Deformational behavior of face-centered cubic (FCC) phase in high-pure titanium

Bai, Fengmei; Yin, Lei; Wei, Zhao; Zhou, Hongwei; Song, Meng; Yan-chun, Liu; Li, Xianghua

doi:10.1016/j.msea.2020.140287

Cited by 19 publications

(5 citation statements)

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“…The previous literature reports show that the FCC phase in pure-Ti is Ti-H hydride, not FCC-Ti [33][34][35]. In our previous work [21], it is found that FCC phase has better plasticity than HCP-Ti, and FCC phase can reverse to HCP phase during deformation. If the FCC phase is Ti-H hydride, its plasticity will be poor.…”

Section: Tem Observationsmentioning

confidence: 80%

“…The phase transition from HCP to FCC expands the volume of unit cell~10.5%, and it is expected that the phase transition contributes about 3.6% to the applied strain. Bai et al [21] considered that in the rolling process of high purity titanium, apart from twinning [22][23][24] and dislocation mechanism [25], the HCP-FCC phase transition has an important contribution to its elongation process. These show that the HCP-FCC phase transition can occur easily when pure titanium undergoes large plastic deformation at room temperature, which coordinates the deformation.…”

Section: Introductionmentioning

confidence: 99%

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Study on Phase Transformation Orientation Relationship of HCP-FCC during Rolling of High Purity Titanium

et al. 2021

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High purity titanium (Ti) thin strip was prepared by rolling with large deformation and was characterized by the means of Transmission Electron Microscopy (TEM), selected area diffraction (SAED) pattern, high-resolution (HRTEM) analysis, as well as Transmission Kikuchi Diffraction (TKD). It is found that there are face-centered cubic (FCC) Ti laths formed within the matrix of hexagonal close packing (HCP) Ti. This shows that the HCP-FCC phase transition occurred during the rolling, and a specific orientation relationship (OR) between HCP phase and FCC phase obeys ⟨0001⟩α// ⟨001⟩FCC and {100}α//{110}FCC. The ORs of HCP-FCC phase transition are deeply studied by TKD pole figure and phase transformation matrix. It is found that the derived results via pole figure and transformation matrix are equivalent, and are consistent with TEM-SAED analysis results, which proves that these two methods can effectively characterize the ORs of HCP-FCC phase transition and predict possible FCC phase variants.

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Section: Tem Observationsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Study on Phase Transformation Orientation Relationship of HCP-FCC during Rolling of High Purity Titanium

et al. 2021

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“…Initially, both Ti and Al have face-centered cubic (FCC) crystal structures with a lattice constant of 4.340 and 4.046 Å, respectively. It is noted that the FCC Ti structure has been proven to exist via the Gibbs free energy, the first principal calculation, and the transmission electron microscopy experiment in some specific environments [40][41][42][43]. Such a structure has been successfully implemented in our previous studies [11,32] and is reasonable to be applied for the core-shell NP models.…”

Section: Modeling Of Stacked Core-shell Npsmentioning

confidence: 92%

Molecular Dynamics Study of Melting Behavior of Planar Stacked Ti–Al Core–Shell Nanoparticles

Zhang

Han

et al. 2022

J. Compos. Sci.

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Selective laser sintering (SLS) is one of the most commonly used methods in additive manufacturing, due to its high prototyping speed and applicability to various materials. In the present work, molecular dynamics (MD) simulations were performed to study the thermodynamic behaviors of the planar stacked nanoparticles (NPs) model and explore the potential capability of the SLS process with nano-sized metal powders in the zero-gravity space environment. A multi-particle model of titanium–aluminum (Ti–Al) core–shell NP with a particle radius of 50 Å was constructed to investigate the characteristics of the melted pattern during sintering. Two patterns with different spatial densities were considered to study the influence of particle stacking on the melting process. Various core volume fractions and heating rates were examined to investigate their effects on the quality of the final sintered product. The stacked-NPs models with core volume fractions (CVFs) of 3%, 12%, and 30% were linearly heated up to 1100 K from room temperature (298 K) with heating rates of 0.04, 0.2, 0.5, and 1.0 K ps−1. The initial fusion temperature and final sintering temperature for each stacking pattern were obtained via the validation from the radial distribution function, mean squared displacement, and the radius of the gyration analysis. The 30% CVF yields the largest neck size before the melting point, while beyond the melting point, a larger core helps delay the formation of the fully-melted products. It is observed that using the close-packed stacked-NPs model under a slow heating rate (long melting duration) would help form a stable, completely sintered product with a relatively low final sintering temperature.

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“…Transmission electron microscopy (TEM) was used to prove the FCC structure of Ti and the properties of the metal and its structural stability were obtained by first-principles calculations [37]. TEM results also showed that FCC Ti has an excellent tendency for various deformation modes, such as shearing, bending, kinking, and their combinations in annealed samples [38]. Since all core sizes studied in the present work are within the suitable range of nanoscale particle sizes and sintered temperatures, the FCC crystal structure (lattice constant: 4.340 Å) was selected for Ti in this work, which is consistent with the reported observations above.…”

Section: Simulation Detailsmentioning

confidence: 99%

Sintered Ti/Al core/shell nanoparticles: computational investigation of the effects of core volume fraction, heating rate, and room-temperature relaxation on tensile properties

Zhang¹,

Jeon²,

Rahmani³

et al. 2021

J. Phys. D: Appl. Phys.

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Deformational behavior of face-centered cubic (FCC) phase in high-pure titanium

Cited by 19 publications

References 50 publications

Study on Phase Transformation Orientation Relationship of HCP-FCC during Rolling of High Purity Titanium

Study on Phase Transformation Orientation Relationship of HCP-FCC during Rolling of High Purity Titanium

Molecular Dynamics Study of Melting Behavior of Planar Stacked Ti–Al Core–Shell Nanoparticles

Sintered Ti/Al core/shell nanoparticles: computational investigation of the effects of core volume fraction, heating rate, and room-temperature relaxation on tensile properties

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