Charpy absorbed energy of ultrafine-grained Ti-6Al-4V alloy at cryogenic and elevated temperatures

Semenova, Irina P.; Modina, Iuliia M.; Polyakov, A.; Klevtsov, G. V.; Klevtsova, N. A.; Pigaleva, I. N.; Valiev, Ruslan Z.

doi:10.1016/j.msea.2018.10.076

Cited by 23 publications

(10 citation statements)

References 21 publications

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“…[ 10,23–25 ] For Ti6Al4V the SEM images indicate no effect of the ECAP treatment on the grain size of the α phase. For the β phase, however, no separate detectable grains are present after the ECAP treatment, a drastic reduction compared to Ti6Al4V AR (grain size 1.46 ± 0.02 µm) that is in agreement with the findings of Semenova et al [ 26 ] It is also possible that the observed effect is at least partially due to a decrease in the amount of β phase as described by Valiev et al [ 8 ]…”

Section: Figuresupporting

confidence: 90%

Strengthening of Titanium by Equal Channel Angular Pressing ‐ Impact on Oxide Layer Properties of Pure Titanium and Ti6Al4V

Franz

Mingler

Krystian

et al. 2020

Adv Materials Inter

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Equal channel angular pressing (ECAP) as a method applicable to large samples for strengthening metallic materials via severe plastic deformation has recently attracted considerable interest. For biomedical applications, ECAP‐treated pure titanium is a promising alternative for implants subjected to high mechanical loads as it contains no potentially cytotoxic alloying elements. The consequences of an ECAP treatment for the physico‐chemical properties of the air formed passive layers of pure or alloyed titanium, which are of the utmost importance for the biological response to these materials, are studied here for the first time. This includes mechanical, electron microscopic, and electrochemical investigations in protein containing media to study the reactions that occur immediately after implantation in the phase boundary between implant and biological system. The ECAP treatment results in a positive shift of the flatband potential and a particularly strong increase of the donor density for the native oxide layers. This is associated with increased electronic conductivity of the oxide layers under anodic polarization.

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Section: Figuresupporting

confidence: 90%

Strengthening of Titanium by Equal Channel Angular Pressing ‐ Impact on Oxide Layer Properties of Pure Titanium and Ti6Al4V

Franz

Mingler

Krystian

et al. 2020

Adv Materials Inter

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“…the propagation of cracks is easier. The macroscopic features of the fracture zone are the same as the results reported by Semenova et al [18]. When the temperature is higher (20 °C), it can be clearly seen that the proportion of the ber area of the fracture is large.…”

Section: Macroscopic Morphology Of the Fracturesupporting

confidence: 85%

“…As to this phenomenon, Runchen et al [22] investigated the fracture toughness of Ti60 alloy, and found the toughness of samples decreased when temperature reduced. Semenova et al [18] also found the same phenomenon when they studied the Charpy absorbed energy of UFG Ti-6Al-4V alloy at different temperatures. Therefore, the ductile-brittle transition of Ti-6Al-4V titanium alloy under low temperature, as shown in Fig.…”

Section: Effect Of Low Temperature On Impact Energymentioning

confidence: 53%

“…When the energy of the accumulation is large enough, micro-cracks are formed on the dissociation crystal plane and extends along the cleavage plane and through the grain interior or grain boundary, causing the sample to break, thereby a decrease in the toughness of the material. When the temperature is higher, the dislocation plug-up group of adjacent dislocation sources can gain energy and move, resulting in the release of the accumulated energy without causing dissociation fracture [18] [22]. At the same time, the number of active dislocations is large, which leads to the number of voids gathered around the inclusions is large.…”

Section: Microscopic Morphology Of the Fracturementioning

confidence: 99%

“…The results suggested that temperature and strain had a signi cant in uence on material properties. In addition, Semenova et al [18] conducted tensile tests and Charpy tests to study the in uence of temperature on ultra ne-grained Ti-6Al-4V titanium alloy, and investigated that the ultimate tensile strength and yield stress enhanced in a wide range of temperature, and the absorbed energy decreased when the temperature reduced. properties of Ti-6Al-4V titanium alloy, and expected to provide an positive guidance for investigation on the cryogenic cutting of titanium alloy and its cutting mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Effect of Low Temperature on Impact Properties of Ti-6Al-4V Titanium Alloy

Zhao¹,

Su²,

L³

et al. 2020

Preprint

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Cryogenic cutting is becoming an attractive machining method for difficult-to-cut materials. However, it’s very difficult to analyze directly their cutting mechanism at low temperature. In order to better understand the various physical phenomena in the cryogenic cutting of titanium alloy, the Charpy impact test of Ti-6Al-4V titanium alloy at low temperatures (as low as -196 °C) was undertaken in this work. The Charpy absorbed energy of Ti-6Al-4V titanium alloy at low temperatures was investigated firstly. Then, by observing the microscopic and macroscopic morphology of the fracture, the impact properties and fracture modes of Ti-6Al-4V titanium alloy at low temperatures were analyzed. It was found that the impact toughness of Ti-6Al-4V titanium alloy reduces when the temperature decreases from 20 °C to -196 °C, and the fracture appears a tendency to become brittle. Meanwhile, three kinds of areas, i.e. shear lip area, fiber area, and radiation area, were found on the fracture morphology at each temperature. Those areas correspond to the shear fracture zone, crack initiation zone, and crack extension zone, respectively. With the decrease in temperature, the proportion of fiber area decreases, and the radiation area appears and increases gradually. However, fiber areas were still observed on the macroscopic morphology of the fracture under − 196 °C, which suggests that Ti-6Al-4V titanium alloy still has the ability to deform plastically at such low temperatures. The research result in this work provide a fundamental support for analyzing the cutting mechanism of Ti-6Al-4V titanium alloy at low temperatures.

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Ultrafine‐Grained Titanium‐Based Alloys: Structure and Service Properties for Engineering Applications

et al. 2019

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Herein, an overview of the recent research on the relationship between the ultrafine‐grained (UFG) structure of titanium and its alloys and the physical and mechanical properties of the materials, as well as the formation of advanced functional and service properties, including fatigue strength, creep behavior, and impact and fracture toughness is presented. It is shown that due to the record properties achieved in UFG titanium and its alloys, these materials have an innovative potential for successful application in medicine and engineering industries. Some of these works are carried out in cooperation with the team of Prof. Terence G. Langdon. Professor Langdon made a significant contribution to the development of modern materials science in the field of nanostructured metallic materials.

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Charpy absorbed energy of ultrafine-grained Ti-6Al-4V alloy at cryogenic and elevated temperatures

Cited by 23 publications

References 21 publications

Strengthening of Titanium by Equal Channel Angular Pressing ‐ Impact on Oxide Layer Properties of Pure Titanium and Ti6Al4V

Strengthening of Titanium by Equal Channel Angular Pressing ‐ Impact on Oxide Layer Properties of Pure Titanium and Ti6Al4V

Investigation on the Effect of Low Temperature on Impact Properties of Ti-6Al-4V Titanium Alloy

Ultrafine‐Grained Titanium‐Based Alloys: Structure and Service Properties for Engineering Applications

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