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The tensile elongation of high-pressure die casting Mg-4Ce-xAl-0.5Mn alloy was significantly improved from 1% to 14% when the Al content was increased from 0 wt% to 3 wt%. Microstructural characterization and fractographic analyses were carried out to reveal the mechanism of ductility enhancement. With increasing Al content, the intermetallic particles evolve from the network-like Mg₁₂Ce to fine acicular Al₁₁Ce₃ with a few small blocky Al₂Ce and Al₁₀Ce₂Mn₇ and to coarse Al₁₁Ce₃, large blocky Al₂Ce and Al₁₀Ce₂Mn₇. The network-like Mg₁₂Ce, large and elongated Al₂Ce and Al₁₀Ce₂Mn₇ particles show the great tendency to cracking, while cracking of the small blocky Al₂Ce and Al₁₀Ce₂Mn₇ particles or fine acicular Al₁₁Ce₃ particles is relatively lag. In Mg-4Ce-0.5Mn alloy, microcracks propagate rapidly along the cracked Mg₁₂Ce particles in the intergranular area. However, both the microcracks in Mg …