J. Mater. Sci. Technol. ›› 2021, Vol. 81: 212-218.DOI: 10.1016/j.jmst.2020.11.062
• Research Article • Previous Articles Next Articles
Huan Zhanga, Yangxin Lia,*(
), Yuxuan Liua, Qingchun Zhua, Xixi Qia, Gaoming Zhua, Jinhui Wangb, Peipeng Jinb, Xiaoqin Zenga,b,**()
Received:2020-09-05
Revised:2020-11-05
Accepted:2020-11-25
Published:2021-01-07
Online:2021-01-07
Contact:
Yangxin Li,Xiaoqin Zeng
About author:**National Engineering Research Center of Light AlloyNet Forming and State Key Laboratory of Metal Matrix Composite, Shanghai JiaoTong University, 200240, Shanghai, PR China.E-mail addresses: xqzeng@sjtu.edu.cn (X. Zeng).Huan Zhang, Yangxin Li, Yuxuan Liu, Qingchun Zhu, Xixi Qi, Gaoming Zhu, Jinhui Wang, Peipeng Jin, Xiaoqin Zeng. The effect of basal <a> dislocation on $\left\{ 11\bar{2}1 \right\}$ twin boundary evolution in a Mg-Gd-Y-Zr alloy[J]. J. Mater. Sci. Technol., 2021, 81: 212-218.
Fig. 1. (a) initial microstructure of GW103 K alloy; (b) grain boundary misorientation angle distribution chart, and (c) {0002} and $\{10\bar{1}0\}$ pole figures.
Fig. 2. The crystallographic features of $\{11\bar{2}1\}$ twin in the SHPBed GW103 K alloy: (a) an EBSD map with multiple twinning modes; (b) an enlarged IPF map of white dash rectangle in (a); (c) and (d) $\{10\bar{1}0\}$ and $\{11\bar{2}1\}$ PFs for the $\{11\bar{2}1\}$ twins, respectively. The spot size is 1 μm.
Fig. 3. (a) a TEM BF image of $\{11\bar{2}1\}$ twins with the incident beam parallel to the <$1\bar{1}00$ > axis; (b-d) SAED patterns taken from corresponding areas in (a); (e) schematic illustration of the perfect SAED pattern of $\{11\bar{2}1\}$ twin. The white lines in (a) represent the basal plane traces of matrix and twins.
Fig. 4. (a) an EBSD map showing the morphology of $\{11\bar{2}1\}$ twin boundary; (b) misorientation analysis of the $\{11\bar{2}1\}$ boundaries selected in (a).
| Slip systems | Schmid factors | ||
|---|---|---|---|
| Matrix | $\{11\bar{2}1\}$ Twin | ||
| Basal <a> | (0001)$[2\bar{1}\bar{1}0]$ | 0.06 | 0.48 |
| (0001) $[\bar{1}2\bar{1}0]$ | 0.03 | 0.20 | |
| (0001) $[\bar{1}\bar{1}20]$ | 0.03 | 0.29 | |
| Prismatic <a> | $(01\bar{1}0)[2\bar{1}\bar{1}0]$ | 0.06 | 0.06 |
| $(10\bar{1}0)[\bar{1}2\bar{1}0]$ | 0.40 | 0.23 | |
| $(\bar{1}100)[\bar{1}\bar{1}20]$ | 0.46 | 0.29 | |
| Pyramidal <a> | $(01\bar{1}1)[2\bar{1}\bar{1}0]$ | 0.02 | 0.17 |
| $(10\bar{1}1)[\bar{1}2\bar{1}0]$ | 0.34 | 0.11 | |
| $(\bar{1}101)[\bar{1}\bar{1}20]$ | 0.42 | 0.39 | |
| $(0\bar{1}11)[2\bar{1}\bar{1}0]$ | 0.08 | 0.29 | |
| $(\bar{1}011)[\bar{1}2\bar{1}0]$ | 0.37 | 0.29 | |
| $(1\bar{1}01)[\bar{1}\bar{1}20]$ | 0.39 | 0.12 | |
| Pyramidal <c + a> | $(2\bar{1}\bar{1}2)[2\bar{1}\bar{1}3]$ | 0.39 | 0.11 |
| $(11\bar{2}\bar{2})[11\bar{2}\bar{3}]$ | 0.19 | 0.27 | |
| $(\bar{1}2\bar{1}2)[\bar{1}2\bar{1}3]$ | 0.02 | 0.11 | |
| $(\bar{2}112)[\bar{2}11\bar{3}]$ | 0.02 | 0.26 | |
| $(\bar{1}\bar{1}22)[\bar{1}\bar{1}2\bar{3}]$ | 0.20 | 0.18 | |
| $(1\bar{2}12)[1\bar{2}1\bar{3}]$ | 0.41 | 0.25 | |
Table 1 Calculated Schmid factors of possible slip systems within the Grain-1 shown in Fig. 4.
