Effect of the oxygen diffusion on the mechanical behavior of Ti–6Al–2Sn–4Zr–2Mo–0.1Si Alloy

Baillieux, Jean; Archambeau, Claude; Emile, Philipe; Poquillon, Dominique

doi:10.1002/9781119296126.ch270

Cited by 3 publications

(6 citation statements)

References 16 publications

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“…Numerous periodical transverse cracks normal to the load direction are observed on the surface of the samples subjected to tensile fracture. The formation of similar cracks is also characteristic of other hotstrength alloys, for example, Ti6242S [9,10,16]. The formation of transverse cracks was found [15] to occur at the initial stage of plastic deformation in tensile tests.…”

Section: Resultsmentioning

confidence: 79%

“…The main parameters of the estimation of the heat resistance of titanium alloys are the thickness of the gas-saturated layer, the weight gain upon annealing, and the material parameters used for the description of oxygen diffusion during oxidation. The behavior during the oxidation of titanium alloys, which can be used at elevated temperatures, was described on the basis of the experimental data [14][15][16][17], and some models for the oxidation and prediction of the deformation behavior of these alloys were proposed.…”

Section: Introductionmentioning

confidence: 99%

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Deformation Behavior of a VT18U Titanium Alloy in the Oxidized State

Kalienko

Ледер²,

Волков³

et al. 2020

Russ. Metall.

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The influence of the isothermal annealing conditions in air (at 560 and 625°C for 1000 h) on the deformation behavior of a high-temperature VT18U titanium alloy under tension is studied. The plasticity of the alloy at room temperature decreases from 14 to ≈5% after annealing at the investigated temperatures. The thickness of the gas-saturated layer is 17 and 42 μm after annealing at 560 and 625°C, respectively. The main factor determining the plasticity of the alloy in the oxidized state is the oxygen content gradient in the gassaturated layer.

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Section: Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of a VT18U Titanium Alloy in the Oxidized State

Kalienko

Ледер²,

Волков³

et al. 2020

Russ. Metall.

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“…Determination of the coefficient of thermal expansion of Ti-alloy as a function of the oxygen content would be beneficial for such stress-state prediction. While the increase in CRSS for all the system variants would normally increase the macroscopic yield strength of the materials [5,6], the gradient of elastic properties [8,11] induced by the oxygen profile could lead to strain concentration and thus early failure owing to the brittle behavior of the ONADZ. Premature cracking due to strain incompatibilities during loading could be a reason of the loss in mechanical strength but needs further documentations.…”

Section: Discussionmentioning

confidence: 99%

“…Reducing the activation volume and enhancing static and dynamic strain aging phenomena [6,7]; 4. Decreasing primary, secondary and tertiary creep rates [7,11]; 5. Increasing the hardness [8,12,13]; 6.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen/nitrogen-assisted embrittlement of titanium alloys exposed at elevated temperature

et al. 2020

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Due to high solubility of oxygen and nitrogen in titanium alloys, the influence of the diffusion zone on the macroscopic tensile properties of pre-oxidized annealed Ti-6Al-4V tensile specimens was examined at room temperature. Thin microtensile specimens were prepared with different thicknesses ranging from 100 µm to 500 µm and then exposed at 750°C for durations between 5 and 200h. A dedicated gripping technique was developed in the present study to investigate the brittleness of such pre-oxidized and ultrathin specimens at room temperature. Tensile testing was paired with digital image correlation techniques to assess both macroscopic deformation and full-field strain maps. High temperature pre-oxidation treatments significantly decreased the ductility of the specimen and the tensile strength of the materials (yield strength and ultimate tensile strength). Fractographic examinations revealed typical brittle fracture features in the oxygen/nitrogen-affected diffusion zone in the periphery of the cross-section while the fracture remained ductile in the core of the specimen for most of the specimens. Some specimens fully failed in a brittle manner for “(pre-ox. duration)1/2/thickness” configurations with ratio equal or higher than 0.45 h1/2.µm-1.

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