Effects of Hot Extrusion and Aging on Microstructure and Mechanical Properties of Mg-Zn-Si-Ca Magnesium Alloy

Abstract:

Article Preview

Homogenized magnesium alloy Mg-6Zn-Si-0.25Ca has been hot-extruded and then aging treated for improving the magnesium alloy plastic deformation ability and promoting applications of magnesium alloys. In the hot extrusion process, the influences of extrusion parameters for microstructures and mechanical properties of Mg-6Zn-Si-0.25Ca magnesium alloy were investigated. The results show that dynamic recrystallization occurred during hot extrusion. Compared with as-cast alloy, the grains are fined remarkably, and the mechanical properties are enhanced obviously. Twin crystals appeared in grains after hot extrusion, with the extrusion temperature rising, twin crystal structures has been reduced. Aging further increased the mechanical properties of the estruded alloy. The ultimate tensile strength of Mg-6Zn-Si-0.25Ca alloy is about 385 MPa and the elongation is about 11% when extruded at 320°C(extrusion ratio is 10) and aged at 190°C for 8h.

Info:

Periodical:

Edited by:

David M. Batisdas and Y.Q. Chang

Pages:

823-829

Citation:

X. Q. Zhang et al., "Effects of Hot Extrusion and Aging on Microstructure and Mechanical Properties of Mg-Zn-Si-Ca Magnesium Alloy", Advanced Materials Research, Vol. 668, pp. 823-829, 2013

Online since:

March 2013

Export:

Price:

$41.00

[1] PAN F S, HAN E H, et al: High-performance wrought magnesium alloys and processing technology. Science Press, China, BJ, (2007).

[2] DING W J, et al: Magnesium alloy Science and Technology. Science and Technology Press, China, BJ, (2007).

[3] ZHANG J, ZHANG Z H, et al: Magnesium alloy and application. Chemical Industry Press, China, BJ, (2007).

[4] CHEN Z H, et al: Heat-resistant magnesium alloy. Chemical Industry Press, China, BJ, (2006).

[5] SONG H N, YUAN G Y, WANG Q D, et al: Microstructure and mechanical properties of the heat-resistant alloy of Mg-Zn-Si-Ca. Chinese Journal of Nonferrous Metals, China, 2002, 12 (5): 956-970.

[6] YANG X Y, ZHANG L: Twins and twins in magnesium alloy at cross. Metal journal, China, 2009, 45 (11): 1303-1308.

[7] LI S B, ZOU Z W, WU K, et al: AZ91D magnesium alloy high temperature compression process of microstructure evolution. Chinese Journal of Nonferrous Metals, China, 2007, 17 (7): 1041-1045.

[8] Myshlyaev M M, McQueen H J, Mwembela A, Konopleva E. Twinning: Dynamic recovery and recrystallization in hot worked Mg-Al-Zn alloy. Materials and Engineering A, 2002, 337: 121.

DOI: https://doi.org/10.1016/s0921-5093(02)00007-2

[9] WANG Z X, XIE J X, LIU X F, et al: Deformation and aging on the microstructure and mechanical properties of AZ91 magnesium alloy. Metal journal, 2007, 43 (9): 920-924.

[10] YU K, LI W X, WANG R C: The impact of the heat treatment process of ZK60 magnesium alloy microstructure and mechanical properties. Chinese Journal of Nonferrous Metals, China, 2007, 17 (2): 188-192.

[11] CUI Z X, TAN Y C: Metallurgy and Heat Treatment, Machinery Industry Press, China, (2007).

[12] CHEN Z H: Wrought Magnesium Alloy. Chemical Industry Press, China, BJ, (2005).

[13] GAO X, NIE J F: Characterization of strengthening precipitate phases in a Mg-Zn alloy. Scripta Materialia, 2007(56): 645−48.

DOI: https://doi.org/10.1016/j.scriptamat.2007.01.006

[14] BUHA J: Characterisation of precipitates in an aged Mg-Zn-Ti alloy. Journal of Alloys and Compounds, 2009(472): 171−177.

DOI: https://doi.org/10.1016/j.jallcom.2008.05.019