摘要
采用二氧化碳激光器在ZM5镁合金上熔化预置的Al粉,由此获得了富Al的Mg-Al合金化层。显微硬度测试表明激光Al合金化使ZM5合金基材表面由HV75-80提高到HV275-325;XRD分析表明合金化层主要由Al和Mg17Al12组成。由于有物质的对流使得合金化层的组织呈现出两种不同的形貌,而且组织存在渐变。极化曲线测试表明经过激光Al合金化后,耐蚀性得到提高。
Laser alloying of Al powder on ZM5 magnesium alloy was achieved by using a CO2 laser re-melting of preplaced powder. The alloying layers consisted of Al-rich Mg-Al coating. The microhardness was increased from HV75-80 in the substrate to HV275-325 in the coating layer in values. The phases formed on the alloying layer are Al and Mg17 Al12. The appearance of the cladding layer shows two different morphologies and there exists microstructure evolution in the alloying layer due to the convection during the alloying process. The potentiodynamic polarization results confirmed that the corrosion resistance was enhanced after laser Alloying of Al compared to the untreated ZM5 substrate.
出处
《应用激光》
CSCD
北大核心
2007年第4期261-268,共8页
Applied Laser
基金
国家自然科学基金项目(项目编号:50371093)
关键词
镁合金
激光合金化
铝粉
组织
腐蚀
对流
Magnesium alloy
laser alloying
al powder
microstructure
corrosion
convection
