Microstructure and texture evolution of the β-Mg17A12 phase in a Mg alloy with an ultra-high Al content

doi:10.1016/j.jmst.2020.04.021

Abstract

Abstract:

In the present study, the effects of equal channel angular pressing (ECAP) on the microstructure and mechanical property of the Mg-20Al alloy were systematically investigated. For the first time, the texture of Mg17Al12 phase and its evolution with ECAP conditions were reported. The results show that increasing the processing temperature and passes generates more uniform distribution and finer size of β-Mg17Al12 phases. The large pieces of β-Mg17Al12 phases are composed of many fine grains with different crystallographic orientations. For the β-Mg17Al12 phase, a preferred distribution of (001) appears at 523 K and 573 K, and hardly varies with temperature. Nevertheless, a random texture is observed at 623 K. The (0002) poles exhibit a preferred distribution at 473 K, but this preferred distribution varies with temperature. A random distribution of (0002) poles is observed when processed at 623 K. Many types of crystallographic planar relationship between β-Mg17Al12 phase and α-Mg matrix are observed and the relationships of {11$\bar{2}$3}//{100} or {110} or {111} and {12$\bar{1}$1}//{100} or //{110} or {111} have a relatively higher frequency than others. The texture of α-Mg matrix is much different from that of the ECAPed Mg alloys with a relative low Al content, in which a texture with basal poles inclining approximately 45° away from the extrusion direction often develops. The mechanical properties of Mg-20Al alloy are closely related to the temperature and passes of ECAP. A higher temperature often decreases the yield strength, but hardly alters the maximum strength. There is a low plasticity for all the samples and increasing processing temperature slightly enhances the plasticity. The corresponding mechanisms were deeply discussed.

Key words: Mg alloy, ECAP, Mg₁₇Al₁₂ phase, Texture evolution

Changjian Yan, Yunchang Xin, Ce Wang, Huan Liu, Qing Liu. Microstructure and texture evolution of the β-Mg₁₇A₁₂ phase in a Mg alloy with an ultra-high Al content[J]. J. Mater. Sci. Technol., 2020, 52: 89-99.

Figures/Tables 19

Fig. 1. Schematic diagrams showing the process of RD-ECAP.

Fig. 2. XRD patterns of the Mg-20Al alloy after different thermomechanical treatments.

Fig. 3. SEM micrographs of the heat-treated and the as-extruded samples: (a), (d) heat-treated; (b), (e) longitudinal-section views and (c), (f) cross-section views of the as-extruded sample.

Fig. 4. SEM micrographs on longitudinal section of the RD-ECAP for 8 passes at: (a), (e) 473 K; (b), (f) 523 K; (c), (g) 573 K; (d), (h) 623 K.

Fig. 5. SEM micrographs on cross section of the RD-ECAP for 8 passes at: (a), (e) 473 K; (b), (f) 523 K; (c), (g) 573 K; (d), (h) 623 K.

Fig. 6. SEM micrographs on longitudinal section of the RD-ECAP for 16 passes at: (a), (d) 523 K; (b), (e) 573 K; (c), (f) 623 K.

Fig. 7. SEM micrographs on cross section of the RD-ECAP for 16 passes at: (a), (d) 523 K; (b), (e) 573 K; (c), (f) 623 K.

Fig. 8. (a) STEM picture taken in the extrusion sample processed by RD-ECAP at 623 K for 16 passes, (b) and (c) Corresponding EDS maps highlighting the Mg and Al elements.

Fig. 9. SEM images, phase distribution, inverse pole figure maps, pole figures of α-Mg matrix and β-Mg17Al12 phases after 8 passes of RD-ECAP at: (a) 473 K; (b) 523 K; (c) 573 K; (d) 623 K. In phase distribution images, the yellow regions correspond to the α-Mg matrix and red regions correspond to the β-Mg17Al12 phases.

Fig. 10. SEM images, phase distribution, inverse pole figure maps, pole figures of α-Mg matrix and β-Mg17Al12 phases after 16 passes of RD-ECAP at: (a) 523 K; (b) 573 K; (c) 623 K. In phase distribution images, the yellow regions correspond to the α-Mg matrix and red regions correspond to the β-Mg17Al12 phases.

Fig. 11. (a) Examples for crystallographic planar relationships between the α-Mg matrix and β-Mg17Al12 phases determined by EBSD analysis technics [27]; (b) Frequency of the crystallographic planar relationships for {0001}, {11$\bar{2}$0}, {10$\bar{1}$0}, {11$\bar{2}$3} and {1$\bar{2}$11} atomic planes of α-Mg matrix parallel to: (b) {100}, (c) {110} and (d) {111} atomic planes of β-Mg17Al12 phases in samples 573-8, 623-8 and 623-16, respectively. Phase distribution images in (a), the blue regions correspond to the α-Mg matrix and red regions correspond to the β-Mg17Al12 phases.

Fig. 12. Frequency of other crystallographic planar relationship between the α-Mg matrix and β-Mg17Al12 phases in samples 573-8, 623-8 and 623-16, respectively.

Fig. 13. Inverse pole figure maps of the α-Mg matrix after RD-ECAP: for 8 passes at (a) 473 K; (b) 523 K; (c) 573 K; (d) 623 K; for 16 passes at (e) 523 K; (f) 573 K; (g) 623 K.

Fig. 14. Pole figures of the α-Mg matrix after RD-ECAP: for 8 passes at (a) 473 K; (b) 523 K; (c) 573 K; (d) 623 K; for 16 passes at (e) 523 K; (f) 573 K; (g) 623 K.

Table 1 The grain size of the α-Mg matrix of RD-ECAPed samples.

Sample	Grain Size (μm)
473-8	2.01
523-8	2.54
523-16	3.34
573-8	4.15
573-16	5.98
623-8	5.66
623-16	6.05

Fig. 15. Frequency distribution of recrystallized grain, sub-structured grain and deformed grain of the β-Mg17Al12 phase in the extrusion sample processed by RD-ECAP.

Fig. 16. Frequency distribution of recrystallized grain, sub-structured grain and deformed grain of the α-Mg matrix in the extrusion sample processed by RD-ECAP.

Fig. 17. True stress-strain curves under compression along the ED of the extrusion sample processed by RD-ECAP.

Fig. 18. Compression properties of the extrusion sample processed by RD-ECAP.

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Microstructure and texture evolution of the β-Mg₁₇A₁₂ phase in a Mg alloy with an ultra-high Al content

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