J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (9): 2017-2026.DOI: 10.1016/j.jmst.2019.05.017
• Orginal Article • Previous Articles Next Articles
Zhong-Zheng Jinab, Xiu-Ming Chengb, Min Zhaab*(), Jian Rongb, Hang Zhangb, Jin-Guo Wangb, Cheng Wangb, Zhi-Gang Lib, Hui-Yuan Wangabc*()
Online:
2019-09-20
Published:
2019-07-26
Contact:
Zha Min,Wang Hui-Yuan
About author:
1 These authors contributed equally to this work.
Zhong-Zheng Jin, Xiu-Ming Cheng, Min Zha, Jian Rong, Hang Zhang, Jin-Guo Wang, Cheng Wang, Zhi-Gang Li, Hui-Yuan Wang. Effects of Mg17Al12 second phase particles on twinning-induced recrystallization behavior in Mg-Al-Zn alloys during gradient hot rolling[J]. J. Mater. Sci. Technol., 2019, 35(9): 2017-2026.
Fig. 2. EBSD IPF maps and distribution of grain size for as-homogenized (a) pure Mg, (b) AZ31 alloy and (c) AZ91 alloy; (d-f) the corresponding (0002) pole figures, respectively; SEM micrographs for as-homogenized (g) AZ31 alloy and (h) AZ91 alloy.
Fig. 3. (a) SEM micrographs of AZ31 alloy in Region C; (b-d) FESEM micrographs of Mg17Al12 particles around grain boundaries at different deformation stages in AZ91 alloy: (b) Region A corresponding to the initial deformation stage, (c) Region B corresponding to the medium deformation stage, (d) Region C corresponding to the final deformation stage; Inserted in Fig. 3(b-d) are the high magnified images from the yellow frame. The electron beam was approximately parallel to [0001].
Fig. 4. EBSD IPF maps of as-rolled pure Mg, AZ31 and AZ91 alloys at different deformation stages: (a-c) Region A corresponding to the initial deformation stage, (d-f) Region B corresponding to the medium deformation stage, (g-i) Region C corresponding to the final deformation stage.
Fig. 5. KAM maps of as-rolled pure Mg, AZ31 and AZ91 alloys at different deformation stages: (a-c) Region A corresponding initial deformation stage, (d-f) Region B corresponding medium deformation stage, (g-i) Region C corresponding final deformation stage. High local misorientation is identified by red area and low local misorientation is identified by blue area.
Fig. 6. EBSD maps of as-rolled (a-d) pure Mg, (e-h) AZ31 alloy and (i-l) AZ91 alloy in the initial deformation stage (Region A), (a, e, i) EBSD band contrast (BC) maps superimposed by specific twin boundaries by misorientation within a tolerance of 7°, (b, f, j) high magnified images from the yellow frame, (c, g, k) the corresponding EBSD IPF maps and (d,h,l) the corresponding KAM maps. {10$\bar{1}$1}-{10$\bar{1}$2} double twins identified by blue lines reorient the basal planes by 38°, {10$\bar{1}$1} contraction twins identified by green lines reorient by 56° and {10$\bar{1}$2} extension twins identified by red lines reorient by 86°.
Fig. 8. Texture evolution of (a, d, g, j) pure Mg, (b, e, h, k) AZ31 alloy and (c, f, i, l) AZ91 alloy during hot rolling: (a-c) Region A corresponding to the initial deformation stage, (d-f) Region B corresponding to the medium deformation stage, (g-i) Region C corresponding to the final deformation stage.
Fig. 9. The corresponding misorientation angle profiles from Fig. 4 along (a) line 1-3 in pure Mg, (b) line 4-6 in AZ31 alloy and (c) line 7-9 in AZ91 alloy at the initial deformation stage (Region A).
Region | Size of particles (nm) | Volume fraction (%) | Zener pinning pressure (N m-2) | Dislocation density (m-2) | Driving force for DRX (N m-2) |
---|---|---|---|---|---|
A | 520 ± 60 | 4.8 ± 0.6 | 1.4 × 105 | (0.9-1.2) × 1014 | (0.8-1.0) × 105 |
B | 200 ± 90 | 5.9 ± 0.3 | 4.4 × 105 | (2.3-3.5) × 1014 | (2.0-3.0) × 105 |
C | 120 ± 30 | 7.0 ± 0.3 | 8.8 × 105 | (3.1-4.6) × 1014 | (2.7-3.9) × 105 |
Table 1 Quantitative second phase data, calculated Zener pinning pressure and driving force for DRX of AZ91 alloy at three different deformation regions.
Region | Size of particles (nm) | Volume fraction (%) | Zener pinning pressure (N m-2) | Dislocation density (m-2) | Driving force for DRX (N m-2) |
---|---|---|---|---|---|
A | 520 ± 60 | 4.8 ± 0.6 | 1.4 × 105 | (0.9-1.2) × 1014 | (0.8-1.0) × 105 |
B | 200 ± 90 | 5.9 ± 0.3 | 4.4 × 105 | (2.3-3.5) × 1014 | (2.0-3.0) × 105 |
C | 120 ± 30 | 7.0 ± 0.3 | 8.8 × 105 | (3.1-4.6) × 1014 | (2.7-3.9) × 105 |
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