Phase-field study of the spinodal decomposition rate of β phase in oxygen-added Ti–Nb alloys

Ishiguro, Yuya; Tsukada, Yuhki; Koyama, Toshiyuki

doi:10.1016/j.commatsci.2019.109471

Cited by 22 publications

(3 citation statements)

References 24 publications

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“…In Ti–Nb alloys, certain non-metallic alloying elements affect the course of spinodal decomposition, such as oxygen and nitrogen. Using the phase-field method, Ishiguro et al [ 36 ] investigated the β-phase spinodal decomposition in oxygen-added Ti–Nb alloys simulated at 700–1073 K. The results show that adding low amounts of oxygen remarkably enhances the β-phase spinodal decomposition at high temperatures. The volume fraction and composition of the β1 and β2 phases depend on the heat treatment condition, alloy composition, and oxygen content.…”

Section: Introductionmentioning

confidence: 99%

In-situ investigation of the decomposition process in cold-rolled Nb53Ti47 alloy

Nagy,

Kristaly,

Karpati

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

In-situ investigation of the decomposition process in cold-rolled Nb53Ti47 alloy

Nagy,

Kristaly,

Karpati

et al. 2024

Heliyon

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“…To increase the strength of Ti alloys, interstitial elements such as O, N, and C are typically added, and strength improvements can be expected via the solid solution hardening mechanism [33]. However, studies are not actively being conducted on improving the mechanical properties of alloys by performing crystal grain refinement based on recrystallization via mechanical and thermal processes [34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen on Static Recrystallization Behaviors of Biomedical Ti-Nb-Zr Alloys

Han,

Lee

2024

Metals

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Titanium alloys that are used in biomedical applications must possess biocompatibility and a low elastic modulus so that they protect host bone tissue without causing stress shielding. As the elastic modulus of beta Ti alloys is close to that of bone (10–30 GPa), these alloys are considered potential orthopedic implant materials. The elastic modulus of the single β-phase Ti-39Nb-6Zr (TNZ40) alloy is approximately 40 GPa, whereas the strength is lower than that of other types of Ti alloys. Interstitial oxygen in a Ti matrix is well known to improve the matrix strength by solid-solution hardening. The desired mechanical properties can be optimized using a thermo-mechanical procedure to maintain a low elastic modulus. In order to enhance the strength, TNZ40 alloys were fabricated with different amounts of oxygen. The TNZ-0.16O and TNZ-0.26O alloys were cold swaged into 11 mm diameter bars, subjected to solution treatment at 900 °C and 950 °C for 2 h, and furnace-cooled to room temperature. As a result, recrystallized grains were clearly observed in the β matrix. The TNZ-0.26O alloy that was cold-worked by swaging followed by solution treatment at 900 °C exhibited the best mechanical properties (Vickers hardness: 247 HV, ultimate tensile strength: 777 MPa, elongation at rupture: 18.6%, and compressive strength: 1187 MPa). This study reports the effects of oxygen content on the recrystallization behavior and mechanical properties of these alloys.

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“…Research into the spatial patterns arising from phase transitions and aggregations in polymer systems has been vigorously pursued from both theoretical and experimental perspectives. − Commonly, in first-order phase transitions, − excluding critical phenomena, such as spinodal decomposition − and nucleation and growth, − the spatial scale of the pattern tends to increase, or coarsen, over time. Consequently, transient microscopic patterns evolve during phase separation.…”

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confidence: 99%

Periodic Alignment of Binary Droplets via a Microphase Separation of a Tripolymer Solution under Tubular Confinement

Shono,

Aburatani,

Yanagisawa

et al. 2024

ACS Macro Lett.

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We report the spontaneous formation of a characteristic periodic pattern through the phase separation of a tripolymer solution comprising polyethylene-glycol (PEG)/dextran (DEX)/gelatin. When this tripolymer solution is introduced into a glass capillary with a PEG-coated inner surface, we observe the time-dependent growth of microphase separation. Remarkably, a self-organized, periodic alignment of DEX-and gelatin-rich microdroplets ensues, surrounded by a PEG-rich phase. This pattern demonstrates considerable stability, enduring for at least 8 h. The fundamental characteristics of the experimentally observed periodic alignment are successfully replicated via numerical simulations using a Cahn−Hilliard model underpinned by a set of simple, theoretically derived equations. We propose that this type of kinetically stabilized periodic patterning can be produced across a broad range of phase-separation systems by selecting appropriate boundary conditions such as at the surface within a narrow channel.

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Phase-field study of the spinodal decomposition rate of β phase in oxygen-added Ti–Nb alloys

Cited by 22 publications

References 24 publications

In-situ investigation of the decomposition process in cold-rolled Nb53Ti47 alloy

In-situ investigation of the decomposition process in cold-rolled Nb53Ti47 alloy

Effect of Oxygen on Static Recrystallization Behaviors of Biomedical Ti-Nb-Zr Alloys

Periodic Alignment of Binary Droplets via a Microphase Separation of a Tripolymer Solution under Tubular Confinement

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