Microstructure and Compression Deformation Behavior in the Quasicrystal-Reinforced Mg-6Zn-2Y Alloy Solidified under Super-High Pressure at Room-Temperature

Abstract:

The microstructures of the Mg-6Zn-2Y alloy solidified under high pressures were investigated using scanning electronic microscopy (SEM) and X-ray diffraction (XRD). The room-temperature compression behavior was analyzed through experiments, showing that the microstructures of the alloys are consisted of α-Mg and quasicrystal I-Mg3Zn6Y phases. With solidification pressure increasing, the microstructures were refined, and the morphologies of the inter-dendritic secondary phase were improved from continuous networks into long-island and granule. The compression strength, yielding strength and compressibility were increased significantly corresponding with solidification pressure, from 259.02 MPa, 230.39 MPa and 18.3% under ambient pressure to 361.43 MPa, 272.25 MPa and 33.1% under high pressure of 6 GPa. The cleavage planes are flat, and the cleavage steps are straight under ambient pressure. However, the cleavage planes are small and rough under 4-6 GPa; tearing dimples occur in the tearing area, indicating that the degree of cleavage fracture decreases under high pressure.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 311-314
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.311
• Online since: February 2014
• Authors: Xiu Mei Han, Yun Dong, Tian Bo Zhao, Xiao Ping Lin, Jing Luo, Hui Guang Yang
• Keywords: Compression Behavior, Mg-6Zn-2Y Alloy, Microstructure, Super-High Pressure Solidification

References

[1] H. Somekawa, H. Watanabe, T. Mukai. Materials Letters Vol. 65 (21 - 22)( 2011), p.3251.

[2] She Chtman D, Lang C. Project of NIST National Institute of standards and Technology-High specific strength magnesi-um alloy produced by RSP[R], (1999).

[3] J. Y. Lee, D. H. Kim, H. K. Lim, D. H. Kim. Mater Lett, Vol59 (29 - 30)(2005), p.3801.

[4] H. Somekawa, A. Singh, T. Mukai. Advanced Engineering Materials Vol 11(2009) p.782.

[5] a J. Tong, H. Huang, G. Y. Yuan, W. J. Ding. Acta metallurgica Sinica. Vol 47(12) (2011) p.1520.

[6] X. F. Guo: fine crystal magnesium alloy preparation method and the microstructure and properties of [M]. (Beijing: Metallurgical Industry Press, 2010: 77-89).

[7] In Badishefu. Crystalline [M]. (Harbin Institute of Technology press, metal and alloy under pressure, 1987: 23).

[8] Y. D. Qu, R. D. Li, X. G. Yuan, C. X. Li, Q. C. Xiang. Foundry Vol54 (6)(2005), p.539.

[9] B. Li, H. W. Wang, J. C. Jie, Z. J. Wei. Journal of Alloys and Compounds Vol509 (7)(2011), p.3387.

[10] B. Li, H. W. Wang, J. C. Jie, Z. J. Wei. Materials & design Vol32 (3) (2011), p.1617.

[11] X. P. Lin, Y. Dong, R. Xu, G. F. Sun, S. H. Jiao. Acta Metallurgica Sinica Vol 47 (12) (2011) p.1550.