Heat effects of amorphous FeCuNbSiB alloy ablated with femtosecond laser

The purpose of this study was to observe directly the morphology change and grain structure of FeCuNbSiB alloy when it is ablated with femtosecond laser pulses. The morphology and grain microstructure of amorphous FeCuNbSiB alloy was studied using scanning electron microscopy and field emission transmission electron microscopy. The results indicate that partial crystallization occurs at the rim of the laser-ablated hole, where the grain orientations are identical, and there is an amorphous layer outside the grains. This demonstrates that the liquid phase created by the femtosecond laser pulses has led to re-crystallized and partially crystallized zones.