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Surface morphologies of uP-Mg-xCa and P-Mg-xCa alloys preheating at 400 °C for 8 h in Ar with uP-Mg-1Ca in (a), uP-Mg-3Ca in (b), uP-Mg-5Ca in (c), P-Mg-1Ca in (d), P-Mg-3Ca in (e) and P-Mg-5Ca in (f). The inserts in (b) uP-Mg-3Ca and (e) P-Mg-3Ca, respectively, are high magnification FESEM images of the Mg-hcp phase in (b)-1 and (e)-1 and the eutectic phase Mg2Ca in (b)-2 and (e)-2.
