Twin Nucleation by Slip Transfer across Grain Boundaries in Commercial Purity Titanium

Wang, Leyun; Yang, Yunfan; Eisenlohr, Philip; Bieler, T. R.; Crimp, M. A.; Mason, D. E.

doi:10.1007/s11661-009-0097-6

Cited by 258 publications

(104 citation statements)

References 35 publications

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“…The twinning plane (T-plane) in Cu is (111) tilted B19.5°from the interface. This interface supports the nucleation of twins on the T-plane by two unit mechanisms: dislocation-twin transmission across the interface 35,36,40 and twin nucleation from the interface directly 36,41 . Both are only possible on the T-plane.…”

Section: Resultssupporting

confidence: 60%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

325

156

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Bulk nanostructured metals can attribute both exceptional strength and poor thermal stability to high interfacial content, making it a challenge to utilize them in high-temperature environments. Here we report that a bulk two-phase bimetal nanocomposite synthesised via severe plastic deformation uniquely possesses simultaneous high-strength and high thermal stability. For a bimetal spacing of 10 nm, this composite achieves an order of magnitude increase in hardness of 4.13 GPa over its constituents and maintains it (4.07 GPa), even after annealing at 500°C for 1 h. It owes this extraordinary property to an atomically well-ordered bimaterial interface that results from twin-induced crystal reorientation, persists after extreme strains and prevails over the entire bulk. This discovery proves that interfaces can be designed within bulk nanostructured composites to radically outperform previously prepared bulk nanocrystalline materials, with respect to both mechanical and thermal stability.

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Section: Resultssupporting

confidence: 60%

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Zheng

Beyerlein

Carpenter³

et al. 2013

Nat Commun

325

156

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“…compression and tension deformation twins [16][17][18]. Compression and tension deformation twins are understood to be the primary mechanisms for c-axis compression/shorting and tension/elongation on bulk samples.…”

Section: Resultsmentioning

confidence: 99%

Response of Ti microstructure in mechanical and laser forming processes

et al. 2018

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Microstructural deformation mechanisms present during three different forming processes in commercially pure Ti were analysed. Room temperature mechanical forming, laser beam forming and a combination of these two processes were applied to thick metal plates in order to achieve the same final shape. An electron backscatter diffraction technique was used to study the plate microstructure before and after applying the forming processes. Substantial differences among the main deformation mechanisms were clearly detected. In pure mechanical forming at room temperature, mechanical twinning predominates in both compression and tensile areas. A dislocation slip mechanism inside the compression and tensile area is characteristic of the pure laser forming process. Forming processes which subsequently combine the laser and mechanical approaches result in a combination of twinning and dislocation mechanisms. The Schmid factor at an individual grain level, the local temperature and the strain rate are factors that determine which deformation mechanism will prevail at the microscopic level. The final microstructures obtained after the different forming processes were applied are discussed from the point of view of their influence on the performance of the resulting formed product. The observations suggest that phase transformation in Ti is an additional microstructural factor that has to be considered during laser forming.

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“…Additional details and discussion of the deformation analysis on other specimens from the same material are found in another study. [36] B. Laue Microdiffraction and Peak Streak Analysis…”

Section: A Sample and Deformationmentioning

confidence: 99%

“…[23][24][25][26][27][28][29] Several atomistic and grain-scale models have been proposed to account for the nucleation and growth of T1 twins. [30][31][32][33][34][35][36] In contrast, other twinning modes have received much less attention.…”

mentioning

confidence: 99%

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Wang

Barabash

Bieler

et al. 2013

Metall Mater Trans A

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Activity of the f11 " 21gh " 1 " 126i extension twinning (T2) mode was analyzed in a commercial purity Ti sample after 2 pct tensile strain imposed by four-point bending. The sample had a moderate c-axis fiber texture parallel to the tensile axis. Compared with the many f10 " 12gh " 1011i extension (T1) twins that formed in 6 pct of the grains, T2 twins were identified in 0.25 pct of the grains by scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) maps. Most of the T2 twins exhibited irregular twin boundaries (TBs) on one side of the twin. Highresolution EBSD revealed both intermediate orientations at some matrix/twin interfaces and substantial lattice rotation within some T2 twins. Interactions between matrix hc + ai dislocations 1 3 h1 " 213i and a f11 " 21g T2 twin were investigated by combining SEM/EBSD slip trace characterization and Laue microdiffraction peak streak analysis. hc + ai dislocations that originally glided on a pyramidal plane in the matrix were found on other planes in both the matrix and the twin, which was attributed to extensive cross-slip of the screw component, whose Burgers vector was parallel to the twinning plane. On the other hand, thickening of the twin could engulf some pile-up edge components in front of the TB. During this process, these hc + ai dislocations transmuted from a pyramidal plane ð0 " 111Þ in the matrix to a prismatic plane ð " 1010Þ T in the twin lattice. Finally, possible mechanisms for the nucleation and growth of T2 twins will be discussed.

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Twin Nucleation by Slip Transfer across Grain Boundaries in Commercial Purity Titanium

Cited by 258 publications

References 35 publications

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

High-strength and thermally stable bulk nanolayered composites due to twin-induced interfaces

Response of Ti microstructure in mechanical and laser forming processes

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

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