The microstructure and mechanical properties of rapidly solidified Al-Cr alloys were investigated by XRD,TEM and microhardness testing instrument.The results indicate that the matrix of rapidly solidified Al-Cr alloys isα-Al solid solution when the Cr content is lower than 4 wt%.However, when the Cr content is above 4 wt%,the microstructures of rapidly solidified Al-Cr alloys are different along cross section.The microstructure of alloy contacting copper roller consists ofα-Al and a few intermetallic compounds.With the increase of distance from copper roller,the matrix consists ofα-Al and spherical intermetallic compounds which conglomerate inα-Al matrix.These intermetallic com- pounds are Al_7Cr,Al_(11) Cr and Al_4Cr.The tensile strength has the maximal value when the Cr content isabout 8 wt%.The annealed microstructures show that supersaturatedα-Al solid solution dissolved with increasing anneal temperature.The starting temperature of the second phase precipitated from the supersaturatedα-Al solid solution desponds on the supersaturation.Meanwhile,the microhardness of rapidly solidified Al-Cr alloy reaches maximal value after annealing at 300℃.