J. Mater. Sci. Technol. ›› 2020, Vol. 37: 26-37.DOI: 10.1016/j.jmst.2019.07.036
• Research Article • Previous Articles Next Articles
Yanfu Chaia, Chao Hea, Bin Jiangab*(), Jie Fua**(), Zhongtao Jiangc, Qingshan Yangd, Haoran Shenge, Guangsheng Huanga, Dingfei Zhanga, Fusheng Panab
Received:
2019-05-31
Revised:
2019-07-10
Accepted:
2019-07-15
Published:
2020-01-15
Online:
2020-02-10
Contact:
Jiang Bin,Fu Jie
Yanfu Chai, Chao He, Bin Jiang, Jie Fu, Zhongtao Jiang, Qingshan Yang, Haoran Sheng, Guangsheng Huang, Dingfei Zhang, Fusheng Pan. Influence of minor Ce additions on the microstructure and mechanical properties of Mg-1.0Sn-0.6Ca alloy[J]. J. Mater. Sci. Technol., 2020, 37: 26-37.
Designation | Nominal alloy | Composition (wt%) | |||
---|---|---|---|---|---|
Sn | Ca | Ce | Mg | ||
TXE110 | Mg-1.0Sn-0.6Ca-0.0Ce | 1.31 | 0.64 | - | Bal. |
TXE1102 | Mg-1.0Sn-0.6Ca-0.2Ce | 1.26 | 0.68 | 0.14 | Bal. |
TXE1105 | Mg-1.0Sn-0.6Ca-0.5Ce | 1.32 | 0.69 | 0.53 | Bal. |
TXE111 | Mg-1.0Sn-0.6Ca-1.0Ce | 1.29 | 0.68 | 1.17 | Bal. |
Table 1 Chemical compositions of the as-cast Mg-1.0Sn-0.6Ca-based alloys.
Designation | Nominal alloy | Composition (wt%) | |||
---|---|---|---|---|---|
Sn | Ca | Ce | Mg | ||
TXE110 | Mg-1.0Sn-0.6Ca-0.0Ce | 1.31 | 0.64 | - | Bal. |
TXE1102 | Mg-1.0Sn-0.6Ca-0.2Ce | 1.26 | 0.68 | 0.14 | Bal. |
TXE1105 | Mg-1.0Sn-0.6Ca-0.5Ce | 1.32 | 0.69 | 0.53 | Bal. |
TXE111 | Mg-1.0Sn-0.6Ca-1.0Ce | 1.29 | 0.68 | 1.17 | Bal. |
Fig. 1. OM and backscattered electron- (BSE-) SEM images of the as-cast Mg-1.0Sn-0.6Ca-based alloys: (a) TXE110 alloy; (b) TXE1102 alloy; (c) TXE1105 alloy; (d) TXE111 alloy.
Fig. 2. OM and BSE-SEM images of the as-extruded Mg-1.0Sn-0.6Ca-based alloys: (a) TXE110 alloy; (b) TXE1102 alloy; (c) TXE1105 alloy; (d) TXE111 alloy.
Fig. 5. EBSD inverse pole figure maps and (0001) pole figures from the ED-ND plane of as-extruded Mg-1.0Sn-0.6Ca based alloys: (a) TXE110 alloy; (b) TXE1102 alloy; (c) TXE1105 alloy; (d) TXE111 alloy.
Samples | In tension | In compression | CYS/TYS | ||||
---|---|---|---|---|---|---|---|
TYS (MPa) | UTS (MPa) | EL (%) | CYS (MPa) | UCS (MPa) | EL (%) | ||
TXE110 | 93.3 | 244.6 | 21.9 | 64.2 | 249.2 | 21.8 | 0.69 |
TXE1102 | 96.8 | 263.6 | 27.6 | 79.4 | 250.2 | 22.8 | 0.82 |
TXE105 | 109.4 | 266.3 | 25.2 | 93.3 | 260.9 | 23.1 | 0.85 |
TXE111 | 104.2 | 261.9 | 22.2 | 89.8 | 251.8 | 22.4 | 0.86 |
Table 2 Summary of mechanical properties of four as-extruded alloys which suffer from uniaxial tensile and compressive tests along the ED.
