Figure 1.
SEM microstructure images of the as-cast alloys.
Figure 1.
SEM microstructure images of the as-cast alloys.
Figure 2.
SEM microstructure images of the as-cast alloys. (a) ZCI, (b) ZCII, (c) ZCIII, (d) ZCIV, (e) ZCV, (f) ZCVI.
Figure 2.
SEM microstructure images of the as-cast alloys. (a) ZCI, (b) ZCII, (c) ZCIII, (d) ZCIV, (e) ZCV, (f) ZCVI.
Figure 3.
The morphologies of the secondary phases separated from experiment alloy: (a) ZCIII, (b) ZCVI.
Figure 3.
The morphologies of the secondary phases separated from experiment alloy: (a) ZCIII, (b) ZCVI.
Figure 4.
XRD results of as-cast alloy and its solid separation. (a) ZCVI, (b) Comparison of XRD results of alloy solid phase separation.
Figure 4.
XRD results of as-cast alloy and its solid separation. (a) ZCVI, (b) Comparison of XRD results of alloy solid phase separation.
Figure 5.
TEM micrograph of ZCVI alloy (a) Bright field TEM image, (b) High-resolution image and its FTT patterns.
Figure 5.
TEM micrograph of ZCVI alloy (a) Bright field TEM image, (b) High-resolution image and its FTT patterns.
Figure 6.
SEM microstructure images of the as-homogenized alloys. (a) ZCI, (b) ZCII, (c) ZCIII, (d) ZCIV, (e) ZCV, (f) ZCVI, (g) The morphology of ZCVI compound, (h) Separated solid phases sample of ZCⅥ.
Figure 6.
SEM microstructure images of the as-homogenized alloys. (a) ZCI, (b) ZCII, (c) ZCIII, (d) ZCIV, (e) ZCV, (f) ZCVI, (g) The morphology of ZCVI compound, (h) Separated solid phases sample of ZCⅥ.
Figure 7.
XRD spectrums of solid phases separated from homogeneous alloys.
Figure 7.
XRD spectrums of solid phases separated from homogeneous alloys.
Figure 8.
Comparison of quantitative analysis results of the (Mg, Zn)12Ce phase. (a) As-cast alloys, (b) homogeneous alloys.
Figure 8.
Comparison of quantitative analysis results of the (Mg, Zn)12Ce phase. (a) As-cast alloys, (b) homogeneous alloys.
Figure 9.
SEM microstructure image of deformed alloys. Red arrow direction is the extrusion direction (ED) (a) ZCI, (b) ZCII, (c) ZCIII0, (d) ZCIV, (e) ZCV, (f) ZCVI.
Figure 9.
SEM microstructure image of deformed alloys. Red arrow direction is the extrusion direction (ED) (a) ZCI, (b) ZCII, (c) ZCIII0, (d) ZCIV, (e) ZCV, (f) ZCVI.
Figure 10.
Stress–strain curve of experimental alloy.
Figure 10.
Stress–strain curve of experimental alloy.
Figure 11.
Recrystallization grain size and area calculation. (a) ZCI, (b) ZCII, (c) ZCIII, (d) ZCIV, (e) ZCV, (f) ZCVI.
Figure 11.
Recrystallization grain size and area calculation. (a) ZCI, (b) ZCII, (c) ZCIII, (d) ZCIV, (e) ZCV, (f) ZCVI.
Figure 12.
Scheil–Gulliver non-equilibrium solidification model. (a) Calculated results of S-G model for experimental alloy, (b) Enlarged view of the red area in the figure on the right.
Figure 12.
Scheil–Gulliver non-equilibrium solidification model. (a) Calculated results of S-G model for experimental alloy, (b) Enlarged view of the red area in the figure on the right.
Figure 13.
Mass fraction of elements in the remaining melt. (a) Calculated mass fraction of Ce and Zn elements in the remaining melt, (b) Correspondence between the Zn/Ce mass ratio and the compound mass fraction in the alloy and the remaining melt.
Figure 13.
Mass fraction of elements in the remaining melt. (a) Calculated mass fraction of Ce and Zn elements in the remaining melt, (b) Correspondence between the Zn/Ce mass ratio and the compound mass fraction in the alloy and the remaining melt.
