Study on Microstructure and Properties of Mg-9Al-xZn Alloys


Article Preview

Some Zn and a little Ag are added into ZM5 magnesium alloy (one of Mg-9 wt%Al-1 wt%Zn alloys in China), and the differences of the microstructures and properties between the new alloy and ZM5 is investigated. Effects of heat treatment and alloying elements (Zn and Ag) on the microstructure and tensile properties of Mg-9Al-xZn alloys, and relationships between the chemical composition, microstructure and properties are investigated. Zn ad Ag have obvious solid solution strengthening effects on Mg-9Al-xZn alloy, while Ag is detrimental to the corrosion resistance after being artificial aged. The morphology of pearlite-like secondary γ(Mg17Al12) phase (γII) has close relation with the properties.



Materials Science Forum (Volumes 475-479)

Main Theme:

Edited by:

Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie




X. Y. Zhang et al., "Study on Microstructure and Properties of Mg-9Al-xZn Alloys", Materials Science Forum, Vols. 475-479, pp. 477-480, 2005

Online since:

January 2005




[1] S. Celotto, TEM Study of Continuous Precipitation in Mg-9 wt%Al-1 wt%Zn Alloy, Acta Mater., 2000, 48: 1775-1787.


[2] LE Qichi, OU Peng, WU Yuedong, et al., Study on the Near-Liquidus Casting of AZ91D Magnesium Alloy, Acta Metall. Sin., 2002, 38(2): 219~224 (in Chinese).

[3] YUAN Xiaoguang, LIU Zheng, XU Yi, Effect of electromagnetic cast on microstructures and mechanical properties of AZ91D alloy, The Chinese Journal of Nonferrous Metals, 2002, 12(4):784~790 (in Chinese).

[4] A. F. Crawley and B. Lagowski, Effect of Two-Step Aging on the Precipitate Structure in Magnesium Alloy AZ91, Metall. Trans., 1974, 5: 949~951.


[5] D. Duly, J.P. Simon and Y. Brechet, On the competition between continuous and discontinuous precipitations in binary Mg-Al alloys, Acta Metall. Mater., 1995, 43(1): 101~106.


[6] A. F. Crawley and K. S. Milliken, Precipitate Morphology and Orientation Relationships in an Aged Mg-9%Al-1%Zn-0. 3%Mn Alloy, Acta Metall., 1974, 22: 557~562.


[7] XIAO Xiaoling, LUO Chengping, NIE Jianfeng, et al., Morphology and Crystallography of β-(Mg17Al12) precipitate in an AZ91 Magnesium-Aluminum Alloy, Acta Metall. Sin., 2001, 37(1): 1~7 (in Chinese).

[8] LUO Chengping, XIAO Xiaoling, LIU Jiangwen, et al., Multi-orientation Relationship and {112}γ Pseudo-twin Relationship of γ-Mg17Al12 precipitates in an AZ91 Mg-Al Alloy, Acta Metall. Sin., 2002, 38(7): 709~714 (in Chinese).

[9] XIAO Xiaoling, LUO Chengping, LIU Jiangwen, et al., Structure of HCP/BCC interphase boundaries in AZ91 Mg-Al alloy, The Chinese Journal of Nonferrous Metals, 2003, 13(1): 15~20 (in Chinese).