Mechanical characterization of Ti–5Al–2.5Sn ELI alloy at cryogenic and room temperatures

Ghisi, Aldo; Mariani, Stefano

doi:10.1007/s10704-007-9140-z

Cited by 22 publications

(8 citation statements)

References 42 publications

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“…Moreover, microvoid coalescence is the dominant fracture mode in all the tensile samples. It was reported that the Ti–5Al–2.5Sn extra-low-interstitial (ELI) alloy has excellent ductility, and the dimple morphology appears in the fracture surface when the testing temperature is as low as 8 K [ 2 ]. Also, a similar ductile fracture mechanism for Ti–5Al–2.5Sn alloy subjected to tension loadings can be found in the references [ 11 , 12 ].…”

Section: Resultsmentioning

confidence: 99%

“…Due to its high specific strength and excellent corrosion resistance, Ti–5Al–2.5Sn alloy has been employed in engineering applications such as aerospace and warship structures. Specifically, Ti–5Al–2.5Sn alloy is suitable for use in jet and steam turbine blades, as well as turbopumps, where high-rate loadings such as blasts, foreign object impact, and high-speed machining often occur [ 1 , 2 , 3 ]. Therefore, it is of great significance to understand and model the mechanical behavior of Ti–5Al–2.5Sn alloy at high strain rates for its structural applications, numerical simulations, and manufacturing processes [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Zhang

Wang

et al. 2019

Materials

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This study is an experimental investigation on the tensile responses of Ti–5Al–2.5Sn alloy over a wide range of strain rates. Uniaxial tension tests within the rate range of 10−3–101 s−1 are performed using a hydraulic driven MTS810 machine and a moderate strain-rate testing system. The high-rate uniaxial tension and tension recovery tests are conducted using a split-Hopkinson tension bar to obtain the adiabatic and isothermal stress–strain responses of the alloy under dynamic loading conditions. The experimental results show that the value of the initial yield stress increases with the increasing strain rate, while the strain rate sensitivity is greater at high strain rates. The isothermal strain-hardening behavior changes little with the strain rate, and the adiabatic temperature rise is the main reason for the reduction of the strain-hardening rate during high strain-rate tension. The electron backscatter diffraction (EBSD) analysis of the post-deformed samples indicates that there are deformation twins under quasi-static and high-rate tensile loadings. Scanning electron microscope (SEM) micrographs of the fracture surfaces of the post-deformed samples show dimple-like features. The Zerilli–Armstrong model is modified to incorporate the thermal-softening effect of the adiabatic temperature rise at high strain rates and describe the tension responses of Ti–5Al–2.5Sn alloy over strain rates from quasi-static to 1050 s−1.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Zhang

Wang

et al. 2019

Materials

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“…The first aspect examined by this test/analysis program is the effect on the Young's Modulus of metals at cryogenic temperatures, in particular the Titanium alloy used for the RS-25 LPFP inducer. We examined a number of publically available sources, shown in Figure 2, including the well-known MMPDS [1], a recent hybrid test/analysis study by Ghisi and Mariani [2], and a dynamic modulus test by Zhang, et. al.…”

Section: Literature Surveymentioning

confidence: 99%

Natural Frequency Testing and Model Correlation of Rocket Engine Structures in Liquid Hydrogen: Phase I, Cantilever Beam

Brown

DeLessio

Jacobs

2018

Model Validation and Uncertainty Quantification, Volume 3

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Many structures in the launch vehicle industry operate in liquid hydrogen (LH2), from the hydrogen fuel tanks through the ducts and valves and into the pump sides of the turbopumps. Calculating the structural dynamic response of these structures is critical for successful qualification of this hardware, but accurate knowledge of the natural frequencies is based entirely on numerical or analytical predictions of frequency reduction due to the addedfluid-mass effect because testing in LH2 has always been considered too difficult and dangerous. This fluid effect is predicted to be approximately 4-5% using analytical formulations for simple cantilever beams. As part of a comprehensive test/analysis program to more accurately assess pump inducers operating in LH2, a series of frequency tests in LH2 were performed at NASA/Marshall Space Flight Center's unique cryogenic test facility. These frequency tests are coupled with modal tests in air and water to provide critical information not only on the mass effect of LH2, but also the cryogenic temperature effect on Young's Modulus for which the data is not extensive. The authors are unaware of any other reported natural frequency testing in this media. In addition to the inducer, a simple cantilever beam was also tested in the tank to provide a more easily modeled geometry as well as one that has an analytical solution for the mass effect. This data will prove critical for accurate structural dynamic analysis of these structures, which operate in a highly-dynamic environment.

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“…For α titanium alloys, an ultra-high tensile strength (1200–1400 MPa) is obtained at 4–77 K [ 6 ] and there always are serrations in the stress-strain curves [ 5 , 9 ]. The critical shear stress to activate the dislocation glide systems of α-titanium alloys is thermally activated and the stress decreases greatly with the temperature increasing, while the stress to activate deformation twinning is not thermally activated [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…At present, the major titanium alloys used at cryogenic temperature include pure titanium, the α type, and α + β type titanium alloys. In addition, there are extensive research studies to investigate the cryogenic mechanical properties of titanium alloys and reveal their deformation mechanisms [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Strength-Ductility Synergy in a Metastable β Titanium Alloy by Stress Induced Interfacial Twin Boundary ω Phase at Cryogenic Temperatures

Liao

Zhang

et al. 2020

Materials

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A β titanium alloy is an excellent candidate for cryogenic applications. In this study, the deformation behavior of Ti-36Nb-2Ta-3Zr-0.35O with cold swaging was investigated at cryogenic temperatures to verify its practical application value. The microstructure after tensile tests was observed by transmission electron microscope in order to reveal the cryogenic deformation mechanism. The results show that the mechanical properties of this alloy have a strong temperature dependence: an increase in strength with a non-monotonic trend (first increase and then decrease) in elongation is found when the temperature decreases from 297 K to 77 K. At 200 K, a strength-ductility synergy is obtained and is mainly due to the occurrence of {211} <11> mechanical twinning accompanied with the ω plate located at the twin boundaries, which is the first time it is detected in titanium alloy at a cryogenic temperature. However, at 77 K, martensitic transformation (β phase to α phase) is induced by the tensile deformation, leading to the increase of strength with a massive sacrifice of elongation. These findings provide insights for understanding the deformation mechanisms and optimizing the mechanical properties of titanium alloys at a cryogenic temperature.

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Mechanical characterization of Ti–5Al–2.5Sn ELI alloy at cryogenic and room temperatures

Cited by 22 publications

References 42 publications

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Strain-Rate-Dependent Tensile Response of Ti–5Al–2.5Sn Alloy

Natural Frequency Testing and Model Correlation of Rocket Engine Structures in Liquid Hydrogen: Phase I, Cantilever Beam

Strength-Ductility Synergy in a Metastable β Titanium Alloy by Stress Induced Interfacial Twin Boundary ω Phase at Cryogenic Temperatures

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