J. Mater. Sci. Technol. ›› 2020, Vol. 54: 160-170.DOI: 10.1016/j.jmst.2020.04.031
• Research Article • Previous Articles Next Articles
Yu Zhanga,b,*(), Wei Rongb, Yujuan Wub, Liming Pengb,*()
Received:
2020-03-14
Revised:
2020-04-17
Accepted:
2020-04-18
Published:
2020-10-01
Online:
2020-10-21
Contact:
Yu Zhang,Liming Peng
Yu Zhang, Wei Rong, Yujuan Wu, Liming Peng. Achieving ultra-high strength in Mg-Gd-Ag-Zr wrought alloy via bimodal-grained structure and enhanced precipitation[J]. J. Mater. Sci. Technol., 2020, 54: 160-170.
Fig. 1. (a) BSE-SEM image and (b) orientation map showing the grain shape, size and orientation of the alloy after homogenisation treatment at 500 °C for 6 h. Representative EDS spectra collected from α-Mg matrix (c) and cuboid phase (d), respectively. The inset in (a) shows an enlarge image of a cuboid phase. The orientation map in (b) is coloured using an inverse pole figure (IPF) colouring scheme.
Fig. 2. (a-d) BSE-SEM images showing microstructure of the alloy after (a, b) ITE and (c, d) DTE; (e) BF-STEM image showing second-phase particles located at triple conjunctions of grain boundaries; (f) a representative EDS spectrum collected from a second-phase particle. (b) and (d) are enlarged images of particle-rich regions in the ITE and DTE samples, respectively, and the orange arrows indicate that second-phase particles mainly distribute along grain boundaries. The inset in (e) is the corresponding SAED pattern of the particle indicate by the blue arrow. The extrusion direction in (a-d) is horizontal.
Fig. 3. (a) Orientation map of the ITE sample; (b-d) IPFs of the whole data set, the DRXed grain subset and the unDRXed grain subset, respectively. The schematic diagrams at the bottom right corner of (a) show the observation plane, the sample coordination system and the legend for (a). The orientation map (a) and IPFs (b-d) are constructed referring to ED and (a) is coloured based on an IPF colouring scheme.
Fig. 4. (a) Orientation map of the DTE sample; (b-d) IPFs of the whole data set, the DRXed grain subset and the unDRXed grain subset, respectively. The schematic diagrams at the bottom right corner of (a) illustrate the observation plane, the sample coordination system and the legend for (a). The orientation map (a) and IPFs (b-d) are constructed referring to ED and (a) is coloured based on an IPF colouring scheme.
Fig. 5. $\left\{ 0001 \right\}$ and $01\bar{1}0$ PFs of the ITE (a-d) and DTE (e-h) samples. The number at the bottom of each PF indicates the corresponding maximum intensity. (c) and (d) are the unDRXed grain subset extracted from (a) and (b), respectively and (g) and (h) are the unDRXed grain subset extracted from (e) and (f), respectively.
Fig. 6. (a) Orientation map of the DTER sample; (b-d) IPFs of the whole data set, the DRXed grain subset and the unDRXed grain subset, respectively. The schematic diagrams at the bottom right corner of (a) illustrate the observation plane, the sample coordination system and the legend for (a). The orientation map (a) and IPFs (b-d) are constructed referring to ND and (a) is coloured based on an IPF colouring scheme.
Fig. 7. $~\left\{ 0001 \right\}$ and $\left\{ 01\bar{1}0 \right\}$ P PFs of the ITE and DTE samples. The number under each PF indicates the maximum intensity. (a and b) are constructed with the projection plane perpendicular to RD and (c and d) are constructed with the projection plane perpendicular to ND.
Fig. 8. Orientation maps showing the grain shape and orientation in the (a) ITEA, (b) DTEA and (c) DTERA samples. The legends for the orientation maps and the corresponding IPFs are shown at the top-right and bottom-left corners of (a-c), respectively. (a) and (b) are constructed referring to ED while (c) is constructed referring to ND. The observation plane and sample coordination system of the ITEA, DTEA and DTERA samples are the same to their ITE, DTE and DTER counterparts shown in Figs. 3, 4 and 6.
Fig. 9. HAADF-STEM images showing morphology and distribution of precipitates in the (a, b) ITEA, (c, d) DTEA and (e, f) DTERA samples. The electron beam is parallel to 2ˉ110 α in (a, c, e) and [0001]α in (b, d, f), respectively.
Fig. 10. Quantitative measurements of precipitates in the ITEA, DTEA and DTERA samples; (a) the averaged diameter of γ′′ precipitates; (b) the averaged length and width of β′ precipitates; (c) the averaged length of chain-like structures; (d) the number densities of γ′′, β′ and chain-like structures. The diameter of γ′′ precipitates is measured along $\left\langle 10\bar{1}0 \right\rangle $ α in $\left\langle \bar{2}110 \right\rangle $ α HAADF-STEM images; the length and width of β′ precipitates are measured along $\left\langle 10\bar{1}0 \right\rangle $ α and $\left\langle \bar{2}110 \right\rangle $ α, respectively, in [0001]α HAADF-STEM images; and the length of chain-like structures is measured along $\left\langle 10\bar{1}0 \right\rangle $α in [0001]α HAADF-STEM images.
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