Interdiffusion in &amp;beta; Phase of the Ternary Ti-Al-V System

Takahashi, Tomoshi; Minamino, Yoritoshi; Komatsu, Masaaki

doi:10.2320/matertrans.mra2007110

Cited by 32 publications

(13 citation statements)

References 24 publications

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“…Chemical interdiffusion experiment for diffusion in b Ti-V were also performed by Ugaste and Zakykin, [61] Fedotov et al [62] and Sprengel et al [63] Furthermore, the impurity diffusion coefficient for V diffusion in b-Ti as well as interdiffusion coefficients in the Ti-V binary evaluated using the forward-simulation analysis were recently published by Zhu et al [64] Diffusion in the b-phase in the ternary Ti-Al-V system has been studied experimentally using diffusion couples. [65,66] In addition to Huang et al's ternary CALPHAD mobility description, [43] Wang et al [67] published a mobility description of the b phase. Two different thermodynamic descriptions were used for the two assessments and hence, the resulting mobility parameters are quite different.…”

Section: Determination Of Diffusion Coefficients From Experimental Datamentioning

confidence: 99%

Diffusion in the Ti-Al-V System

Lindwall

Moon

Chen

et al. 2018

J. Phase Equilib. Diffus.

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Diffusion in the Ti-Al-V system is studied and a CALculation of Phase Diagrams (CALPHAD) diffusion mobility description is developed. Diffusion couple experiments are performed to obtain diffusion paths in the hcp phase at 923 K, 1023 K and 1123 K. The diffusion coefficient of V in the hcp-Ti phase is found to decrease with increasing Al alloying. A forward-simulation analysis is used to evaluate the impurity diffusion coefficient for Al and V diffusion in the hcp Ti-V and the Ti-Al systems which are used as input in the mobility modeling. The composition dependency for the diffusion in the hcp phase in the ternary system is accounted for and a CALPHAD diffusion mobility description is obtained by directly optimizing the mobility parameters as a function of the experimental composition profiles from the diffusion couples. Both experimental data and previous diffusion mobility descriptions in the literature for the bcc Ti-Al-V phase are adopted. A complete description of diffusion in both the hcp and bcc phases for the Ti-Al-V system is presented with the aim to be used for design of Ti alloys and processes. Keywords CALPHAD Á diffusion couples Á diffusion modeling Á interdiffusion Á Ti-Al-V This invited article is part of a special issue of the Journal of Phase Equilibria and Diffusion in honor of Prof. Zhanpeng Jin's 80th birthday. The special issue was organized by Prof. Ji-Cheng (JC) Zhao,

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Section: Determination Of Diffusion Coefficients From Experimental Datamentioning

confidence: 99%

Diffusion in the Ti-Al-V System

Lindwall

Moon

Chen

et al. 2018

J. Phase Equilib. Diffus.

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“…It is easy to see, that both interdiffusion coefficients agree pretty well with experimental data. Takahashi et al [32] also provided values of interdiffusion coefficients in ternary Al -Ti -V BCC_A2 alloy; however, due to 52 wt% V at 1227 K for 172800s superimposed with data given by Siemiatin [32].…”

Section: Resultsmentioning

confidence: 94%

“…The information about kinetic properties in ternary Al -Ti -V BCC_A2 are very limited, as it was written in a literature part. The ternary interaction parameters listed in Table 2 were obtained from data reported by Takahashi et al [32] who provided values of impurity diffusion coefficients in ternary alloys as well as interdiffusion coefficients in ternary alloys at 1373 K and at 1473 K. Figure 8 shows calculated impurity diffusion coefficient of V in Ti -Al BCC_A2 phase, as well as Al in Ti -V BCC_A2 as a function of concentration at 1573 L and 1373 K superimposed with data given by Takahashi et al [32]. It is easy to see, that both interdiffusion coefficients agree pretty well with experimental data.…”

Section: Resultsmentioning

confidence: 99%

“…The information about ternary diffusion in Ti-rich alloys of Al -Ti -V system is very limited. Takahashi et al [32] determined interdiffusion in Ti BCC_A2 phase by aid of concentration profile method at 1373 K and at 1473 K. Moreover, Siemiatin et al [33] proposed diffusion coefficients for particular Ti-6Al-4V alloy based on experiment done at 1227 K, 1172 K, and at 1116 K.…”

Section: Literature Reviewmentioning

confidence: 99%

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Atomic mobility in Titanium grade 5 (Ti6Al4V)

Gierlotka

Lothongkum

Lohwongwatana

et al. 2019

J min metall B Metall

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Titanium grade 5 (Ti6Al4V) is a modern material that can be found in a wide spectrum of applications, from medicine to aircraft industry. The commercial alloy is a mix of a body centered cubic structure (BCC_A2) and a hexagonal closed packed structure (HCP_A3). It is obvious, that heat treatment of the alloy will change a ratio between BCC_A2 and HCP_A3 and, as a consequence, properties of a material. Information about mobility of atoms in both crystal structures allows simulations and predictions of structures' behavior during the heat treatment and diffusion. In this work the atomic mobility in liquid, BCC_A2, and HCP_A3 phases of ternary alloy Al-Ti-V were obtained based on available literature information. Comparison between simulations and experiments shows a good agreement, hence it can be concluded that proposed set of kinetic parameters can be used for predictions and simulations of Titanium grade 5 heat treatment.

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“…This paradox can be resolved by considering the interactions between alloying elements. For example, Takahashi et al [22] showed that Al can decrease the diffusion of V in beta Ti alloys. The faster diffusion of Al in Ti, which is due to its smaller atomic radius (125 pm), decreases the diffusivity of larger atoms such as V (r = 135 pm), Mo (r = 145 pm) and Fe (r = 140 pm) and even self Ti (r = 140 pm).…”

Section: Flow Softening and Ductility At Low Temperaturesmentioning

confidence: 99%

Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing

Abbasi¹,

Momeni²,

Daraee³

et al. 2017

Archives of Metallurgy and Materials

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Hot tensile tests were carried out on Timetal-125 and Timetal-LCB near beta Ti alloys at temperatures in range of 600-1000°C and constant strain rate of 0.1 s -1 . At temperatures below 700-800°C, the homogenuous and total strains for Timetal-LCB were greater than those for Timetal-125. In contrast, at temperatures over 800°C, Timetal-125 showed better hot ductility. The yield point phenomena was observed in Timetal-LCB at all temperatures. Unlikely, for Timetal-125, it was observed only at temperatures over 800°C. The weaker yield point phenomena in Timetal-125 could be attributed to the negative effect of Al on the diffusion of V. At all temperatures Timetal-LCB exhibited higher strength than Timetal-125. It was found that there should be a direct relationship between the extent of yield point phenomena and strength and dynamic softening through hot tensile testing. It was observed that at temperatures beyond 800°C (beta phase field in both alloys) dynamic recrystallization can progress more in Timetal-125 than in Timetal-LCB. These results were in good agreement with the better hot ductility of Timetal-125 at high temperatures. At low temperatures, i.e. below 700-800°C, partial dynamic recrystallization occurs in beta and dynamic globularization in alpha phase. These processes progress more in Timetal-LCB than in Timetal-125.

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Interdiffusion in β Phase of the Ternary Ti-Al-V System

Cited by 32 publications

References 24 publications

Diffusion in the Ti-Al-V System

Diffusion in the Ti-Al-V System

Atomic mobility in Titanium grade 5 (Ti6Al4V)

Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing

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