Microstructure, mechanical properties and corrosion behavior of lightweight (Ti₆₀Cr₃₀Nb₁₀)_100-xAl_x (x=0, 5, 7.5 and 10, at.%) medium-entropy alloys (MEAs) were investigated in the as-cast and homogenized states. As the Al content increases from 0 to 10 at.%, all the as-cast MEAs consist of identical phase composition, i.e., a body-centered cubic (BCC) phase and a small amount of TiCr₂ Laves phase. After the homogenization, all the homogenized MEAs show a single BCC phase. The (Ti₆₀Cr₃₀Nb₁₀)₉₅Al₅ MEA shows the most excellent mechanical properties both in as-cast and homogenized states among the studied alloys, displaying yield strengths of ~1048 MPa and ~1017 MPa along with the compression strain exceeding 50%. Additionally, compared with the TC4 and the as-cast (Ti₆₀Cr₃₀Nb₁₀)₉₅Al₅ alloys, the homogenized (Ti₆₀Cr₃₀Nb₁₀)₉₅Al₅ alloy shows superior corrosion resistance due to its uniform microstructure and chemical composition.