Secondary twin variant selection in four types of double twins in titanium

Xu, Shun; Gong, Mingyu; Jiang, Yanyao; Lecomte, Jean-Sébastien; Wang, Jian

doi:10.1016/j.actamat.2018.03.068

Cited by 75 publications

(12 citation statements)

References 64 publications

(84 reference statements)

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“…Some twins are activated inside grain matrix, while the others appear specially at the OR1 hydride interface regarded as hydride-induced twins. Twin variants are studied in detail by employing the same expression method in [13]: T i I (i = 1, 2,… 6) denoted the six {101 ̅ 2} (T i I ) tension twin variants, while the six {112 ̅ 2} twin variants are represented by C i…”

Section: Plastic Accommodations Stimulated By Hydride Transformationmentioning

confidence: 99%

Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

Wang

Zhao

et al. 2022

Journal of Materials Science & Technology

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Section: Plastic Accommodations Stimulated By Hydride Transformationmentioning

confidence: 99%

Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

Wang

Zhao

et al. 2022

Journal of Materials Science & Technology

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“…The latter one, also named as the apparent SF, is more perceptive, because it plots the loading domain for a specific twin variant with all the possible SFs into an IPF, which is associated with a crystallographic coordinate system of parent grain. This method has advantages of calculating the SFs of the multigeneration of twinning [9][10][11]. The normalized SF, defined as the ratio of each SF to the highest SF, is also adopted in cases that the absolute values of SFs for most twin variants are relatively low due to grain orientation [12,13].…”

Section: Kinds Of Possible Double-twinningmentioning

confidence: 99%

Strain Accommodations among Twin Variants in Ti and Mg

Zhou

Zhu

2021

Crystals

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The selection of twin variants has a great influence on deformation texture and mechanical property in hcp metals where slip systems are limited and twinning types are abundant during deformation. Local strain accommodations among twin variants are considered to shed light on variant selection rules in Ti and Mg alloys. Five kinds of strain accommodations are discussed in terms of different regions that are affected by the twinning shear of primary twin. These regions contain (I) the whole sample, (II) neighboring grain, (III) adjacent primary twin in neighboring grain, (IV) adjoining primary twin within the same parent grain, and (V) multi-generation of twinning inside the primary twin. For a potentially active variant, its operation needs not only relatively higher resolved shear stress but also easily accommodated strain by immediate vicinity. Many of the non-Schmid behaviors could be elucidated by local strain accommodations that variants with relatively higher SFs hard to be accommodated are absent, while those with relatively lower SFs but could be easily accommodated are present.

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“…However, SF criterion is debatable for predicting general twin variant activation, the local stresses inside a grain could differ from the externally applied stress state, only 45 to 50 pct of the cases are correct for the condition of rolling. [11] Displacement gradient accommodation (DGA) can more correctly predict the selection of secondary twin variants [12] and should also be considered on controlling the twin-induced texture evolution.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Commercial Pure Titanium During Interrupted In Situ Tensile Test

Wang

Moll

et al. 2021

Metall Mater Trans A

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Microstructure evolution of commercial pure titanium is investigated by interrupted in situ electron backscatter diffraction (EBSD) measurement during tensile deformation along transverse direction at room temperature. After 24 pct elongation, the split basal texture of initial material is weakened and rotated around 90 deg along normal direction (ND). 11 22-10 12 double twin is the main reason for the change of texture. The basal poles are rotated nearly perpendicular to ND by the primary 11 22 twin and back to ND through the reorientation of 10 12 secondary twin. Both Schmid factor criterion and displacement gradient accommodation are considered to predict the twin-induced texture evolution during TD tension. Kink bands formed by the accumulation of basal hai dislocations are also observed in the deformed grain. The activation of other slip systems can deviate the rotation axis and reduce the rotation angle of kink boundary. Besides, the kink boundary with high basal dislocation density obviously hinders the twin transmission and simultaneously can be taken as a preferential nucleation site for 11 22 twin.

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Secondary twin variant selection in four types of double twins in titanium

Cited by 75 publications

References 64 publications

Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

Strain Accommodations among Twin Variants in Ti and Mg

Microstructure Evolution of Commercial Pure Titanium During Interrupted In Situ Tensile Test

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