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Microstructures and Mechanical Properties of Ti-6Al-7Nb Processed by High-pressure Torsion [PDF]
Procedia Engineering, 2014 Ti-6Al-7Nb was deformed by high-pressure torsion to improve the mechanical properties of the alloy. high-pressure torsion was conducted at room temperature under pressures of 2 and 6GPa for disk-shaped specimens.
Yusuke Tsutsumi +2 more
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Evaluating the influence of pressure and torsional strain on processing by high-pressure torsion
Journal of Materials Science, 2008Tests were conducted on an Al-6061 alloy to evaluate the separate effects of the applied pressure and the torsional straining in processing by high-pressure torsion (HPT). The values of the Vickers microhardness were measured after processing and plotted both linearly across the diameters of the disks and as three-dimensional representations.
Xu, Cheng +2 more
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Finite Element Analysis of High Pressure Torsion
steel research international, 2013High pressure torsion (HPT) is an important process for producing ultrafine grained materials, and while numerous experimental investigations of HPT have been carried out, most concentrated on microstructure, texture, or the mechanical properties of the processed materials, while few work has been carried out by using FEM because of extreme mesh ...
Wei, Peitang +5 more
openaire +3 more sources
Bulk nanocrystalline ω-Zr by high-pressure torsion
Scripta Materialia, 2008 Pure nanocrystalline Zr with a grain size of 30 nm and a microhardness of 400 HV has been fabricated by high-pressure torsion (HPT) at room temperature using a pressure of 6 GPa and five revolutions in 5 min.
A P Zhilyaev +2 more
exaly +2 more sources
Strengthening of Nickel Deformed by High Pressure Torsion
Materials Science Forum, 2008The strength of a deformed metal depends on the content of high angle boundaries, low angle dislocation boundaries and the dislocations between the boundaries. High angle boundaries contribute by Hall-Petch strengthening, whereas for the low angle dislocation boundaries and dislocations between boundaries the strengthening is proportional to the square
Zhang, H.W. +4 more
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Electromechanical high-pressure torsion apparatus
Review of Scientific Instruments, 1977An apparatus for carrying out torsional shear tests of polymers under hydrostatic pressure environment at variable rotational speeds has been developed and tested. The apparatus is capable of containing pressures up to 7 kilobars and producing rotational speeds to 1000 rpm.
K. D. Pae, A. A. Silano
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The equivalent strain in high pressure torsion
Materials Science and Engineering: A, 2014Abstract The results of experiments carried out by means of high pressure torsion (HPT) are frequently described in terms of the Eichinger “equivalent” strain. When employed in conjunction with equivalent stresses derived using von Mises in conjunction with the Fields and Backofen analysis, the values of the work done/unit volume associated with the ...
John J. Jonas +2 more
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High Pressure Torsion of Rail Steels
Materials Science Forum, 2006To study the influence of shear deformation on the evolution of the microstructure and the mechanical strength in rail steels, three steels with different microstructure (two pearlitic, one bainitic) were deformed by High Pressure Torsion (HPT). In order to evaluate in addition the effect of the strain path, a cyclic form of HPT was applied.
F. Wetscher +3 more
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New Die Design for High-Pressure Torsion
Materials Science Forum, 2022A special design of the die was developed, which allows to implement the process of severe plastic deformation by high pressure torsion to deform ring blanks, which will be the starting material for creating high-strength piston rings. A special feature of the die design is the provision of torsion of the deforming tool with constant rectilinear ...
Andrey Volokitin +2 more
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Microstructures of Nickel Deformed by High Pressure Torsion to High Strains
Materials Science Forum, 2003Microstructures of nickel deformed by the HPT up to strains of 12.0 have been examined by mean of transmission electron microscopy. Observations have been carried out in the longitudinal section for a proper demonstration of the structure morphology.
Huang, Xiaoxu +6 more
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