Microhardness, Microstructure and Electrochemical Efficiency of an Al--(Zn/xMg) Alloy After Thermal Treatment

J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (3): 255-260.

• Novel Processing and Characterization Methods • 上一篇下一篇

Microhardness, Microstructure and Electrochemical Efficiency of an Al--(Zn/xMg) Alloy After Thermal Treatment

Socorro,M.Suarez,O.A. Fregoso,J.A. Juárez-Islas

ICF-UNAM

收稿日期:2011-08-10 修回日期:2011-09-20 出版日期:2012-03-31 发布日期:2012-03-31
通讯作者: Socorro

Microhardness, Microstructure and Electrochemical Efficiency of an Al (Zn/xMg) Alloy after Thermal Treatment

Socorro Valdez¹⁾, M. Suarez²⁾, O.A. Fregoso²⁾, J.A. Juarez-Islas²⁾

1) Instituto de Ciencias Fsicas-UNAM, Av. Universidad S/N Col. Chamilpa, 062210, Cuernavaca, Morelos, Mexico
2) Instituto de Investigaciones en Materiales-UNAM, Circuito escolar S/N, Cd. Universitaria, 04515, Mexico, D.F., Mexico

Received:2011-08-10 Revised:2011-09-20 Online:2012-03-31 Published:2012-03-31
Contact: S. Valdez

摘要/Abstract

摘要： The influence of magnesium on the microhardness, microstructure and electrochemical efficiency of an Al(Zn/xMg) alloys has been investigated. Al(Zn/xMg) alloys were prepared by metal mould casting method in order to diminish the process cost and to generate an alloy with homogenous microstructure and less casting porosity. Vickers hardness, X-ray diffraction, scanning electron microscopy and transmission electron microscopy was performed to determine the magnesium influence on the AlZn alloy. Electrochemical efficiency was carried out in order to relate the influence of magnesium with the thermal treatment on the corrosion behavior of the Al(Zn/xMg) alloy. The results reveals the presence of Al32(MgZn)49 phase for two events; the first is when the magnesium content is upper to 5.49 % in as-cast condition and, the second after the thermal treatment carried out at 450 oC for 5 h. The results also show that the microhardness and electrochemical efficiency have been influenced by the presence of Al32(MgZn)49 phase. The addition of magnesium modifies the microstructure, increases the content of Al32(MgZn)49 phase and improves the electrochemical efficiency

Abstract: The influence of Mg on the microhardness, microstructure and electrochemical efficiency of Al(Zn/xMg) alloys have been investigated. Al(Zn/xMg) alloys were prepared by metal mould casting method to diminish the process cost and to generate an alloy with homogenous microstructure and less casting porosity. Vickers hardness, X-ray diffraction, scanning electron microscopy and transmission electron microscopy were performed to determine the Mg influence on the AlZn alloy. Electrochemical efficiency was used to relate the influence of Mg with the thermal treatment on the corrosion behavior of the Al(Zn/xMg) alloy. The results reveals the presence of Al₃₂(MgZn)₄₉ phase for two events; the first is when the Mg content is above 5.49% in as-cast condition, and the second after the thermal treatment is carried out at 450 ^oC for 5 h. The results also show that the microhardness and electrochemical efficiency have been influenced by the presence of Al₃₂(MgZn)49 phase. The addition of Mg modifies the microstructure, increases the content of Al₃₂(MgZn)₄₉ phase and improves the electrochemical efficiency.

Key words: Al(Zn/xMg) alloy, Microhardness, Electrochemical efficiency, Microstructures

Socorro M.Suarez O.A. Fregoso J.A. Juárez-Islas. Microhardness, Microstructure and Electrochemical Efficiency of an Al--(Zn/xMg) Alloy After Thermal Treatment[J]. J. Mater. Sci. Technol., 2012, 28(3): 255-260.

Socorro Valdez, M. Suarez, O.A. Fregoso, J.A. Juarez-Islas. Microhardness, Microstructure and Electrochemical Efficiency of an Al (Zn/xMg) Alloy after Thermal Treatment[J]. J Mater Sci Technol, 2012, 28(3): 255-260.

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Microhardness, Microstructure and Electrochemical Efficiency of an Al--(Zn/xMg) Alloy After Thermal Treatment

Microhardness, Microstructure and Electrochemical Efficiency of an Al (Zn/xMg) Alloy after Thermal Treatment

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