Microstructural features of failure surfaces and low-temperature mechanical properties of Ti-6Al-4V ELI ultra-fine grained alloy

Tabachnikova, E. D.; Podolskiy, A. V.; Bengus, V. Z.; Smirnov, S. N.; Csach, К.; Miškuf, Jozef; Saitova, L. R.; Semenova, Irina P.; Valiev, Ruslan Z.

doi:10.1007/s11223-008-0019-7

Cited by 2 publications

(2 citation statements)

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“…However, despite the importance of thermal softening, when the effect of strain rate is studied, heat losses and temperature in the deforming specimen are not studied in detail, and isothermal or adiabatic conditions are assumed without a clearly defined criterion. Regarding temperature, most studies focus on relatively high or low temperatures , while the effect of small deviations from room temperature is not considered. However, the study of this temperature range is especially interesting.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects During Tensile Deformation of Ti‐6Al‐4V at Different Strain Rates

Galán

Verleysen

Degrieck

2013

Strain

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An in‐depth analysis of the effect of heat generated by plastic work on the observed tensile behaviour of Ti6Al4V at different strain rates is presented. Special emphasis is put on the transition from isothermal to adiabatic conditions and how this transition is affected by several process parameters such as material properties, environmental conditions and sample geometry. Experiments are performed in isothermal conditions at moderate temperatures, from −10 to 70 °C, as well as at strain rates from quasi‐static speeds to more than 1000 s−1 using a split Hopkinson tensile bar setup. This experimental data is used in conjunction with numerical simulations to determine the evolution of temperature during the experiments and the temperature and strain rate sensitivity of the material, as well as the Taylor–Quinney coefficient. Finally, a full model of the material behaviour is presented and used to define clear limits for adiabatic and isothermal conditions.

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Section: Introductionmentioning

confidence: 99%

Thermal Effects During Tensile Deformation of Ti‐6Al‐4V at Different Strain Rates

Galán

Verleysen

Degrieck

2013

Strain

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“…The morphology of these dimples is similar to the dimples observed on the fracture surface of nanostructured Ti alloy. [12] (2) When the temperature decreases from 300 to 170 K, the regions of type A appear beside to type B regions. As was already noted, flat surfaces are typical of regions of the type A with separate grains and their conglomerates (clusters), extracted from the initial fracture surface, and also cavities on failure surfaces.…”

Section: Fractographic Features Of Failure Surfacesmentioning

confidence: 99%

Strain-Rate Sensitivity and Failure Peculiarities in Compression of the Nanocrystalline Ni-20 Pct Fe Alloy at Low Temperatures

Tabachnikova

Podolskiy

Bengus

et al. 2010

Metall Mater Trans A

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The strain-rate sensitivity of the applied stress was measured, and the values of the activation volume of the process of the plastic deformation V along the deformation curve in compression of the nanocrystalline (NC) Ni-20 pct Fe alloy (with average grain size~22 nm) in the temperature range of 300 to 77 K (27 to À196°C) were calculated. It was found that the decrease of the temperature from 300 to 77 K leads to a decrease of the value of V from 20 to 8 b 3 , and values of V do not depend on the strain. Fractographic features of the failure surfaces were studied in the temperature range 300 to 4.2 K (27 to À269°C). Observed traces of melting on these surfaces at temperatures below 300 K indicate the intense heating in the catastrophic shear band of the alloy in the moment of failure. Causes of low-temperature decohesion along grain boundaries are discussed in terms of the sulfur segregation influence.

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Microstructural features of failure surfaces and low-temperature mechanical properties of Ti-6Al-4V ELI ultra-fine grained alloy

Abstract: UD C 539. 4 M ic r o s t u r a l F e a t u r e s o f F a il u r e S u r f a c e s a n d L o w -T e m p e r a t u r e M e c h a n ic a l P r o p e r t i e s o f T i -

Cited by 2 publications

References 5 publications

Thermal Effects During Tensile Deformation of Ti‐6Al‐4V at Different Strain Rates

Thermal Effects During Tensile Deformation of Ti‐6Al‐4V at Different Strain Rates

Strain-Rate Sensitivity and Failure Peculiarities in Compression of the Nanocrystalline Ni-20 Pct Fe Alloy at Low Temperatures

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