In Situ Characterization of the Effect of Twin-Microstructure Interactions on {1 0 1 2} Tension and {1 0 1 1} Contraction Twin Nucleation, Growth and Damage in Magnesium
Abstract
:1. Introduction
2. Methods and Materials
2.1. Experimental Procedure
2.2. Fractography
2.3. In Situ and Interrupted Electron Backscatter Diffraction (EBSD)
3. Results and Discussion
3.1. Fractographic Analysis of Twin-Interactions Induced Cracks
3.2. Interrupted EBSD Characterization in AOI 1
3.3. Characterization of Contraction Twinning in AOI 2
4. Conclusions
- a
- In situ electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM) micrographs revealed the importance of the twin–slip, twin–GBs, and twin–twin interactions in the formation of large cracks inside the material. Twins nucleating under a very low macroscopic Schmid factor show a greater sensitivity to crack nucleation through these interactions.
- b
- During {1 0 1 2} profuse twinning inside a favorably oriented grain, two variants of which were able to nucleate more substantially on grain boundaries grew much faster than all the other variants. This could be due to an enhanced nucleation of glissile disconnections at the intersection between grain boundary and twin boundary than between two twin boundaries.
- c
- {1 0 1 1} twins nucleate under 〈c〉-axis contraction at much lower CRSS values than those previously reported in the literature under 〈c〉-axis compression. This behavior was attributed to the greater hydrostatic pressure in the case of contraction compared to the case of uniaxial 〈c〉 compression, which may assist the complex shuffles required for this twinning mode.
Author Contributions
Funding
Conflicts of Interest
References
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Slip or Twin Plane | Schmid Factor | Resolved Shear Stress | |
---|---|---|---|
(h k i l) [u v t w] | SF | RSS (MPa) | |
Tension Twin Variants | (1 0 1 2) [1 0 1 1] | 0.499 | 19.96 |
(1 0 1 2) [1 0 1 1] | 0.499 | 19.96 | |
(0 1 1 2) [0 1 1 1] | 0.499 | 19.96 | |
(0 1 1 2) [0 1 1 1] | 0.499 | 19.96 | |
(1 1 0 2) [1 1 0 1] | 0.499 | 19.96 | |
(1 1 0 2) [1 1 0 1] | 0.499 | 19.96 | |
Slip Systems | Basal 〈a〉 | 0 | - |
Pyramidal 〈a〉 | 0 | - | |
Pyramidal 〈c + a〉 | 0.401 | 16.04 |
Tensile Twin Pairs | (0 1 1 2) | (1 1 0 2) | (1 0 1 2) |
Schmid Factor (m) | 0.219 | 0.479 | 0.245 |
Slip or Twin Plane | Schmid Factor | Resolved Shear Stress | |
---|---|---|---|
(h k i l) [u v t w] | SF | RSS (MPa) | |
Comp. Twin Variants | (1 0 1 1) [1 0 1 2] | −0.311 | 21.77 |
(1 0 1 1) [1 0 1 2] | −0.311 | 21.77 | |
(0 1 1 1) [0 1 1 2] | 0 | - | |
(0 1 1 1) [0 1 1 2] | 0 | - | |
(1 1 0 1) [1 1 0 2] | −0.311 | 21.77 | |
(1 1 0 1) [1 1 0 2] | −0.311 | 21.77 | |
Slip Systems | Basal 〈a〉 | 0 | - |
Prismatic 〈a〉 | 0.433 | 30.31 | |
Pyramidal 〈a〉 | 0.382 | 26.74 | |
Pyramidal 〈c + a〉 | 0.446 | 31.22 |
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Russell, W.D.; Bratton, N.R.; Paudel, Y.; Moser, R.D.; McClelland, Z.B.; Barrett, C.D.; Oppedal, A.L.; Whittington, W.R.; Rhee, H.; Mujahid, S.; et al. In Situ Characterization of the Effect of Twin-Microstructure Interactions on {1 0 1 2} Tension and {1 0 1 1} Contraction Twin Nucleation, Growth and Damage in Magnesium. Metals 2020, 10, 1403. https://doi.org/10.3390/met10111403
Russell WD, Bratton NR, Paudel Y, Moser RD, McClelland ZB, Barrett CD, Oppedal AL, Whittington WR, Rhee H, Mujahid S, et al. In Situ Characterization of the Effect of Twin-Microstructure Interactions on {1 0 1 2} Tension and {1 0 1 1} Contraction Twin Nucleation, Growth and Damage in Magnesium. Metals. 2020; 10(11):1403. https://doi.org/10.3390/met10111403
Chicago/Turabian StyleRussell, William D., Nicholas R. Bratton, YubRaj Paudel, Robert D. Moser, Zackery B. McClelland, Christopher D. Barrett, Andrew L. Oppedal, Wilburn R. Whittington, Hongjoo Rhee, Shiraz Mujahid, and et al. 2020. "In Situ Characterization of the Effect of Twin-Microstructure Interactions on {1 0 1 2} Tension and {1 0 1 1} Contraction Twin Nucleation, Growth and Damage in Magnesium" Metals 10, no. 11: 1403. https://doi.org/10.3390/met10111403