Hardening and microstructure of aluminum metal surface prepared by complex alloying technique

摘要

Hardening and microstructure of aluminum metal surface processed with an ultrasonic vibration assisted CO{sub}2 laser alloying process has been investigated. This complex alloying method was attempted to achieve uniform distribution of the fine dendrite structure and to eliminate pores within surface alloyed layer. Evaluations of the microstructure within the alloyed surface, hardness and tribological properties have been conducted. The alloyed surface consisted of dendrite structures of Ti{sub}3Al and Al-Ti solid solution. The Ti{sub}3Al dendrite seems to adhere effectively to the aluminum phase, and the surface approaches Hv = 600 kg/mm{sup}2 in hardness. Wear resistance of the alloyed specimen was about 7 time that of Al metal.