A #6 aluminium conductor with an insulation factor of 90 degrees C is rated for 55 amps.
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Copper wire gauge sizes are not equivalent to aluminum wire gauge sizes. The gauge sizes for copper and aluminum wires are different due to their differing electrical conductivity properties. It is not possible to directly convert a copper wire size to an equivalent aluminum wire size.
enameled round aluminum wire enameled flat aluminum wire enameled square aluminum wire
Today the only use of aluminum wire is in service entrances and underground feeds where the larger sizes are needed. By using aluminum the overall project wire costs are kept to a minimum even with the bigger size needed over copper. Wiring branch circuit in aluminum has not been vogue for many years now.
AWG # 6 copper or AWG # 4 aluminum
For a 100A subpanel, a minimum of 1.5-inch Schedule 80 PVC conduit or 1.25-inch rigid metal conduit is recommended. As for the aluminum wire, for a 100A feeder, you would typically use 1/0 AWG aluminum wire for a 3-wire setup or 2/0 AWG aluminum wire for a 4-wire setup. Always consult local electrical codes and a licensed electrician for precise specifications for your installation.