J. Mater. Sci. Technol. ›› 2021, Vol. 62: 70-82.DOI: 10.1016/j.jmst.2020.05.036
• Research Article • Previous Articles Next Articles
Yuhui Zhanga, Yuling Liua, Shuhong Liua,*(), Hai-Lin Chenb, Qing Chenb, Shiyi Wena, Yong Dua
Received:
2020-03-05
Revised:
2020-04-26
Accepted:
2020-05-10
Published:
2021-01-30
Online:
2021-02-01
Contact:
Shuhong Liu
About author:
* E-mail address: shhliu@csu.edu.cn (S. Liu).Yuhui Zhang, Yuling Liu, Shuhong Liu, Hai-Lin Chen, Qing Chen, Shiyi Wen, Yong Du. Assessment of atomic mobilities and simulation of precipitation evolution in Mg-X (X=Al, Zn, Sn) alloys[J]. J. Mater. Sci. Technol., 2021, 62: 70-82.
Fig. 1. Calculated self-diffusion coefficients of Mg compared with the corresponding experimental data [[52], [53], [54], [55]] and the previous assessment from Bryan et al. [50].
Fig. 3. Calculated impurity diffusion coefficients of Al in hcp Mg, compared with the corresponding experimental data [32,45,56,[62], [63], [64], [65]], the previous assessments from Bryan et al. [50], Wang et al. [51] and Zhong et al. [45].
Fig. 4. Comparisons between the measured interdiffusion coefficients [32,45,65] and the calculated ones from the present work, the previous assessments from Bryan et al. [50], Wang et al. [51] and Zhong et al. [45].
Fig. 5. Model-predicted concentration profiles of solid/solid Mg/Mg-8.4 at.% Al diffusion couples annealed at 623 K for 96 h (a), Mg/Mg-8.51 at.% Al annealed at 673 K for 17 h (b), Mg/Mg-8.46 at.% Al annealed at 723 K for 24 h (c) compared with the corresponding experimental data [65].
Fig. 6. Calculated self-diffusion coefficients of Zn compared with the corresponding experimental data [[70], [71], [72]] and the previous assessment from Wang et al. [51].
Fig. 7. Calculated impurity diffusion coefficients of Zn in hcp Mg, compared with the corresponding experimental data [31,64,65,[73], [74], [75]], the previous assessment from Bryan et al. [50] and Wang et al. [51].
Fig. 8. Comparisons between the measured inter-diffusion coefficients [31,65] and the calculated ones from the present work, the previous assessments from Bryan et al. [50] and Wang et al. [51].
Fig. 9. Model-predicted concentration profiles of solid/solid Mg/Mg-2.45 at.% Zn diffusion couples annealed at 623 K for 125 h (a), Mg/Mg-1.87 at.% Zn annealed at 673 K for 8 h (b), Mg/Mg-2.23 at.% Zn annealed at 723 K for 24 h (c) compared with the corresponding experimental data [65].
Fig. 10. Calculated impurity diffusion coefficients of Sn in hcp Mg, compared with the corresponding experimental data [31,54] and the previous assessment from Bryan et al. [50].
Fig. 11. Comparisons between the measured inter-diffusion coefficients [31] and the calculated ones from the present work and the extrapolated results without interaction parameters [50].
Alloy (wt.%) | Precipitate | Interfacial energy (J/m2) | Aging temperature (K) | Nucleation site | Molar volume (m3/mol) |
---|---|---|---|---|---|
Mg-9.0 Al [ | Mg17Al12 | 0.026 | 443 | 1E21 | 1.27E-5 |
Mg-6.0 Al [ | 1E22 | ||||
Mg-8.8 Al [ | 473 | 1E20 | |||
Mg-5.9 Al [ | |||||
Mg-6.0 Zn [ | MgZn2 | 0.040 | 473 | 1E20 | 1.02E-5 |
Mg-8.65 Zn [ | 423 | 1E20 | |||
Mg-6.2 Zn [ | 433 | 1E17 | |||
Mg-6.04 Sn [ | Mg2Sn | 0.025 | 473 | 1E14 | 1.55E-5 |
Mg-6.92 Sn [ | 1E14 | ||||
Mg-8.64 Sn [ | 1E16 |
Table 3 Summary of the thermo-physical parameters applied in the precipitation simulations.
Alloy (wt.%) | Precipitate | Interfacial energy (J/m2) | Aging temperature (K) | Nucleation site | Molar volume (m3/mol) |
---|---|---|---|---|---|
Mg-9.0 Al [ | Mg17Al12 | 0.026 | 443 | 1E21 | 1.27E-5 |
Mg-6.0 Al [ | 1E22 | ||||
Mg-8.8 Al [ | 473 | 1E20 | |||
Mg-5.9 Al [ | |||||
Mg-6.0 Zn [ | MgZn2 | 0.040 | 473 | 1E20 | 1.02E-5 |
Mg-8.65 Zn [ | 423 | 1E20 | |||
Mg-6.2 Zn [ | 433 | 1E17 | |||
Mg-6.04 Sn [ | Mg2Sn | 0.025 | 473 | 1E14 | 1.55E-5 |
Mg-6.92 Sn [ | 1E14 | ||||
Mg-8.64 Sn [ | 1E16 |
Fig. 12. Simulated volume fraction of γ-Mg17Al12 phase in Mg-8.8 wt.% Al and Mg-5.9 wt.% Al alloys aging at 473 K with experimental data [78] and previous simulation by Paliwal and Jung [28].
Fig. 13. Simulated volume fraction of γ-Mg17Al12 phase in Mg-9 wt.% Al and Mg-6 wt.% Al alloys aging at 443 K with experimental data [79] and previous simulation by Paliwal and Jung [28].
Fig. 14. Simulated mean radius (a), volume fraction (b) of MgZn2 phase in Mg-6 wt.% Zn alloys aging at 473 K with experimental data [16] and previous simulation by Paliwal and Jung [28].
Fig. 15. Simulated mean radius (a), number density (b), volume fraction (c) of MgZn2 phase in Mg-8.65 wt.% Zn alloys aging at 423 K with experimental data [17] and previous simulation by Paliwal and Jung [28].
Fig. 17. Simulated mean radius (a) and mean length, number density considers the average aspect ratio (b) of Mg2Sn phase in Mg-6.04, 8.64 wt.% Sn alloys aging at 473 K with experimental data [83] and previous simulation by Sun et al. [85].
Fig. 18. Simulated mean radius and mean length (a), number density which considers the average aspect ratio (b) of Mg2Sn phase in Mg-6.92 wt.% Sn alloys aging at 473 K with experimental data [84].
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