Crystal plasticity FEM study of twinning and slip in a Mg single crystal by Erichsen test

Hyun, Chul; Kim, M.S.; Choi, Shi‐Hoon; Shin, Kwang Seon

doi:10.1016/j.actamat.2018.06.042

Cited by 22 publications

(5 citation statements)

References 67 publications

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“…Stretch formability Stretch formability of single crystal sheets of pure Mg along different directions has been evaluated by Erichsen cupping test at room temperature. [119] Sheets of 1 mm thickness and of selected orientations were cut from bulk single crystals, and the Erichsen test was performed with a punch speed of 0.0833 mm s À1 and a punch diameter of 20 mm. [119] The depth of the punching at which fracture occurs, generally known as the Erichsen Index, was used to evaluate sheet formability.…”

Section: Deformation and Microstructures Of Pure Magnesiummentioning

confidence: 99%

“…[119] Sheets of 1 mm thickness and of selected orientations were cut from bulk single crystals, and the Erichsen test was performed with a punch speed of 0.0833 mm s À1 and a punch diameter of 20 mm. [119] The depth of the punching at which fracture occurs, generally known as the Erichsen Index, was used to evaluate sheet formability. angle between the loading direction and the c-axis is 45 deg for the orientations A and D, and 90 deg for the orientations B and C. The loading direction is parallel to the c-axis for the orientation E. Plastic anisotropy in a Mg single crystal induces an anisotropically deformed dome shape along a certain direction during the Erichsen test.…”

Section: Deformation and Microstructures Of Pure Magnesiummentioning

confidence: 99%

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Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

142

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Pure magnesium (Mg) develops a strong basal texture after conventional processing of hot rolling or extrusion. Consequently, it exhibits anisotropic mechanical properties and is difficult to form at room temperature. Adding appropriate alloying elements can weaken the basal texture or even change it, but the improvement in formability and mechanical properties is still far from expectations. Over the past 20 years, considerable efforts have been made and significant progress has been made on wrought Mg alloys at the fundamental and technological levels. At the fundamental level, textures formed in sheets and extrusions of different alloy compositions and produced under different strain paths or thermomechanical processing conditions are relatively well established, with the assistance of the advanced characterization technique of electron backscatter diffraction. At the technological level, room temperature formability of sheet has been significantly improved, and tension-compression yield asymmetry of extrusion is also remarkably reduced or eliminated. This paper starts with an overview of dislocations, stacking faults and twins, and deformation of single crystals of pure Mg along different orientations and under different loading conditions, followed by a review of microstructure (texture and grain size) and deformation of polycrystalline pure Mg with different textures, grain sizes, and loading conditions. With this information as a base, texture, grain size, and deformation of polycrystalline Mg alloy sheets and extrusions produced under different processing conditions are systematically examined and compared. Remaining and emerging scientific and technology issues are then highlighted and discussed in the context of texture and grain size. The need for better-resolution diffraction and spectroscopy techniques is also discussed in the relationship between texture change and grain boundary solute segregation.

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Section: Deformation and Microstructures Of Pure Magnesiummentioning

confidence: 99%

Section: Deformation and Microstructures Of Pure Magnesiummentioning

confidence: 99%

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Nie

Shin

Zeng

2020

Metall Mater Trans A

142

View full text Add to dashboard Cite

show abstract

“…It should be noted that the PTR scheme or the VFT scheme is incorporated along with other twinning criterion so as to include a physical twin in a simulation domain. -stress response for the materials system that involves deformation from twinning -predicts texture evolution using predominant twin system 2 VFT scheme [6,130,[185][186][187] -discrete orientation space and texture evolution driven by volume fraction transfer -capable of predicting more accurate texture evolution…”

Section: Othersmentioning

confidence: 99%

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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“…In addition, when the temperature, strain rate, and plastic strain are simultaneously satisfied to a critical value, the dynamic recrystallization (DRX) would be correspondingly activated [ 6 , 7 , 8 ]. Particularly, when conducting dynamic compression deformation behavior under a simultaneously high temperature and high strain rate, the deformation mechanisms of non-basal slip and twinning are unusual, resulting in a confounding, conflicting, and mechanistically unexplained phenomenon connected to the anisotropy mechanical properties of wrought AZ31 magnesium alloy with strong

texture [ 9 , 10 , 11 ]. Hence, uncovering the evolution of non-basal slip, twinning, and DRX mechanisms is thus the key issue regarding the weak anisotropy mechanical properties of wrought AZ31 magnesium alloy with a strong

texture during dynamic compression deformation under high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependency on the Microscopic Mechanism in the Normal Direction of Wrought AZ31 Sheet under Dynamic Compressive Behavior

Sun¹,

Sun²,

Zhang

et al. 2021

Materials

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In order to analyze the competitive relationship of different deformation mechanisms in wrought AZ31 magnesium alloy, the dynamic compressive experiments were conducted by a Split Hopkinson Pressure Bar (SHPB) apparatus and a resistance-heated furnace in the range of temperature between 20 and 350 °C at the strain rate of 1000 s−1. With the help of Electron Backscattered Diffraction (EBSD) observation, theoretical calculated Schmid Factor (SF), Critical Resolved Shear Stress (CRSS), and critical equivalent stress (σ0.2), the dynamic compressive deformation behavior and corresponding mechanism of wrought AZ31 magnesium alloy along the normal direction (ND) were revealed in the current study. The results demonstrate that the c-axis of grains are gradually reoriented parallel to the normal direction of wrought AZ31-ND sheet with the temperature increasing, except the dynamic recrystallization (DRX) mechanism was activated or grains grew up. The non-basal slip and 101¯2 tension twinning are respectively the predominant deformation mechanisms at lower temperatures (≤250 °C) and higher temperatures (≥250 °C). The predominant type of DRX mechanism of wrought AZ31-ND sheet is rotational dynamic recrystallization (RDRX), which is regarded as an obstacle for the kernel misorientation concentration region enhancement.

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Crystal plasticity FEM study of twinning and slip in a Mg single crystal by Erichsen test

Cited by 22 publications

References 67 publications

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

Microstructure, Deformation, and Property of Wrought Magnesium Alloys

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

Temperature Dependency on the Microscopic Mechanism in the Normal Direction of Wrought AZ31 Sheet under Dynamic Compressive Behavior

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