Samples | In tension | In compression | CYS/TYS | ||||
---|---|---|---|---|---|---|---|
TYS (MPa) | UTS (MPa) | EL (%) | CYS (MPa) | UCS (MPa) | EL (%) | ||
TXE110 | 93.3 | 244.6 | 21.9 | 64.2 | 249.2 | 21.8 | 0.69 |
TXE1102 | 96.8 | 263.6 | 27.6 | 79.4 | 250.2 | 22.8 | 0.82 |
TXE105 | 109.4 | 266.3 | 25.2 | 93.3 | 260.9 | 23.1 | 0.85 |
TXE111 | 104.2 | 261.9 | 22.2 | 89.8 | 251.8 | 22.4 | 0.86 |
Fig. 7. Different types of grains, EBSD IPF maps in the ED-ND plane and {0001} pole figures of four as-extruded alloys corresponding to grains with size < 3?μm, 3-12?μm and > 12?μm, respectively: (a) TXE110 alloy; (b) TXE1102 alloy; (c) TXE1105 alloy; (d) TXE111 alloy.
Fig. 8. Experimental (lines) and simulated (symbol) true stress and true strain curves in tension and compression with correspondingly relative activities of different deformation modes in tension: (a) TXE110 alloy sheet; (b) TXE1102 alloy sheet.
Samples | Modes | τ0 (MPa) | τ1 (MPa) | θ0 (MPa) | θ1 (MPa) | hss′ |
---|---|---|---|---|---|---|
TXE110 | Basal slip | 28 | 20 | 200 | 155 | 1 |
Prismatic <a> slip | 70 | 12 | 500 | 70 | 1 | |
Pyramidal <c+a> slip | 150 | 100 | 2800 | 0 | 1 | |
{10-12} tensile twin | 40 | 0 | 0 | 0 | 1 | |
TXE1102 | Basal slip | 34 | 4 | 200 | 165 | 1 |
Prismatic <a> slip | 90 | 5 | 60 | 40 | 1 | |
Pyramidal <c+a> slip | 130 | 85 | 1800 | 0 | 1 | |
{10-12} tensile twin | 45 | 0 | 0 | 0 | 1 |
Table 3 Parameters for VPSC constitutive model of as-extruded TXE110 and TXE1102 alloys.
Samples | Modes | τ0 (MPa) | τ1 (MPa) | θ0 (MPa) | θ1 (MPa) | hss′ |
---|---|---|---|---|---|---|
TXE110 | Basal slip | 28 | 20 | 200 | 155 | 1 |
Prismatic <a> slip | 70 | 12 | 500 | 70 | 1 | |
Pyramidal <c+a> slip | 150 | 100 | 2800 | 0 | 1 | |
{10-12} tensile twin | 40 | 0 | 0 | 0 | 1 | |
TXE1102 | Basal slip | 34 | 4 | 200 | 165 | 1 |
Prismatic <a> slip | 90 | 5 | 60 | 40 | 1 | |
Pyramidal <c+a> slip | 130 | 85 | 1800 | 0 | 1 | |
{10-12} tensile twin | 45 | 0 | 0 | 0 | 1 |
Fig. 10. Quantitative analysis of basal slip and prismatic slip Schmid factor (SF) of the as-extruded TXE110 and TXE1102 alloys during tensile deformation process.
Fig. 11. Quantitative analysis of (0001)/<11-20> basal slip Schmid factor (SF) of the as-extruded alloys under tension along the ED: (a, e) TXE110 alloy; (b, f) TXE1102 alloy; (c, g) TXE1105 alloy; (d, h) TXE111 alloy.
Fig. 12. Schmid factor as a function of relative spatial position and relative distributions for {10-12} twinning under compression along the ED: (a, e) TXE110 alloy; (b, f) TXE1102 alloy; (c, g) TXE1105 alloy; (d, h) TXE111 alloy. Note that a negative value of SF for {10-12} twinning would lead to contraction along the C-axes of grains and not be activated. A minus SF for {10-12} twinning is therefore treated as zero during calculation of the distribution of SFs.
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