An analysis of the low temperature, low and high strain-rate deformation of Ti−6Al−4V

Follansbee, P.S.; Gray, George T.

doi:10.1007/bf02651653

Cited by 265 publications

(132 citation statements)

References 21 publications

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“…[4][5][6][7][8] In general, the results show that, to a greater or lesser extent, most non-metallic and composite materials exhibit a significant change in mechanical properties when deformed under different strain rates and temperatures. Several mechanisms have been proposed to account for the change in mechanical properties prompted by high velocity deformation, including dislocation damping, 9) thermally-activated mechanisms, 10) and so on.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Lee

Lin

Chen³

et al. 2011

Mater. Trans.

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Dynamic impact response of Inconel 718 alloy is studied at temperatures ranging from À150 to 550 C and strain rates in the range of 1000 to 5000 s À1 using a compressive split Hopkinson pressure bar. It is found that the flow stress increases with increasing strain rate, but decreases with increasing temperature. The highest work hardening rate is observed in the specimen at the lowest temperature (À150 C) and the highest strain rate (5000 s À1 ). However, the work hardening rate is weakened by the deformation-induced temperature rise under high strain and strain rate conditions. The strain rate sensitivity increases with increasing strain rate, but decreases with increasing temperature. The activation energy varies as a function of the strain rate and temperature, and has a maximum value of 40 kJ/mol. The greatest thermal softening effect occurs at the highest strain rate of 5000 s À1 and temperatures in the range À150$25 C. The microstructural observations confirm that the mechanical response of the Inconel 718 specimens is directly related to the effects of the strain rate and temperature on the evolution of the impacted microstructure.

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Section: Introductionmentioning

confidence: 99%

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Lee

Lin

Chen³

et al. 2011

Mater. Trans.

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“…For example, polycrystalline metals and crystalline alloys with FCC [35,36], BCC [37], and HCP [38] structures normally exhibit a higher strength at dynamic strain rates than that at quasi-static strain rates. In the case of metallic glasses, localized shear band formation is the dominant deformation mode at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

et al. 2005

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Compressive deformation behavior of the Nd 60 Fe 20 Co 10 Al 10 bulk metallic glass was characterized over a wide strain rate range (6.0!10 K4 to 1.0!10 3 s K1 ) at room temperature. Fracture stress was found to increase and fracture strain decrease with increasing applied strain rate. Serrated flow and a large number of shear bands were observed at the quasi-static strain rate (6.0!10 K4 s K1 ). The results suggest that the appearance of a large number of shear bands is probably associated with flow serration observed during compression; and both shear banding and flow serration are a strain accommodation and stress relaxation process. At dynamic strain rates (1.0!10 3 s K1 ), the rate of shear band nucleation is not sufficient to accommodate the applied strain rate and thus causes an early fracture of the test sample. The fracture behavior of the Nd 60 Fe 20 Co 10 Al 10 bulk metallic glass is sensitive to strain rate. q

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“…The Ti-Al-4V material parameters for the MTS model are summarized in Table 1 (Follansbee and Gray 1989). In order to see the difference between the traditional JC model and the MTS model, the material flow stresses are plotted as a function of strain at three different temperature levels, as shown in Fig.…”

Section: Mts Modelmentioning

confidence: 99%

MTS model based force prediction for machining of Ti-6Al-4V

Pan

Shih

Garmestani

et al. 2017

JAMDSM

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The high temperature and severe plastic deformation could promote workpiece material microstructure evolution in the machining process. The material mechanical properties are functions of the material microstructure attributes. Traditional material flow stress model approximates the material mechanical behavior at a continuum level by ignoring the microstructure effects. In the current study, a microstructure based mechanical threshold stress (MTS) model is proposed for the machining process application. The MTS model takes the material grain boundary and dislocation resistance into account. Within both the analytical and FEA machining process modeling framework, the MTS model is implemented for the machining forces prediction. The validation of the MTS application into machining forces prediction are conducted by comparison with experimental results. Good agreement is found between the experiment and prediction. Additionally, slight force prediction improvement is observed by comparing with the traditional Johnson-cook flow stress model.

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An analysis of the low temperature, low and high strain-rate deformation of Ti−6Al−4V

Cited by 265 publications

References 21 publications

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Strain rate-dependent compressive deformation behavior of Nd-based bulk metallic glass

MTS model based force prediction for machining of Ti-6Al-4V

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