Hardening and microstructure of aluminum metal surface by laser alloying process

Hardening and microstructure of aluminum metal surface with CO 2 laser alloying process have been investigated. Mixtures of Al, Ti powder and organic flux used as alloying elements was painted onto the metal surface and irradiated by one step specimen move technique. To address uniformly distribution of the fine dendrite structure and eliminating of many pores occurred within alloyed layer, new complex technique of laser irradiation with ultrasonic radiation methods was attempted together to modify them. Evaluations of the microstructure within the alloyed surface, hardness and tribological properties have been conducted. The alloyed surface consisted of dendrite structures of the Ti 3 Al and Al-Ti solid solution. The Ti 3 Al dendrite crystallized leads to adhere effectively to the aluminum phase, and the surface approaches Hv equals 600 kg/mm 2 in hardness. As substantial tribological property, the wear resistance of the alloyed specimen to cast iron was around less 1/7 time than that with comparing of Al metal.