Microstructure and strength of Laser Welds of sub-Micron Particulae- reinforced Aluminum Matrix Composite Al_2O_3P/6061Al

摘要

The microstructure of laser welds of sub-micron particulate-reinforced aluminum matrix composite Al_2O_3p/6061Al and the welds ability of the material were studied. Experimental results indicated that because of the huge Specific surface area of the reinforcement, the interfacial reaction between the matrix and the reinforcement was re- Strained intensively at elevated temperature and pulsed laser beam. The main factor affecting the weldability of the com- Posite was the reinforcement segregation in he weld resulting from the push of the liquid/solid interface during the soli- Dification of the molten pool.