The mechanism of twinning activation and variant selection in magnesium alloys dominated by slip deformation

Liu, Guodong; Xin, Renlong; Shu, Xiaogang; Wang, Chunpeng; Qing, Liu

doi:10.1016/j.jallcom.2016.06.136

Cited by 51 publications

(12 citation statements)

References 35 publications

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“…The values of m′ depend on the 'alignment' of slip systems in the neighbouring grains with the twin variant in the parent grain. The low values of m′, as reported in the current investigation, have also been reported in independent studies [Wang et al (2014), Liu et al (2016), Zhou et al (2020)], which emphasize the importance of investigating the effect of local deformation fields (stress, dislocation density etc.,) in twin variant selection. Zhou et al (2020) have shown that, in slip assisted twinning, it is necessary to consider the local slip activity while predicting the twin variant selection using m′.…”

Section: Geometric Compatibility Factor and Shear Strain Accommodation Analysissupporting

confidence: 88%

Twin nucleation and variant selection in Mg alloys: An integrated crystal plasticity modelling and experimental approach

Paramatmuni

Zheng

Rainforth

et al. 2020

International Journal of Plasticity

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Extension twin nucleation and variant selection in magnesium alloy WE43 is investigated in experimentally characterised and deformed microstructures replicated in crystal plasticity models. Stored (dislocation) energy density is found to identify the experimentally observed locations of twins which are not otherwise explained by global Schmid factors or local resolved shear stress criteria. A critical stored energy of 0.015 Jm -2 was determined below which twin nucleation does not occur. The stored energy density explains the locations of the observed twins and the absence of twins in parent grains anticipated to be favourable for twin nucleation.Twin variant selection has been shown to be driven by minimising locally stored shear energy density, while the geometric compatibility and strain compatibility factors only aid in partial prediction. All experimentally observed variants were correctly determined.

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Section: Geometric Compatibility Factor and Shear Strain Accommodation Analysissupporting

confidence: 88%

Twin nucleation and variant selection in Mg alloys: An integrated crystal plasticity modelling and experimental approach

Paramatmuni

Zheng

Rainforth

et al. 2020

International Journal of Plasticity

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“…Apparently, their activation is not stimulated by the externally applied rolling deformation here. However, as reported in recent studies, extension twinning could also be activated by the requirement of local strain accommodation . In addition, some {10–12} extension twins may be formed in the grains that are largely deviated from the basal texture.…”

Section: Resultssupporting

confidence: 51%

Evaluation of Textural Effect on the Rollability of AZ31 Alloys by Wedge‐Shaped Sample Design

et al. 2017

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This paper aims to compare the textural effect on the rollability of Mg alloy sheets at different temperatures. Wedge-shaped AZ31 alloy plates with two kinds of initial textures are designed and rolled at five different temperatures. Then, the rollability under different conditions can be evaluated by observing the development of edge-cracks. The results show that the initial texture has little influence on the single-pass rollability at low temperatures (100 and 150 C), while the influence is significant for rolling above 150 C. Schmid factor and in-grain misorientation axis analyses revealed that the textural effect on the activation of prismatic glide accounted for the observed distinct rollability at elevated temperatures.

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“…3). Another study showed that the selection of the twin variant for extension twinning in Mg is determined by a geometric compatibility factor (m ) between slip and twin [226]. This type of non-Schmid's behavior for twin variant selection have also been observed for titanium alloys [227,228].…”

Section: Computation Of Adequate Twin Spacingmentioning

confidence: 84%

A Review on Capturing Twin Nucleation in Crystal Plasticity for Hexagonal Metals

Paudel

Giri

Priddy

et al. 2021

Metals

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Owing to its ability to incorporate Schmid’s law at each integration point, crystal plasticity has proven a powerful tool to simulate and predict the slip behavior at the grain level and the ensuing heterogeneous stress/strain localization and texture evolution at the macroscopic level. Unfortunately, notwithstanding substantial efforts during the last three decades, this remarkable capability has not been replicated for materials where twinning becomes a noticeable deformation mechanism, namely in the case of low-stacking fault energy cubic, orthorhombic, and hexagonal close-packed structures. The culprit lies in the widely adopted unphysical pseudo-slip approach for capturing twin formation. While the slip is diffuse, twinning is a localized event that occurs as a drastic burst of a confined number of partial twinning dislocations establishing an interface that pursues growth through a thread of perfect twinning dislocations in the sense of bicrystallography. Moreover, at earlier stages, twin nucleation may require atomic diffusion (Shuffling) and faceting, generally demanding higher stress levels not necessarily on the twin shear plane, while triaxiality at adequate sites might be needed or preferred such as lower grain boundary misorientations or other twin boundaries. Identifying a mathematical framework in the constitutive equations for capturing these twin formation sensitivities has been a daunting challenge for crystal plasticity modelers, which has stalled ameliorating the design of key hexagonal materials for futuristic climate change-related industries. This paper reviews existing approaches to incorporating twinning in crystal plasticity models, discusses their capabilities, addresses their limitations, and suggests prospective views to fill gaps. The incorporation of a new physics-based twin nucleation criterion in crystal plasticity models holds groundbreaking potential for substantial progress in the field of computational material science.

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The mechanism of twinning activation and variant selection in magnesium alloys dominated by slip deformation

Cited by 51 publications

References 35 publications

Twin nucleation and variant selection in Mg alloys: An integrated crystal plasticity modelling and experimental approach

Twin nucleation and variant selection in Mg alloys: An integrated crystal plasticity modelling and experimental approach

Evaluation of Textural Effect on the Rollability of AZ31 Alloys by Wedge‐Shaped Sample Design

A Review on Capturing Twin Nucleation in Crystal Plasticity for Hexagonal Metals

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