摘要
通过固液复合法实现了电弧喷涂铝涂层与AZ91D镁合金基体之间的结合,并对结合界面的组织、元素和相组成进行了分析。结果表明:对涂层进行表面处理,结合界面容易出现气孔等缺陷。未经处理的涂层和基体之间形成冶金结合界面,并生成相应的金属间化合物。随着浇注温度的升高,扩散区域逐渐变宽,涂层逐渐转化为Al12Mg17和Al3Mg2。对复合材料进行热处理,结合界面组织更加均匀,扩散区域的厚度明显增加。<正>镁合金作为目前最轻的金属结构材料,在汽车和航空航天等领域起到明显的减重效果,正得到日益广泛的应用。但镁合金耐蚀、耐磨等表面性能较差,也限制了它的大规模应用。在镁合金表面制备一层Mg-Al金属间化合物,可以在不增加镁合金质量的前提下,同时提高其耐蚀和耐磨性能[1,2]。目前,研究者往往通过表面技术和热处理在镁合金基体表面制备该化合物。例如,L.
The arc-sprayed aluminum coatings and AZ91 D substrates were joined by a solid-liquid bonding method,and the microstructures,elements and phases of the interface were analyzed.The results show that pore defects usually occur in the interface after the coatings are cleaned by surface treatment.Metallurgical bonding is formed between the untreated aluminum coating and AZ91 D substrate,and intermetallic compound layers are found in the interface.As the pouring temperatures rise,the diffusion regions become wider,and the coatings are gradually transformed into Al_（12）Mg_（17） and Al_3Mg_2.With heat treatment on the composite,the interface structure becomes more uniform and the diffusion region becomes thicker.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第7期1861-1865,共5页
Rare Metal Materials and Engineering
关键词
电弧喷涂
复合铸造
扩散
arc spraying
composite casting
diffusion
