Fig. 1. OM and SEM images of Mg alloy NZ31 in (a)-(b) as-cast condition and solutionized condition at temperature (c) 475 °C, (d) 500 °C, and (e and f) 525 °C for 14 h. ((b) and (f) are SEM images).

Fig. 2. Bright field image of precipitates in Mg alloy NZ31 (a) solutionized at 525 °C for 14 h, and then aged at 200 °C for (b) 3 h, (c) 12 h and (d) 48 h.

Fig. 3. Segments of engineering strain-stress curves at temperature 250 °C with a strain rate of 1 × 10-3 s-1 at different heat treatment conditions.

Fig. 4. (a) Critical strain of serrated flow and (b) average serration amplitude of samples in different conditions.

Fig. 5. Mechanical properties of the Mg alloy NZ31 at 250 °C in different condition.

Fig. 6. (a) Engineering strain-stress curves at 250 °C with a strain rate of 1 × 10-3 s-1 and (b) concentration of solutionized Nd atoms and the volume percent of eutectic compounds in different solutionized condition.

Fig. 7. (a) Type B serration of sample in solutionized condition, and (b) type A serration of samples in 3 h-aging condition [8].

Fig. 8. TEM bright field image of the interaction between precipitates and dislocations.