Fig. 1 Schematic diagram of the preparation process of the VW93A cabin components: a physical drawing of the cabin, b size drawing of the tensile bar sampling

Fig. 2 3-D atomic structure model of a 14H LPSO phase, b $\beta^{\prime }$ phase

Fig. 3 OM and SEM microstructures of extruded VW93A alloy: a, b OM micrographs; c, d SEM images

Fig. 4 OM and SEM micrographs of samples with different heat treatments: a, d 420 °C × 3 h + 200 °C × 64 h, b, e 450 °C × 5 h + 200 °C × 64 h, c, f 480 °C × 3 h + 200 °C × 64 h; a, b, c OM micrographs, d, e, f SEM images

Fig. 5 IPF coloring images with low-/high-angle grain boundary distributions (the white lines are the low-angle grain boundaries from 2° to 15°, and black lines are high-angle grain boundaries > 15°) and (0001) PFs of samples with different heat treatments: a, b 420 °C × 3 h + 200 °C × 64 h, c, d 450 °C × 5 h + 200 °C × 64 h, e, f 480 °C × 3 h + 200 °C × 64 h

Fig. 6 KAM of samples with different heat treatments: a 420 °C × 3 h + 200 °C × 64 h, b 450 °C × 5 h + 200 °C × 64 h, c 480 °C × 3 h + 200 °C × 64 h

Fig. 7 TEM bright-field images of samples with different heat treatments: a 420 °C × 3 h + 200 °C × 64 h, b 450 °C × 5 h + 200 °C × 64 h, c 480 °C × 3 h + 200 °C × 64 h; electron beam incident direction: B∥[11−20]α-Mg

Fig. 8 Tensile properties of different samples at RT

Fig. 9 Fracture crack characteristics of tensile samples with different heat treatments: a, d, g 420 °C × 3 h + 200 °C × 64 h, b, e, h 450 °C × 5 h + 200 °C × 64 h, c, f, i 480 °C × 3 h + 200 °C × 64 h

Fig. 10 Schematic diagram of the effect of lamellar LPSO and $\beta^{\prime }$ phases forming overlapping structures on intracrystalline dislocation accumulation

Fig. 11 SEM images of cracks generated in the vicinity of a precipitation phases or b grain boundaries when an overlapping structure is precipitated in the grain, c a local magnification of the red dashed box in a, and d a local magnification of the blue dashed box in b

Fig. 12 Stress-strain curves for different embedded phase models

Fig. 13 Strain at complete fracture of the a 14H LPSO + $\beta^{\prime }$ phase overlapping model, b 14H LPSO-phase-only model, and c $\beta^{\prime }$-phase-only model

Fig. 14 Dislocation evolution maps during deformation of the a $\beta^{\prime }$-phase-only model, b 14H LPSO-phase-only model, and c 14H LPSO + $\beta^{\prime }$ phase overlapping model