SiCp/6061Al复合材料激光表面熔化及合金化显微组织与耐蚀性

Microstructure and Corrosion Resistance of Laser Surface Melted and Laser Surface Alloyed SiCp/6061Al Metal Matrix Composite

为提高颗粒增强铝基复合材料耐蚀性，对ＳｉＣｐ／６０６１Ａｌ复合材料进行激光表面熔化和激光表面合金化。结果表明：激光表面熔化后，因熔化层中形成大量耐蚀性低的针状Ａｌ_４Ｃ_３相及Ａｌ_４ＳｉＣ相而使激光表面熔化层耐蚀性降低，以Ｎｉ－Ｃｒ－Ｂ粉末为原料对ＳｉＣｐ／６０６１Ａｌ复合材料进行激光表面合金化后，合金层耐蚀性明显提高。

Laser surface melting and laser surface alloying with Ni-Cr-B powders are utilized to improve the corrosion resistance of SiC particle reinforced aluminum alloy metal matrix composite (SiCp/6061Al MMC). Results show that the corrosion resistance of SiCp/6061Al is slightly decreased after laser surface melting treatment due to the formation of the Al_4C_3 and Al_4SiC needle-like phases in the laser melted zone. The corrosion resistance of the SiCp/6061Al composite is substantially enhanced after surface alloying with Ni -Cr -B powders.