Laser surface remelting and resolidifying process of Zn–27 wt.% Al alloy

Laser surface remelting and resolidifying process of Zn–27 wt.% Al alloy was studied. Test results showed that alloy microstructure in the remelting zone was greatly refined and homogeneous compared with that in the laser-affected zone and the base material because of the rapid remelting and resolidifying. The hardness of Zn–27 wt.% Al alloy increased greatly compared with that of the base material. The friction and wear features were clearly improved compared with that of the laser-untreated Zn–27 wt.% Al alloy. The mechanism of laser strengthening is also discussed.