Figure 14.
Curves of σ.
Figure 14.
Curves of σ.
Figure 15.
Influence of the number fraction of rare earth compounds on recrystallized grains.
Figure 15.
Influence of the number fraction of rare earth compounds on recrystallized grains.
Figure 16.
Typical stress–strain and θ−ε curves. (a) ZCIII alloy, (b) ZCVI alloy.
Figure 16.
Typical stress–strain and θ−ε curves. (a) ZCIII alloy, (b) ZCVI alloy.
Figure 17.
Peak stress of experimental alloys.
Figure 17.
Peak stress of experimental alloys.
Table 1.
Design composition and measured composition of Mg–Zn–Ce–Zr alloys.
Table 1.
Design composition and measured composition of Mg–Zn–Ce–Zr alloys.
Alloy Code | Nominal Alloys | Composition (wt.%) |
---|
Zn | Ce | Zr | Mg |
---|
ZCI | Mg–3Zn–0.5Ce–0.5Zr | 2.599 | 0.619 | 0.517 | Bal. |
ZCII | Mg–3Zn–1.0Ce–0.5Zr | 3.042 | 0.936 | 0.522 | Bal. |
ZCIII | Mg–3Zn–1.5Ce–0.5Zr | 2.697 | 1.525 | 0.513 | Bal. |
ZCⅣ | Mg–6Zn–0.5Ce–0.5Zr | 5.410 | 0.533 | 0.570 | Bal. |
ZCⅤ | Mg–6Zn–1.0Ce–0.5Zr | 5.900 | 1.055 | 0.510 | Bal. |
ZCⅥ | Mg–6Zn–1.5Ce–0.5Zr | 5.560 | 1.412 | 0.540 | Bal. |
Table 2.
EDS Analysis Results of Typical Alloy Solid Phase Separation.
Table 2.
EDS Analysis Results of Typical Alloy Solid Phase Separation.
Mark Position | Composition (at.%) |
---|
Zn | Ce | Zr | Mg |
---|
A | 17.93 | 7.21 | | 74.86 |
B | 71.80 | | 28.20 | |
C | 22.73 | 6.95 | | 70.32 |
D | 59.46 | | | 40.54 |
Table 3.
The mass fraction of the (Mg, Zn)12Ce phase in the as-cast alloys.
Table 3.
The mass fraction of the (Mg, Zn)12Ce phase in the as-cast alloys.
| ZCI | ZCII | ZCIII | ZCIV | ZCV | ZCVI |
---|
(Mg, Zn)12Ce phase | 3.586 | 4.875 | 5.262 | 3.950 | 6.617 | 7.040 |
Table 4.
The mass fraction of the (Mg, Zn)12Ce phase in the homogeneous alloys.
Table 4.
The mass fraction of the (Mg, Zn)12Ce phase in the homogeneous alloys.
Compound | ZCI | ZCII | ZCIII | ZCIV | ZCV | ZCVI |
---|
(Mg, Zn)12Ce phase | 2.093 | 2.884 | 3.183 | 4.990 | 7.045 | 7.253 |
Table 5.
Measurement results of recrystallized grains.
Table 5.
Measurement results of recrystallized grains.
| ZCI | ZCII | ZCIII | ZCIV | ZCV | ZCVI |
---|
Average diameter (μm) | 4.703 | 4.578 | 4.056 | 5.056 | 4.791 | 3.856 |
Average area (μm2) | 6.885 | 5.706 | 5.593 | 8.344 | 6.866 | 5.608 |
Area fraction (%) | 4.068 | 5.073 | 5.616 | 6.098 | 9.868 | 16.760 |
Table 6.
Critical strain in experimental alloys of various compositions.
Table 6.
Critical strain in experimental alloys of various compositions.
| ZCI | ZCII | ZCIII | ZCIV | ZCV | ZCVI |
---|
| 0.09693 | 0.09307 | 0.09120 | 0.15520 | 0.10496 | 0.09206 |
| 67.089 | 60.982 | 60.636 | 70.596 | 64.278 | 62.183 |