非晶增强铝基复合材料的微观结构及腐蚀性能

Microstructure and Corrosion Properties of Aluminum Matrix Composite Reinforced with Al-based Amorphous

利用扫描电镜(SEM)、透射电镜(TEM)及电化学腐蚀等测试手段对搅拌摩擦加工制备获得的新型非晶增强铝基复合材料的微观组织结构及腐蚀性能进行实验研究。实验结果表明,新型非晶增强铝基复合材料呈现典型的层状结构,且组织呈现一定的纳米级的超细晶结构,主要由α-Al及α-Al非晶结构组成的并伴有Al-Cu-Mg系析出相存在,与母材相比抗拉强度得到了较大的提高,而添加非晶形成的复合材料的电化学腐蚀性能相比未添加非晶基体材料加工后的腐蚀性能有所提高,但两种加工条件下材料的抗腐蚀性能均低于母材。

The microstructure and corrosion properties of a novel Al-based amorphous reinforced alu- minum matrix composite fabricated by friction stir processing （FSP） were studied by scanning electron microscope（SEM） ,transmission electron microscope（TEM） and electrochemical corrosion test meth- ods . The test results show that the composite exhibits the typical layered structure with a combina- tion of the base metal and the amorphous strip via the FSP, and shows a large amount of nanosized ul- trafine structure which are mainly composed of the a-A1 and a-A1 amorphous structure with A1-Cu-Mg series precipated phase existing in the composite. The tensile strength of composite is improved a lot compared with the base metal. The electrochemical corrosion behavior of the composite with amor- phous strip is also improved compared with that without amorphous strip, but, in both cases, the cor- rosion bebaviour is lower than the base metal.