锻压技术

Zn作中间层的镁铝复合材料挤压成形微观组织与力学性能研究

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

作者：乔及森李晓艳夏宗辉

单位：兰州理工大学

关键词：正向热挤压镁铝复合材料 AZ31镁合金 AA6060铝合金微观组织力学性能

分类号：TG379；TG146.2

出版年,卷(期):页码：2019,44(7):144-149

摘要：

在360 ℃下，采用正向挤压成形方式，将不同几何尺寸配合下的AA6060铝合金和AZ31镁合金坯料挤压形成棒材；并选择挤压成形质量较好的配合坯料，在Al/Mg接触面添加厚度为150 μm的Zn箔作为中间层，进行挤压试验。挤压完成后，分别使用光学显微镜（OM）、扫描电子显微镜（SEM）、能谱分析（EDS）技术对镁铝复合材料界面结合处进行分析，发现添加Zn箔作为中间层的镁铝合金进行正向挤压时，结合界面主要形成了Zn3Mg7、AlMg4Zn11和Mg32(Al,Zn)49 3种相，避免了挤压时生成Mg-Al系脆性相，使得结合界面的显微硬度降低，有利于包覆铝合金层结合界面强度的提高。

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.

基金项目：

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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