Abstract This paper reports on laser surface remelting experiments performed on a Zn--2wt.%Cu hypoperitectic alloy by employing a 5kW CW CO2 laser at scanning velocities between 6 and 1207mm/s. The growth velocities of the microstructures in the laser molten pool were accurately measured. The planar interface structure caused by the high velocity absolute stability was achieved at a growth velocity of 210 mm/s. An implicit expression of the critical solidification velocity for the cellular--planar transition was carried out by nonlinear stability analyses of the planar interface. The results showed a better agreement with the measured critical velocity than that predicted by M--S theory. Cell-free structures were observed throughout the whole molten pool at a scanning velocity of 652~mm/s and the calculated minimum temperature gradient in this molten pool was very close to the critical temperature gradient for high gradient absolute stability (HGAS) of the $\eta$ phase. This indicates that HGAS was successfully achieved in the present experiments.
Received: 11 October 2005
Revised: 07 December 2005
Accepted manuscript online:
Su Yun-Peng (苏云鹏), Lin Xin (林鑫), Wang Meng (王猛), Xue Lei (薛蕾), Huang Wei-Dong (黄卫东) Absolute stability of the solidification interface in a laser resolidified Zn--2wt.%Cu hypoperitectic alloy 2006 Chinese Physics 15 1631
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