Formation of slip bands and microstructure evolution of Ti-5Al-5Mo-5V-3Cr-0.5Fe alloy during warm deformation process

Fan, Jiangkun; Kou, Hongchao; Zhang, Yudong; Germain, Lionel; Hua, Ke; Tang, Luyao; Esling, Claude; Li, Jinshan

doi:10.1016/j.jallcom.2018.08.097

Cited by 28 publications

(7 citation statements)

References 43 publications

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“… 19 However, for titanium alloys shown in the slip region of Figure 3 , the values of e / a̅ vary from 4.03 to 4.62, whereas the values of Δ r̅ vary from −3.5 × 10 –3 to 1.6 × 10 –3 nm ( Tables 2 – 4 ). This reveals that the slip is possible in titanium alloys with e / a̅ values less than 4.20, which has been reported in alloys such as Ti–5Al–5Mo–5V–3Cr–0.5Fe (wt %), 36 Ti–6Mn–3Mo (wt %), 38 Ti–33Zr–3Fe–2Cr (wt %), 25 Ti–5Al–5Mo–5V–3Cr (wt %), 41 Ti–4Al–7Mo–3V–3Cr (wt %), 41 Ti–1Fe (wt %), 26 and Ti–3Fe (wt %). 26 The slip in these alloys possibly occurs due to atomic size misfit which increases the bonding strength between atoms.…”

Section: Results and Discussionsupporting

confidence: 62%

“…Revised e / a̅ versus Δ r̅ diagram considering the results of titanium alloys reported in previous findings. ,− ,− …”

Section: Results and Discussionmentioning

confidence: 91%

“…This suggests that despite comprising e / a̅ values greater than 4.30, these alloys still possess low stacking fault energy to trigger the formation of twin boundaries. It is also worth noting that Ti–10V–4Cr–1Al (wt %) shows twinning at the e / a̅ and Δ r̅ values of 4.32 and −2.4 × 10 –3 nm, respectively, whereas Ti–5Al–5Mo–5V–3Cr–0.5Fe (wt %), Ti–5Al–5Mo–5V–3Cr (wt %), and Ti–4Al–7Mo–3V–3Cr (wt %) show the slip by contrast at the e / a̅ and Δ r̅ values of 4.08 and −1.8 × 10 –3 nm, 4.06 and −1.7 × 10 –3 nm, and 4.08 and −1.5 × 10 –3 nm. These alloys show contrasting results than the conventional limits of e / a̅ and Δ r̅ for twinning in titanium alloys ( e / a̅ < 4.20 and Δ r̅ close to 0 nm) because of using different processing parameters/techniques.…”

Section: Results and Discussionmentioning

confidence: 99%

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Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys

et al. 2021

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A revised semiempirical approach, considering the average values of the valence electron to atom ratio ( e / a̅ ) and a difference in atomic radii of alloying element/s and the base element (Δ r̅ ), is proposed to predict the twin formation in titanium alloys. The revised e / a̅ versus Δ r̅ diagram is plotted, considering the reported results of 90 titanium alloys fabricated using various processing methods. A new twin/slip boundary has been plotted and recommended based on the revised e / a̅ versus Δ r̅ diagram. The conventional maximum limit reported for the twinning in titanium alloys is e / a̅ = 4.20; however, it has been found that twinning in titanium alloys is possible up to the e / a̅ of 4.30.

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Section: Results and Discussionsupporting

confidence: 62%

“…Revised e / a̅ versus Δ r̅ diagram considering the results of titanium alloys reported in previous findings. ,− ,− …”

Section: Results and Discussionmentioning

confidence: 91%

Section: Results and Discussionmentioning

confidence: 99%

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Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys

et al. 2021

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“…This difference in transformation can be related to the difference in electron density; the α + β alloys have <4 el/atom, while β alloys have higher electron density, for example, it is 4.148 el/atom for Ti-15-3 alloy [5]. Beta alloys are more workable because of the higher stacking fault energy of the BCC phase, which supports the formation of multiple and cross slips upon deformation, thereby preventing crack formation [6].…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment of Metastable Beta Titanium Alloys

Soundararajan¹,

Vishnu²,

Manivasagam³

et al. 2021

Welding - Modern Topics

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Heat treatment of metastable beta titanium alloys involves essentially two steps-solution treatment in beta or alpha+beta phase field and aging at appropriate lower temperatures. High strength in beta titanium alloys can be developed via solution treatment followed by aging by precipitating fine alpha (α) particles in a beta (β) matrix. Volume fraction and morphology of α determine the strength whereas ductility is dependent on the β grain size. Solution treatment in (α + β) range can give rise to a better combination of mechanical properties, compared to solution treatment in the β range. However, aging at some temperatures may lead to a low/nil-ductility situation and this has to be taken into account while designing the aging step. Heating rate to aging temperature also has a significant effect on the microstructure and mechanical properties obtained after aging. In addition to α, formation of intermediate phases such as omega, beta prime during decomposition of beta phase has been a subject of detailed studies. In addition to covering these issues, the review pays special attention to heat treatment of beta titanium alloys for biomedical applications, in view of the growing interest this class of alloys have been receiving.

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“…This leads to multiple and cross-plane slips. It makes it very formable, unlike other alloys of Titanium [5]. The result of the heat treatment on the beta alloy will be dependent on the temperature and its composition [4].…”

Section: Introductionmentioning

confidence: 99%

Tensile Flow Behaviour and Fracture Studies of Beta Titanium Alloys at Elevated Temperatures

Rai¹,

Panigrahi²

2021

J Mater Sci Manufac Res

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Tensile testing on metastable beta alloy with various microstructures was carried out in this study. Beta 21S is a metastable alloy that exhibits a wide range of material characteristics depending on the processing techniques used. Three different sheets that have been used in this paper which has the same substance but three different microstructures. At a strain rate of 0.001/s, the tensile test was done on a single sheet at five different temperatures. The sheet has developed varied microstructures, the tensile nature of the material varies the alloy’s characteristics. Mechanical characteristics for 400°C, 500°C, 600°C, and 7000°C are described for 21S sheets. The alpha phase sheet elongated at room temperature by 1-3 %, whereas the pure beta phase sheet elongated by 22-24 %. There is a significant improvement in the extension of the sheet with the variation in temperature for the alpha phase. The elongation of the pure beta phase does not alter as the temperature rises. The fracture surface was tested at all temperatures and the optimal temperature for forming the sheet has been determined

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Formation of slip bands and microstructure evolution of Ti-5Al-5Mo-5V-3Cr-0.5Fe alloy during warm deformation process

Abstract: Formation of slip bands and microstructure evolution of Ti-5Al-5Mo-5V-3Cr-0.5Fe alloy during warm deformation process,

Cited by 28 publications

References 43 publications

Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys

Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys

Heat Treatment of Metastable Beta Titanium Alloys

Tensile Flow Behaviour and Fracture Studies of Beta Titanium Alloys at Elevated Temperatures

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