Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy

George, Alphy; Divakar, R.

doi:10.1016/j.micron.2019.03.003

Cited by 9 publications

(9 citation statements)

References 34 publications

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“…And in Figure e, the streaks are elongated at a projected angle of 0° with respect to [1̅10], so the contrast-modulated lamella in Figure d is oriented along [1̅00]. As a result, Figure reveals that the contrast-modulated lamellas appear along the ⟨100⟩ direction, which is the elastically soft direction in the cubic system, and this result is similar to the earlier reported findings on the Ti–Mo alloy system …”

Section: Resultssupporting

confidence: 85%

“…The streaking of the diffraction spots appearing in the power spectrum in Figure c,e shows that there is variation in d -spacing across the two-phase lamella. It means that β1 and β2 phases have the same crystal structure, but the only difference is lattice parameter, which is reported for other alloy systems as well. ,, …”

Section: Discussionsupporting

confidence: 54%

“…The phase separation phenomenon has been observed in Ti alloys such as Ti–V, Ti–Mo, Ti–Cr, and other systems as well. ,, The solution-treated cold-rolled Ti–Mn alloy when examined in conventional TEM, contrast-modulated lamella was observed, which is the key feature of phase separation . The contrast-modulated lamella consists of alternating bright and dark regions corresponding to (β1) and (β2) phases, respectively.…”

Section: Discussionmentioning

confidence: 94%

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Probing Nanoscale Phase Separation at Atomic Resolution within β-Type Ti–Mn Alloy: A Potential Candidate for Biomedical Implants

Banerjee

Roy

Gepreel

et al. 2019

ACS Biomater. Sci. Eng.

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Biocompatible β-type Ti alloys with high ultimate tensile strength (UTS) and yield strength are potential candidates for certain orthopedic and cardiovascular implants. Aiming for these applications, Ti alloy with 14 wt % Mn (Ti–14 Mn) as β-stabilizer was processed through thermomechanical treatment along with solutionizing and quenching, followed by 95% cold rolling, which resulted in ultrahigh UTS and yield strength. 3-[4,5-Dimethylthiazol-2-yl]-2,5-diphenyltetrazolimbromide assay with different cell lines suggests efficient cell growth on alloy surface without compromising biocompatibility. Cell adhesion and spreading assay show that cells are not only able to attach to the alloy surface but also able to spread and grow with normal morphology, which projects this material as a potential candidate for biomedical application. Previous studies on binary β-type Ti alloy systems treated with the above-mentioned processing route confirm the presence of nanoscale phase separation, which enhances its mechanical properties. To discover the same phenomena in the alloy of the present study, bright-field and high-resolution transmission electron microscopy (HRTEM) imaging experiments were performed and nanoscale contrast-modulated lamella regions were observed. Geometrical phase analysis on complex-valued exit wave, reconstructed using focal series HRTEM images, demonstrates that the lamella is a result of d-spacing modulation. Ab initio calculation indicates that d-spacing modulation with the same crystal structure occurs due to composition modulation and was proved by scanning transmission electron microscopy imaging coupled with quantitative energy-dispersive X-ray spectroscopy. Correlating contrast, strain, and composition modulation confirms nanoscale phase separation, which is the first report of this phenomenon in Ti–Mn alloy system.

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Section: Resultssupporting

confidence: 85%

Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 94%

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Probing Nanoscale Phase Separation at Atomic Resolution within β-Type Ti–Mn Alloy: A Potential Candidate for Biomedical Implants

Banerjee

Roy

Gepreel

et al. 2019

ACS Biomater. Sci. Eng.

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“…Samarantay et al [16] proposed a modification to the ZA model to better describe the behavior of titaniummodified austenitic stainless steel. This model has been used to model titanium alloys and is described in Equation ( 11): (11) in this equation, T * = T − T re f , where T is the current test temperature; T re f is the reference temperature;…”

Section: Modified Zerilli-armstrong Modelmentioning

confidence: 99%

“…It has also been discussed that the omega phase can precipitate in a manner induced by deformation in beta metastable alloys during cold deformation [11], i.e., an increase in the volumetric fraction of the omega phase may occur during deformation. However, no studies were found about quantifying the omega phase in beta metastable alloys under hot deformation.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of a Beta Metastable TMZF Alloy: Microstructural and Constitutive Phenomenological Analysis

Guerra

Jorge

Roche

et al. 2021

Metals

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A metastable beta TMZF alloy was tested by isothermal compression under different conditions of deformation temperature (923 to 1173 K), strain rate (0.172, 1.72, and 17.2 s−1), and a constant strain of 0.8. Stress–strain curves, constitutive constants calculations, and microstructural analysis were performed to understand the alloy’s hot working behavior in regards to the softening and hardening mechanisms operating during deformation. The primary softening mechanism was dynamic recovery, promoting dynamic recrystallization delay during deformation at higher temperatures and low strain rates. Mechanical twinning was an essential deformation mechanism of this alloy, being observed on a nanometric scale. Spinodal decomposition evidence was found to occur during hot deformation. Different models of phenomenological constitutive equations were tested to verify the effectiveness of flow stress prediction. The stress exponent n, derived from the strain-compensated Arrhenius-type constitutive model, presented values that point to the occurrence of internal stress at the beginning of the deformation, related to complex interactions of dislocations and dispersed phases.

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Twinning and 9R Phase Transition Mediated Extraordinary Cold‐drawn Deformability in NiCoCrFeMo High‐Entropy Alloy

Liu,

Wu,

Zheng

et al. 2024

Small

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The production and application of materials are evolving towards the low‐dimensional micro‐nano scale. Nevertheless, the fabrication of micron‐scale alloy fibers remains a challenge. Herein, a novel Ni‐Co‐Cr‐Fe‐Mo high‐entropy alloy (HEA) fiber with a cold‐drawn reduction rate of 99.9995% and a strain (ɛ) of 12.19 is presented without requiring intermediate annealing. The exceptional deformation strain of 11.62 within the fiber leads to extraordinary tensile strengths of 2.8 GPa at room temperature and 3.6 GPa at 123 K. The in‐depth investigation of the microstructure of fibers has revealed the cold drawing deformation mechanisms mediated by the synergistic effects of plane defects. Specifically, various geometrically necessary dislocation interfaces, such as dislocation walls and microbands, along with deformation twins and long‐period 9R structures, form in response to external stress when ɛ≤2.7. As the strain increases, the saturated layered structure emerges and progressively evolves into a 3D equiaxed crystal. Moreover, the formation and evolution of the 9R structure (i.e., the migration of incoherent twin boundaries), coupled with the interaction of partial dislocations and the role of deformation twins, are crucial factors determining the fiber's plastic response. This work provides a novel approach to discovering new high‐strength metallic fibers with excellent deformability through plane defects engineering.

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Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy

Cited by 9 publications

References 34 publications

Probing Nanoscale Phase Separation at Atomic Resolution within β-Type Ti–Mn Alloy: A Potential Candidate for Biomedical Implants

Probing Nanoscale Phase Separation at Atomic Resolution within β-Type Ti–Mn Alloy: A Potential Candidate for Biomedical Implants

Hot Deformation Behavior of a Beta Metastable TMZF Alloy: Microstructural and Constitutive Phenomenological Analysis

Twinning and 9R Phase Transition Mediated Extraordinary Cold‐drawn Deformability in NiCoCrFeMo High‐Entropy Alloy

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