| Slip systems | Schmid factors | ||
|---|---|---|---|
| Matrix | $\{11\bar{2}1\}$ Twin | ||
| Basal <a> | (0001)$[2\bar{1}\bar{1}0]$ | 0.06 | 0.48 |
| (0001) $[\bar{1}2\bar{1}0]$ | 0.03 | 0.20 | |
| (0001) $[\bar{1}\bar{1}20]$ | 0.03 | 0.29 | |
| Prismatic <a> | $(01\bar{1}0)[2\bar{1}\bar{1}0]$ | 0.06 | 0.06 |
| $(10\bar{1}0)[\bar{1}2\bar{1}0]$ | 0.40 | 0.23 | |
| $(\bar{1}100)[\bar{1}\bar{1}20]$ | 0.46 | 0.29 | |
| Pyramidal <a> | $(01\bar{1}1)[2\bar{1}\bar{1}0]$ | 0.02 | 0.17 |
| $(10\bar{1}1)[\bar{1}2\bar{1}0]$ | 0.34 | 0.11 | |
| $(\bar{1}101)[\bar{1}\bar{1}20]$ | 0.42 | 0.39 | |
| $(0\bar{1}11)[2\bar{1}\bar{1}0]$ | 0.08 | 0.29 | |
| $(\bar{1}011)[\bar{1}2\bar{1}0]$ | 0.37 | 0.29 | |
| $(1\bar{1}01)[\bar{1}\bar{1}20]$ | 0.39 | 0.12 | |
| Pyramidal <c + a> | $(2\bar{1}\bar{1}2)[2\bar{1}\bar{1}3]$ | 0.39 | 0.11 |
| $(11\bar{2}\bar{2})[11\bar{2}\bar{3}]$ | 0.19 | 0.27 | |
| $(\bar{1}2\bar{1}2)[\bar{1}2\bar{1}3]$ | 0.02 | 0.11 | |
| $(\bar{2}112)[\bar{2}11\bar{3}]$ | 0.02 | 0.26 | |
| $(\bar{1}\bar{1}22)[\bar{1}\bar{1}2\bar{3}]$ | 0.20 | 0.18 | |
| $(1\bar{2}12)[1\bar{2}1\bar{3}]$ | 0.41 | 0.25 | |
Fig. 5. Calculated Schmid factors of possible slip systems in 33 grains including $\{11\bar{2}1\}$ twin, with the distribution shown in (a) the surrounding matrix and (b) $\{11\bar{2}1\}$ twin, respectively. The highest Schmid factor values are selected in each slip system.
Fig. 6. (a) TEM BF images of dislocations within the $\{11\bar{2}1\}$ twin and surrounding matrix, with the incident beam parallel to the $\{1\bar{1}00\}$ axis; (b-d) corresponding SAED patterns taken from regions in (a); basal <a> dislocations identification within the $\{11\bar{2}1\}$ twin and surrounding matrix under different two-beam conditions (e) g = $\{11\bar{2}0\}$ and (f) g = (0002), respectively.
Fig. 7. <c + a> dislocations identification under different two-beam conditions (a) g = (0002) and (b) g = $\{11\bar{2}0\}$, respectively.
Fig. 8. (a-c) HAADF-STEM images of the $\{11\bar{2}1\}$ twin boundaries: (a) the perfect $\{11\bar{2}1\}$ twin boundary with 34°$<1\bar{1}00>$; (b) deviated misorientation $\{11\bar{2}1\}$ twin boundary with a 36° $<1\bar{1}00>$; (c) $\{11\bar{2}1\}$ twin boundary with an extra atomic plane and a step; (d-f) corresponding schematic illustrations for the $\{11\bar{2}1\}$ twin boundary evolution via interacting with basal<a> dislocations.
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