Superplasticity of an Ultrafine-Grained Ti–4% Al–1% V–3% Mo Alloy

Котов, А. Д.; Mikhailovskaya, A. V.; Mosleh, Ahmed O.; Pourcelot, Theo; Prosviryakov, A. S.; Портной, В. К.

doi:10.1134/s0031918x18100083

Cited by 20 publications

(21 citation statements)

References 38 publications

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“…The both VT6 (figures 3(a)-(c)) and OT4-1 (figures 3(d)-(f)) alloys are characterized predominantly by a strain hardening, while the VT14 alloy (figures 3(g)-(h)) is mostly characterized by a strain softening. A similar characterization was noted for VT6 and OT4-1 alloys in [37,39,40], and for VT14 alloy in [19,41].…”

Section: Determination Of the Microstructure Parameterssupporting

confidence: 78%

“…Thus, this behaviour can be explained by competition between dynamic recrystallization and dynamic grain growth. It is notable that a dynamic grain growth was less pronounced in VT14 comparing to the other alloys, but its' grains were also grown at deformation [19,41]. Firstly, dynamic recrystallization kinetics raises and the phenomenon required less time/strains with increasing temperature and decreasing strain rate.…”

Section: Uniaxial Tensile Tests Resultsmentioning

confidence: 95%

“…The dog-bone flat samples according to ASTM E2448-18 standard were cut in the rolling direction, then tested via a Walter-Bay LFM100 test machine (Walter+Bai AG, Löhningen, Switzerland). The superplastic strain rate for each alloy were determined in [19,37,38]. The stress-strain data of each alloy were utilized to build up the proposed models.…”

Section: Materials and Test Experimentsmentioning

confidence: 99%

“…(1) parameters related to the deformation process such as the deformation temperatures and strain rates [10,13]. (2) parameters related to the microstructure of investigated alloy such as alloy chemistry, grain growth kinetics, grain size distribution, grain aspect ratio, volume fraction of phases and texture [14][15][16][17][18][19][20]. The influence of the both deformation temperature and strain rate on the elongation to failure and strain-hardening coefficient of the VT6, OT4-1 and VT14 alloys was studied in [10].…”

Section: Introductionmentioning

confidence: 99%

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Modelling approach for predicting the superplastic deformation behaviour of titanium alloys with strain hardening/softening characterizations

Mosleh

Mestre-Rinn

Khalil

et al. 2019

Mater. Res. Express

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This paper introduces an approach for modelling the flow behaviour of different titanium alloys (VT6, OT4-1 and VT14 alloys by Russian specifications) in superplastic deformation temperature and strain rate ranges. The initial microstructure parameters (d V , , , a b a b ) before starting the deformation test were included in the constructed model for each alloy. The investigated alloys have different initial microstructures and flow behaviour characteristics. The isothermal uniaxial tensile deformation tests were performed at the superplastic deformation temperature and strain rate ranges of each alloy. The VT6, OT4-1 alloys were characterized by strain hardening effect during the deformation test, while VT14 alloy was characterized by strain softening effect. A comparison study between the experimental and modelled data was performed. The general equation of the constructed models was affected by the flow behaviour of the investigated alloys. The comparison results proved the good capability of the constructed models to predict the flow behaviour of the studied alloys. The correlation coefficient R was 0.98, 0.95 and 0.97 for VT6, OT4-1 and VT14, respectively. The predictability of the constructed model was assessed by the cross-validation technique, which ascertained the quality of the constructed model.

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Section: Determination Of the Microstructure Parameterssupporting

confidence: 78%

Section: Uniaxial Tensile Tests Resultsmentioning

confidence: 95%

Section: Materials and Test Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling approach for predicting the superplastic deformation behaviour of titanium alloys with strain hardening/softening characterizations

Mosleh

Mestre-Rinn

Khalil

et al. 2019

Mater. Res. Express

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show abstract

“…The superplasticity might also arise in high strain rates even >10 4 s -1 (high strain-rate superplasticity) [16,28]. The aforementioned conditions allow the superplastic behavior of a material to be defined [18] as a complex function of the strain rate () , strain ( ) , temperature ( ) and the grain size ( ) (Eq. 1)…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Superplastic Punchless Deep Drawing Process of a Ti-6Al-4V Titanium Alloy

Skrzat¹,

Wójcik²

2020

Adv. Sci. Technol. Res. J.

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The numerical results of superplastic punchless deep drawing of the Ti-6Al-4V titanium alloy were presented in this paper. The material behavior subjected to the forming process was characterized by deformation-microstructure constitutive equations including the grain growth. Superplastic stress-strain characteristics used in the numerical simulations were computed with the application of authorial program. The explicit integration scheme is used in solving differential equations. The numerical simulations of the super-elastic deep drawing were made with finite element method analysis. The von Mises stress distribution in the blow-forming process was obtained. The possible faults of extrusions caused by the improper load history as well as unsuitable pressure were also presented in this paper. The numerical simulations included in this research allow for the proper choice of material and drawing parameters which can help to optimize the superplastic forming process.

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