg2Si in Mg alloy from the reaction in Mg-SiO2 system is feasible with lower free energy than that in Mg-Si at the same temperature; and under the experimental temperature and solidification condition, the microstructure of Mg-10Si alloy is composed of coarse primary Mg2Si dendrite crystal, Chinese script type eutectic Mg2Si, and α–Mg phase, the formation of α–Mg holes is resulted from the relatively high cooling rate leading to a deviation from the equilibrium diagram during solidification.

• Periodical: Advanced Materials Research (Volumes 146-147)
• Pages: 1775-1779
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.146-147.1775
• Online since: October 2010
• Authors: Dan Huang, Yan Li Wang, Ying Wang, Hong Bao Cui, Xue Feng Guo
• Keywords: Mg Alloy, Mg₂Si, Mg-SiO₂, Reinforcement

References

[1] J. Zhang, Y.Q. Wang and B.L. Zhou: J Mater Res. Vol. 14(1999), p.68.

[2] L.H. Liao, X.Q. Zhang, H.W. Wang, X.Y. Qin, X.F. Li and N.H. Ma: J Alloys Compd. Vol. 430(2007), p.292.

[3] L. Lu, M.Q. Lai and M.L. Hao: Nanostruct Mater. Vol. 10(1998), p.551.

[4] G.Y. Yuan, M. Liu, W.J. Ding and I. Akihisa: Mater Sci Eng A, Vol. 357(2003), p.314.

[5] H.Y. Wang, Q.C. Jiang, B.X. Ma, Y. Wang, J.G. Wang and J.B. Li: J Alloys Compd. Vol. 387(2005), p.105.

[6] L. Wang and X.Y. Qin: Scripta Mater. Vol. 49(2003), p.243.

[7] J. Zhang, Z. Fan, Y.Q. Wang and B. L Zhou: Mater Sci Eng A. Vol. 281(2000), p.104.

[8] L. Wang, X. Qin and W. Xiong: Mater Sci Eng A, Vol. 459(2007), p.216.

[9] H. Wang, W. Wang and M. Zha: Mater Chem Phys. Vol. 108(2008), p.353.

[10] D. Tamura, R. Nagai and K. Sugimoto: Thin Solid Films, Vol. 515(2007), p.8272.

[11] A. Luo and M. Pekguleryuz: J Mater Sci. Vol. 29 (1994), p.5259.

[12] G.Y. Yuan, M.P. Liu, W. J Ding and I. Akihisa: Mater Sci Eng A. Vol. 357(2003), p.314.

[13] M.B. Yang, F.S. Pan, R.J. Cheng and W.L. Zhao: Rare Metal Materials and Engineering. Vol. 37(2008), p.1738 (in Chinese).

[14] Y.J. Liang and Y.C. Chen: Thermodynamic Data Handbook on Inorganic Substances (Dongbei University Press, China 1993) (in Chinese).

[15] J.Q. Yu, W.Z. Yi, B.D. Chen and H.J. Chen: Binary Phase Diagram (Shanghai Science and Technology, China 1984) (in Chinese).