Introduction

Lütjering, G.; Williams, James C.

doi:10.1007/978-3-540-71398-2_1

Cited by 133 publications

(207 citation statements)

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“…The effect of Al is not fully understood yet since there is still an ongoing debate in literature about the effect of Al to twinning [28][29][30][31][32][33]. Some references claim that Al addition is effective in suppressing twinning [28][29][30]. Williams et al [28] observed that the frequency of twinning rapidly decreases when the Al content increases to 5% and 6.6% from 1.4% and 2.9%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Another texture comparison is made through comparing the < 001 >, < 100 > and < 101 > PFs at 20% compressive strain as shown in Figure 6. [30] ∼200 MPa ∼200 MPa ∼800 MPa --Shahba and Ghosh [46] 230 The critical resolved shear stress (CRSS) value is different in this study [46] since the authors modeled two pyramidal < c + a > slip systems (1st and 2nd order). Optimum Design Figure 6.…”

Section: Optimization Of Slip System Parameters For Ti-7almentioning

confidence: 99%

“…These complexities are mostly because of the crystallographic nature of the alpha (α) phase and addition of alloying elements such as Aluminum (Al) [28]. The effect of Al is not fully understood yet since there is still an ongoing debate in literature about the effect of Al to twinning [28][29][30][31][32][33]. Some references claim that Al addition is effective in suppressing twinning [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, twinning is commonly observed in Ti and other metals with an HCP crystal structure, and it has a strong effect on the overall behavior of a polycrystal material [27]. The deformation behavior of HCP-Ti and Ti alloys has been studied in literature extensively [26][27][28][29][30][31][32][33]. These studies revealed that the Ti alloys have complex slip and twinning modes.…”

Section: Introductionmentioning

confidence: 99%

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Crystal Plasticity Modeling and Experimental Validation with an Orientation Distribution Function for Ti-7Al Alloy

Acar

Ramazani

Sundararaghavan

2017

Metals

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An orientation distribution function based model is used for micromechanical modeling of the titanium-aluminum alloys, Ti-0 wt % Al and Ti-7 wt % Al, which are in demand for many aerospace applications. This probability descriptor based modeling approach is different than crystal plasticity finite element techniques since it computes the averaged material properties using upper bound averaging. A rate-independent single-crystal plasticity model is implemented to compute the effect of macroscopic strain on the polycrystal. An optimization problem is defined for calibrating the basal, prismatic, pyramidal slip system and twin parameters using the available tension and compression experimental data. The crystal plasticity parameters of Ti-7 wt % Al are not studied extensively in literature, and therefore the optimization results for the crystal plasticity model realization produce unique data, which will be beneficial to future studies in the field. The sensitivities of the slip and twin parameters to the design objectives are also investigated to identify the most critical slip system parameters. Using the optimum design parameters, the microstructural textures, during the tension test, are predicted by the crystal plasticity finite element simulations, and compared to the available experimental texture and scanning electron microscope-digital image correlation data.

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Section: Introductionmentioning

confidence: 99%

Section: Optimization Of Slip System Parameters For Ti-7almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystal Plasticity Modeling and Experimental Validation with an Orientation Distribution Function for Ti-7Al Alloy

Acar

Ramazani

Sundararaghavan

2017

Metals

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“…This is due to pyramidal <c+a> slip having a critical resolved shear stress at room temperature about 3-5 times higher than for prismatic <a> slip [4][5][6]. in the absence of easy slip including a <c> component, twinning is commonly observed in Ti and other metals with an hcp crystal structure.…”

Section: Introductionmentioning

confidence: 97%

Proceedings of the 13th World Conference on Titanium

2016

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Twin formation in alpha-Ti is a topic of much debate as the role of microstructure features and alloy chemistry on twin formation remains unclear. In the present work, early stage of twin formation, i.e. after 1% plastic compression, has been studied in 3D using diffraction contrast tomography. This technique has enabled to study a volume about 400 grains enabling statistical analysis. The family of twinned grains was compared with similarly orientated grains that had not twinned in respect of their neighbourhood and grain size. While the initial neighbourhood analysis did not identify any significant differences, 3D grain size analysis highlighted that grain size plays an important role during the early stage of twinning. Further, twin clusters/chains were identified, which form slightly imperfect 3D networks. A more detailed neighbourhood analysis of the parent grains associated with the twin clusters/chains demonstrate that strain localization in neighbouring grains well aligned for prismatic slip transfer promote the observed twin clustering.

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Microstructure of α' Martensites in Ti‐V‐Al Alloys Studied by High‐Resolution Transmission Electron Microscopy

Sato¹,

Matsumoto²,

Chiba³

et al. 2012

Supplemental Proceedings

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Atomic structures of hexagonal α' martensites in Ti-6mass%Al-4mass%V alloys have been studied by means of aberration corrected high-resolution transmission electron microscopy and electron diffraction. There observed differences in atomic structures of the } 1 1 10 { -type twin boundaries of the α' martensites: stacking faults, a few atomic layers in width, was observed at the twin boundary for the as-quenched alloy after solution treatment at 1100 o C (above the β transus), while the alloy solution treated at 950 o C (below the β transus) showed a clear-cut twin boundary. The excellent ductility is observed in the latter alloy.

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Introduction

Cited by 133 publications

References 0 publications

Crystal Plasticity Modeling and Experimental Validation with an Orientation Distribution Function for Ti-7Al Alloy

Crystal Plasticity Modeling and Experimental Validation with an Orientation Distribution Function for Ti-7Al Alloy

Proceedings of the 13th World Conference on Titanium

Microstructure of α' Martensites in Ti‐V‐Al Alloys Studied by High‐Resolution Transmission Electron Microscopy

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