Estimation of heat production during high pressure torsion of Cu-based metallic glass

Hóbor, S.; Kovács, Zsolt; Révész, Ádám

doi:10.1016/j.jallcom.2009.10.056

Cited by 15 publications

(3 citation statements)

References 22 publications

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“…In practice, the flow curve of CP-Ti in the fully-annealed condition, as shown in that, taking ε  0.6, it follows that ΔT  165 K. Therefore, for a specimen deformed at room temperature (296 K), it appears that the temperature may increase to a value of ~460 K. This is consistent with other calculations of temperature rises in HPT processing [33,34] and the rise is sufficient to prevent the α to ω-phase transformation. Nevertheless, the calculation is not adequate because it assumes adiabatic conditions with no heat loss from the sample to the massive HPT anvils.…”

Section: The Effect Of Temperature Rise In Hpt Processingsupporting

confidence: 84%

Characteristics of the allotropic phase transformation in titanium processed by high-pressure torsion using different rotation speeds

Shahmir

Langdon

2016

Materials Science and Engineering: A

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An investigation was initiated to examine the effect of rotation speed on the allotropic α to ω-phase transformation in titanium. A grade 2 commercial purity titanium was processed by high-pressure torsion (HPT) at room temperature up to a maximum of 10 turns using a pressure of 5.0 GPa and different rotation speeds from 0.5 to 2 rpm. It is shown that the allotropic phase transformation occurs during HPT at different rotation speeds but the volume fraction of the ω-phase decreases when the rotation speed is increased. The results indicate that the hardness and strength are decreased by processing the specimens at higher rotation speeds. Additional annealing for 15 min at 423 and 473 K after HPT processing is also effective in changing the volume fractions of the ω-phase and producing an ω to α reverse phase transformation. The results are interpreted in terms of the temperature rise during HPT processing.

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Section: The Effect Of Temperature Rise In Hpt Processingsupporting

confidence: 84%

Characteristics of the allotropic phase transformation in titanium processed by high-pressure torsion using different rotation speeds

Shahmir

Langdon

2016

Materials Science and Engineering: A

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“…Hóbora et al reported that Cu 60 Zr 20 Ti 20 BMGs occurred crystallization after HPT process [64]. On the contrary, some research data indicate that BMGs did not occurred crystallization after HPT process.…”

Section: Effect Of Hollowcone High-pressure Torsion On the Thermal Anmentioning

confidence: 97%

Ultrafine-Grained Materials Fabrication with High Pressure Torsion and Simulation of Plastic Deformation Inhomogeneous Characteristics

Song¹,

Wang²,

Chen³

et al. 2017

Severe Plastic Deformation Techniques

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Utilization of severe plastic deformation (SPD) methods has provided a convenient approach for producing ultrafine-grained (UFG) materials exhibiting outstanding characteristics especially mechanical properties. HPT as one of the SPD methods can lead both to smaller grains and to a higher fraction of high-angle grain boundaries, which is an especially attractive procedure by researchers. In order to understand the nonlinearities relationship between the mechanical properties and the developed strain during plastic deformation, local deformation analysis using the finite element methodwas applied for the HPT process. In this chapter, results are reported of an investigation on the deformed microstructure and mechanical properties of different materials samples during the HPT process using experiments and FEM simulations. Simulation results indicate that the disks show inhomogeneity development and distribution of strain and stress during the plastic deformation. Microstructure and hardness investigation results can give a well support to verify the rules of inhomogenous plastic deformation in the early stage of the HPT disks. Furthermore, the friction and anvil geometry play important roles in the homogeneity of the deformation. After the hollow cone high pressure torsion (HC-HPT), the thermal stability of Zr 64.13 Cu 15.75 Ni 10.12 Al 10 BMGs is enhanced, while the elastic modulus of BMG will be decreased.

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“…In a recent study, the observed morphological and microstructural features introduced by HPT of an amorphous Cu 60 Zr 30 alloy were interpreted by temperature profiles obtained from a simple model based on one-dimensional heat-conduction [24,25]. Later the effect of the instrumental parameters on the temperature rise was discussed in terms of a quasi three-dimensional model [26], and the role of the most important parameter, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effect of accumulated shear on the microstructure and morphology of severely deformed Cu60Zr30Ti10 metallic glass

Hóbor

Kovács

Révész

2011

Journal of Alloys and Compounds

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Estimation of heat production during high pressure torsion of Cu-based metallic glass

Cited by 15 publications

References 22 publications

Characteristics of the allotropic phase transformation in titanium processed by high-pressure torsion using different rotation speeds

Characteristics of the allotropic phase transformation in titanium processed by high-pressure torsion using different rotation speeds

Ultrafine-Grained Materials Fabrication with High Pressure Torsion and Simulation of Plastic Deformation Inhomogeneous Characteristics

Effect of accumulated shear on the microstructure and morphology of severely deformed Cu60Zr30Ti10 metallic glass

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