Abstract
The interaction of a microsecond-duration CO 2 laser pulse (10.6 μm) in vacuum with an aluminum alloy containing 1.2% Mn causes a dramatic change in the metallurgical microstructure in the laser-melted region. Second phases which are normally present as discrete particles in the alloy resolidify in the near-surface region in straited bands parallel to the free surface. The rapid solidification process also modifies the chemical composition of the surface, depleting the surface of the alloying elements manganese, silicon and iron. The surface also contains a network of ripples caused by rapid melting and solidification.
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