Using finite element modeling to examine the temperature distribution in quasi-constrained high-pressure torsion

Figueiredo, Roberto B.; Pereira, Pedro Henrique R.; Aguilar, Maria Teresa Paulino; Cetlin, Paulo Roberto; Langdon, Terence G.

doi:10.1016/j.actamat.2012.02.027

Cited by 282 publications

(161 citation statements)

References 17 publications

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“…For Fe processed at 1 turn per minute, it has been shown [44,45] that T is 25C. Using that data we can determine C 4 .…”

Section: Sample Heatingmentioning

confidence: 93%

“…Finite element (FE) model predicting the temperature rise in Al, Cu and Fe during HPT processing is presented in [44,45]. We will show below that the effect of temperature increase during HPT on the hardness after HPT is relatively small, and we will here use an approximation to provide an analytical model.…”

Section: Sample Heatingmentioning

confidence: 99%

“…In the model we will further consider that the sample temperature during HPT deformation can increase due to the work by deformation being converted into heat [44,45]. The temperature increase, T, is directly influenced by the ratio of mechanical deformation energy imposed on the sample divided by the heat capacity, and can be approximated as:…”

Section: Sample Heatingmentioning

confidence: 99%

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Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

2013

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“…For Fe processed at 1 turn per minute, it has been shown [44,45] that T is 25C. Using that data we can determine C 4 .…”

Section: Sample Heatingmentioning

confidence: 93%

Section: Sample Heatingmentioning

confidence: 99%

Section: Sample Heatingmentioning

confidence: 99%

See 1 more Smart Citation

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

2013

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“…In this processing condition, each anvil contains a shallow depression having a depth of less than one-half of the disc thickness so that some limited material is extruded around the periphery of the disc during processing [11,12]. The samples were processed under a pressure of 6.0 GPa with a rotation rate of 1 rpm at room temperature.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296 -373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ≈ 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ~360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°  45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ~5 µm.

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“…All of the HPT processing was performed under quasiconstrained conditions, where there is a very limited outflow of material around the edge of the disk during processing. [41] Following processing by HPT, each disk was polished to a mirror-like surface and measurements of the Vickers microhardness, Hv, were taken along four diameter lines arranged on each disk surface at 45 increments. The individual datum points were separated by 0.25 mm to a distance of 1.5 mm on either side of the center of each disk and then they were separated by 0.5 mm thereafter.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

Effect of Initial Annealing Temperature on Microstructural Development and Microhardness in High‐Purity Copper Processed by High‐Pressure Torsion

et al. 2017

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The effect of the initial annealing temperature on the evolution of microstructure and microhardness in high purity OFHC Cu is investigated after processing by HPT. Disks of Cu are annealed for 1 h at two different annealing temperatures, 400 and 800 C, and then processed by HPT at room temperature under a pressure of 6.0 GPa for 1/4, 1/2, 1, 5, and 10 turns. Samples are stored for 6 months after HPT processing to examine the self-annealing effects. Electron backscattered diffraction (EBSD) measurements are recorded for each disk at three positions: center, mid-radius, and near edge. Microhardness measurements are also recorded along the diameters of each disk. Both alloys show rapid hardening and then strain softening in the very early stages of straining due to self-annealing with a clear delay in the onset of softening in the alloy initially annealed at 800 C. This delay is due to the relatively larger initial grain size compared to the alloy initially annealed at 400 C. The final microstructures consist of homogeneous fine grains having average sizes of 0.28 and 0.34 mm for the alloys initially annealed at 400 and 800 C, respectively. A new model is proposed to describe the behavior of the hardness evolution by HPT in high purity OFHC Cu.

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Using finite element modeling to examine the temperature distribution in quasi-constrained high-pressure torsion

Cited by 282 publications

References 17 publications

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

Hardening of pure metals by high-pressure torsion: A physically based model employing volume-averaged defect evolutions

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Effect of Initial Annealing Temperature on Microstructural Development and Microhardness in High‐Purity Copper Processed by High‐Pressure Torsion

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