Structural characterization of {10<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si12.gif" overflow="scroll"><mml:mover accent="true"><mml:mn>1</mml:mn><mml:mo stretchy="true">̅</mml:mo></mml:mover></mml:math>2} twin tip in deformed magnesium alloy

Tu, Jian; Zhang, X.Y.; Zhou, Zhiming; Huang, Chuanjun

doi:10.1016/j.matchar.2015.10.012

Cited by 31 publications

(6 citation statements)

References 28 publications

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“…An example of faceted twin tip is shown in Figure 5 [44]. The similar faceted twin tip was also experimentally found in magnesium [14,48] or zinc [50].…”

Section: Faceting Of Twin Boundariessupporting

confidence: 76%

“…An example of faceted twin tip is shown in Figure 5 [44]. The similar faceted twin tip was also experimentally found in magnesium [14,48] or zinc [50]. It was demonstrated that facets can be nucleated by pile-up of disconnections [10][11][12].…”

Section: Faceting Of Twin Boundariessupporting

confidence: 67%

“…Basal-pyramidal facets were also observed in {1011} twins in magnesium [13]. The segments of K2 conjugate twin facets were also experimentally observed in the tips of {1012} twins in Zn 50] and Mg [14]. It was demonstrated that facets can be nucleated by pile-up of disconnections [10][11][12].…”

Section: Faceting Of Twin Boundariesmentioning

confidence: 86%

“…The development of facets in twin boundaries were demonstrated in detail by atomistic simulations [10][11][12]15,17,18] as well as by experimental observations [13,14,16,19]. It was found that twin boundaries can be asymmetrical, e.g., basal-prismatic (BP) interface was widely discussed for {1012} twin [10][11][12]14,18]. The main peculiarity of this twin, compared with the other twins in hcp metals, is that this twin is the most frequent, but the growth mechanisms at the atomic level of this twin are the same as for any other twin in the hcp metals.…”

Section: Introductionmentioning

confidence: 94%

“…For instance, it was demonstrated that faceting of twin boundaries is quite common and real twinning interface does not necessarily coincide with K 1 plane [10][11][12][13][14][15][16][17][18][19]. The development of facets in twin boundaries were demonstrated in detail by atomistic simulations [10][11][12]15,17,18] as well as by experimental observations [13,14,16,19]. It was found that twin boundaries can be asymmetrical, e.g., basal-prismatic (BP) interface was widely discussed for {1012} twin [10][11][12]14,18].…”

Section: Introductionmentioning

confidence: 99%

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Review of Non-Classical Features of Deformation Twinning in hcp Metals and Their Description by Disconnection Mechanisms

Ostapovets

Serra

2020

Metals

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The study of deformation twinning has long history. However new, sometimes surprising, findings have shown that the phenomenon of deformation twinning still is not completely understood. During recent years, some debates are taking place in the scientific literature concerning deformation twinning mechanisms in metals with hcp structure. These debates deal with the importance of special twin boundary dislocations named disconnections, growth and nucleation of twins, non-Schmid behavior of twinning, difference of deformation produced by twins from simple shear. They invoked new propositions for atomistic mechanisms of deformation twinning. The purpose of this review is to compare the classical theories of interfacial defects with the new findings and prove that many of these findings can be understood in terms of these well-established theories. The main attention is paid to summarizing the explanations of different phenomena in terms of disconnection mechanisms in order to show that there is no contradiction between these mechanisms and the new findings.

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“…An example of faceted twin tip is shown in Figure 5 [44]. The similar faceted twin tip was also experimentally found in magnesium [14,48] or zinc [50].…”

Section: Faceting Of Twin Boundariessupporting

confidence: 76%

Section: Faceting Of Twin Boundariessupporting

confidence: 67%

Section: Faceting Of Twin Boundariesmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Review of Non-Classical Features of Deformation Twinning in hcp Metals and Their Description by Disconnection Mechanisms

Ostapovets

Serra

2020

Metals

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Micromechanical Fields Associated with Irregular Deformation Twins in Magnesium

Leu

Kumar

Rottmann

et al. 2022

J. of Materi Eng and Perform

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Understanding and controlling the development of deformation twins is paramount for engineering strong and stable hexagonal close-packed (HCP) Mg alloys. Actual twins are often irregular in boundary morphology and twin crystallography, deviating from the classical picture commonly used in theory and simulation. In this work, the elastic strains and stresses around irregular twins are examined both experimentally and computationally to gain insight into how twins develop and the microstructural features that influence their development. A nanoprecession electron diffraction (N-PED) technique is used to measure the elastic strains within and around a $$\left\{ {10\overline{1}2} \right\}$$ 10 1 ¯ 2 tensile twin in AZ31B Mg alloy with nm scale resolution. A full-field elasto-viscoplastic fast Fourier transform (EVP-FFT) crystal plasticity model of the same sub-grain and irregular twin structure is employed to understand and interpret the measured elastic strain fields. The calculations predict spatially resolved elastic strain fields in good agreement with the measurement, as well as all the stress components and the dislocation density fields generated by the twin, which are not easily obtainable from the experiment. The model calculations find that neighboring twins, several twin thicknesses apart, have little influence on the twin-tip micromechanical fields. Furthermore, this work reveals that irregularity in the twin-tip shape has a negligible effect on the development of the elastic strains around and inside the twin. Importantly, the major contributor to these micromechanical fields is the alignment of the twinning shear direction with the twin boundary.

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