Microstructure of Laser Surface Alloying Layer of Cast Al Alloy with Ni-Cr-Si-Nb-B

摘要

To improve wear resistance of A1319, with a matrix of power, traveling speed, and thickness of painting powders, a CW CO_2 laser is used to irradiate the surface of samples painted with polymer mixed powder. Analyzing the microstructure of laser surface alloying layer, a conclusion can be drawn that using appropriate parameters a uniform layer can be achieved and the grains in the alloying layer are very fine. Major phases in the alloying layer are NiAl, other different ratios of Ni-Al intermetallics, and Al-based phases.