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Age–hardening behavior of a Mg–4.98Al–1.46Ca (mass%) die–cast alloy was investigated at the temperature range between 473 and 623 K. Transmission electron microscopy shows that fine C15–Al2Ca precipitates with a disc–shaped morphology are placed on the (0001) basal plane of the α–Mg matrix phase at the 523 K/10 h peak–aged condition, while they coarsen at the 623 K/100 h over–aged condition. The ultimate tensile strength of the peak–aged alloy is usually higher than that of the over–aged alloy for approximately 40 MPa at both 298 and 473 K, indicating that the precipitation strengthening by fine C15–Al2Ca precipitates is operative even at high temperatures. Dislocations are introduced within the α–Mg matrix phase of the alloy during die–casting; the dislocations are mostly a type and the dislocation segments are mainly located on the (0001) basal plane. The interrelation between fine C15–Al2Ca precipitates and dislocations during tensile deformation is discussed based on the results of tensile tests. [doi:10.2320/jinstmet.JBW201702]

Strengthening of Mg-Al-Ca Die-Cast Alloy with Fine C15-Al<sub>2</sub>Ca Precipitates