Transactions of Materials and Heat Treatment

Title：Study on microstructure and mechanical properties of extrusion for magnesium-aluminum composite with Zn as intermediate layer

Authors： Qiao Jisen Li Xiaoyan Xia Zonghui

Unit： Lanzhou University of Technology

KeyWords： forward hot extrusion magnesium-aluminum composite AZ31 magnesium alloy AA6060 aluminum alloy microstructure mechanical properties

ClassificationCode：TG379；TG146.2

year,vol(issue):pagenumber：2019,44(7):144-149

Abstract：

The AA6060 aluminum alloy and the AZ31 magnesium alloy blanks with different geometrical dimensions were extruded into bars at 360 ℃ by forward extrusion method, and the extrusion blanks with good extrusion quality were selected. Then, the Zn foil with thickness of 150 μm as an intermediate layer was added to the Al/Mg bonding interface, and the extrusion tests were conducted. After the extrusion, the bonding interface of magnesium-aluminum composite was analyzed by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It is found that when the magnesium-aluminum alloy with Zn foil as the intermediate layer is processed by forward extrusion, the bonding interface mainly formes three phases of Zn3Mg7, AlMg4Zn11 and Mg32(Al, Zn)49, which avoides the formation of Mg-Al brittle phase during the extrusion process. Therefore, the micro-hardness in the bonding interface reduces, and the strength in the bonding interface of coated aluminum alloy layer is improved effectively.

Funds：

国家自然科学基金资助项目（51665033）；甘肃省中小企业创新基金（17CX2JA026）

乔及森（1973-），男，博士，教授，E-mail：qiaojisen@lut.cn

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