In situ neutron measurements and modelling of the intergranular strains in the near-β titanium alloy Ti-β21S

Hounkpati, Viwanou; Fréour, Sylvain; Gloaguen, David; Legrand, Vincent; Kelleher, Joe; Kockelmann, W.; Kabra, Saurabh

doi:10.1016/j.actamat.2016.02.065

Cited by 41 publications

(32 citation statements)

References 39 publications

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“…As a consequence, the correlation between neighbor grains due to the vicinity effect is completely disregarded. It is a reasonable assumption and works well for single phase materials [1][2][3][5][6][7] and two-phase alloys that do not have orientation relationship between phases [14,28]. However, the correlation in morphology and orientation between grains of different phases is strong for lattice-coherent two-phase materials, which cannot be neglected.…”

Section: Modelingmentioning

confidence: 99%

“…In situ neutron diffraction is used to quantify the evolution of lattice structure within the bulk of many polycrystalline metals. It has provided the foundation of numerous research on polycrystals with various crystalline structures [1][2][3][4][5][6][7][8] and phase components [9][10][11][12][13][14][15]. These in situ deformation studies have revealed the heterogeneous stress and strain accommodation within polycrystalline aggregates.…”

Section: Introductionmentioning

confidence: 99%

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Accounting for lattice coherency in a two-phase elastic-plastic self-consistent model for nickel-based superalloys

Ekh

Colliander

et al. 2018

International Journal of Plasticity

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Ekh, M., Hörnqvist Colliander, M. et al (2018) Accounting for lattice coherency in a two-phase elastic-plastic self-consistent model for nickel-based superalloys International Journal of Plasticity, 110: 248-271 http://dx. AbstractA 2-site elastic-plastic self-consistent (EPSC) model is developed and implemented in order to account for crystallographic texture development and grain morphology evolution under strong correlations between neighbor grains of different phases, both in space and orientation. Predictions of the model adequately fit the published in situ neutron diffraction data for nickel-based superalloys at ambient and elevated temperatures, in which γ and γ phases exhibit exact cube-cube orientation relationship. Comparison with 2-site model (small strain algorithm, non-rotation scheme) and 1-site model (finite strain algorithm, co-rotation scheme) has been made, and the result shows that the present 2-site model (finite strain algorithm, rotation scheme) leads to better predictions in lattice strain evolution where both rotation of crystal lattice and correlation between inclusions are accounted for, especially when the applied strain is larger than 0.02 for transverse direction and 0.05 ∼ 0.18 for axial direction for the materials studied in this work. Based on a systematic study on the effects of grain-grain interaction and total grain number on the homogenized results, we found that transverse lattice strains of γ (200) and/or γ (100) are sensitive to the interplay between γ-γ interaction and evolution of grain orientation distribution with deformation, while that of γ (220) and γ (110) are sensitive to the initial crystallographic texture.

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Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accounting for lattice coherency in a two-phase elastic-plastic self-consistent model for nickel-based superalloys

Ekh

Colliander

et al. 2018

International Journal of Plasticity

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“…The properties of that material are often drastically modified and new properties can then be studied. These properties could change when a material is subjected to severe environmental conditions of low or high temperatures [1,2], often coupled to a second stress such as an intense magnetic field, a light irradiation [3,4], a mechanical stress [5,6], or a high pressure [7,8]. Under these extreme conditions, the studied material undergoes important physical and/or chemical modifications, often leading to the appearance of phase transitions [9,10] or metastable states.…”

Section: Introductionmentioning

confidence: 99%

Durability of Composite Materials under Severe Temperature Conditions: Influence of Moisture Content and Prediction of Thermo-Mechanical Properties During a Fire

2019

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The main objective of the present study was to develop a fire thermal model able to predict the evolution of the temperature and decomposition gradient across a laminated composite structure when exposed to fire. The thermal response of composite laminate made of organic polymer matrix was investigated under severe temperature conditions as samples were exposed to high temperatures up to 750 °C. The highlight is that a behavior law for water is included in our thermo-mechanical model to estimate effects due to a moisture content field on the thermal response of composite laminates. In particular, porosity and gas pressure are strongly influenced by the presence of water in the material and modify the thermal behavior accordingly. This enabled us to propose a new approach that can be used for the prediction of hygro-thermo-chemico-mechanical post-combustion properties in a very large number of material and fire scenarios.

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“…The main advantage of the diffraction methods is that the measurements are performed selectively only for the crystallites contributing to the measured diffraction peak. When several phases are present in the sample, measurements of a separate diffraction peak allows for investigating the behaviour of each phase independently [15][16][17][18][19][20][21][22][23][24][25]. A comparison of the diffraction data with micromechanical models is very convenient for the study of elastoplastic properties at micro and macro scales.…”

Section: Introductionmentioning

confidence: 99%

“…To observe the mechanical behaviour inside both phases during the damage process, diffraction measurements combined with an in situ tensile test were performed [15][16][17][18][19][20][21][22][23][24][25]. The main advantage of the diffraction methods is that the measurements are performed selectively only for the crystallites contributing to the measured diffraction peak.…”

Section: Introductionmentioning

confidence: 99%

Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking

et al. 2017

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In situ neutron measurements and modelling of the intergranular strains in the near-β titanium alloy Ti-β21S

Cited by 41 publications

References 39 publications

Accounting for lattice coherency in a two-phase elastic-plastic self-consistent model for nickel-based superalloys

Accounting for lattice coherency in a two-phase elastic-plastic self-consistent model for nickel-based superalloys

Durability of Composite Materials under Severe Temperature Conditions: Influence of Moisture Content and Prediction of Thermo-Mechanical Properties During a Fire

Stress distribution correlated with damage in duplex stainless steel studied by synchrotron diffraction during plastic necking

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