A nonsubstitutional alloy of 7 at. % Cr implanted in single‐crystal aluminum has been irradiated withQ‐switched ruby laser pulses up to 6 J/cm2. Liquid phase epitaxy, resulting in enhanced substitutionality without any Cr redistribution, is observed up to 2 J/cm2for a laser pulse duration of 25 ns. At higher energy densities and with shorter pulses, 12‐nsec duration, convection effects are observed to inhibit liquid phase epitaxy. The surface reflectance appears to reduce due to high implantation dose.