Abstract
A scanning high power CW CO2 laser with an average power density of 13.4 MW cm-2 was used to produce metastable phases in three Ag-Cu alloys; Cu 25 at pct Ag, Cu 50 at pct Ag, and Cu 75 at pct Ag. Scanning, at traverse rates of 10 to 115 cm s-1, was performed in an inert atmosphere to prevent oxidation. Inspection of the trails by scanning electron microscopy showed the microstructure to be either cellular dendritic or featureless. X-ray examination of the trails verified the presence of extended metastable solid solutions. After etching, the transverse section showed alternating light and dark bands perpendicular to the local growth direction. Through the use of energy dispersive X-ray analysis, it was shown that there was a significant increase in the Ag concentration in the light bands.
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