Effect of temperature rise on microstructural evolution during high-pressure torsion

Edalati, Kaveh; Hashiguchi, Yuki; Pereira, Pedro Henrique R.; Horita, Zenji; Langdon, Terence G.

doi:10.1016/j.msea.2017.12.095

Cited by 89 publications

(46 citation statements)

References 39 publications

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“…Several studies have reported the occurrence of recrystallization and an increase in the fraction of Σ3 boundaries in Cu due to adiabatic heating during the HPT process . However, the temperature rise calculated from Equation is not sufficient to introduce dynamic softening during HPT processing which is in agreement with earlier studies reporting the same findings …”

Section: Discussionsupporting

confidence: 88%

The Stability of Oxygen‐Free Copper Processed by High‐Pressure Torsion after Room Temperature Storage for 12 Months

et al. 2019

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Ultrafine‐grained copper samples produced by high‐pressure torsion are stored at room temperature for 12 months to investigate microstructural stability and the self‐annealing phenomena. The results show that samples processed by low numbers of turns exhibit less thermal stability after storage for 12 months in comparison with samples processed by high numbers of turns. A significant decrease in the hardness is recorded near the edges of the discs processed by 1/4, 1/2, and 1 turn due to recrystallization and grain growth, whereas a minor drop in hardness values is observed in the samples processed by 3, 5, and 10 turns. This drop in hardness is related to a recovery mechanism.

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Section: Discussionsupporting

confidence: 88%

The Stability of Oxygen‐Free Copper Processed by High‐Pressure Torsion after Room Temperature Storage for 12 Months

et al. 2019

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“…It should be noted that a temperature increase during HPT processing is critical in terms of atomic diffusion. However, in practice a very recent report demonstrated very limited temperature increases in the very early stages of HPT processing and a saturation at <1 turn under 2.0 GPa for several metals including Al, Ag, Cu, Fe, Sn, and Ti . Moreover, an earlier study on processing of Al and Mg disks by HPT also showed only a limited temperature increase up to 10 HPT turns at 6.0 GPa .…”

Section: Discussionmentioning

confidence: 90%

Direct Bonding of Aluminum–Copper Metals through High‐Pressure Torsion Processing

Han

Liang

et al. 2018

Adv Eng Mater

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High-pressure torsion (HPT) is used to investigate the formation of a new metal system by the direct bonding of separate disks of Al and Cu by processing at room temperature under a compressive pressure of 6.0 GPa and with increasing numbers of HPT turns up to 60. A detailed examination of the microstructure and a phase analysis reveal the presence of three intermetallic compounds, Al 2 Cu, AlCu, and Al 4 Cu 9 , in the nanostructured Al matrix with a grain size of %30 nm. Processing by HPT leads to the formation of a metal-matrix nanocomposite with extreme hardness near the edge of the Al-Cu disks after 60 HPT turns. Experiments show that the estimated wear rates exhibit an improvement in wear resistance while maintaining low wear rates for high applied loads up to %40-50 N under dry sliding conditions. The results confirm that there is a significant potential for using HPT processing in the joining and bonding of dissimilar metals at room temperature and in the expeditious fabrication of a wide range of new metal systems having enhanced mechanical and functional properties.

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“…Recent research has shown that the refinement of tungsten grain size can improve its mechanical properties, such as the enhancement of its ductility [9][10][11][12]. Many methods have been proposed to refine the grain size, such as equal channel angular extrusion (ECAE) [13,14], high-pressure torsion (HPT) [15,16], accumulative roll bonding (ARB) [17,18], surface mechanical attrition treatment (SMAT) [19,20], and high-energy ball milling [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ball Milling Parameters on the Refinement of Tungsten Powder

Liang

et al. 2018

Metals

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The high-energy ball milling method was adopted to explore the influence of ball milling parameters, such as milling speed and additive amounts of process control agent (PCA) on tungsten powder. The morphology and microstructure of tungsten powder in the process of refinement were characterized by field-emission scanning electron microscope (FE-SEM), field-emission transmission electron microscope (FE-TEM), and X-ray diffractometer (XRD). Results revealed that the ball milling process and the refinement of tungsten particle and grain can be largely influenced by these two parameters. The milling efficiency was found to be highest with the milling speed of 700 rpm and additive amounts of 8% PCA. The mechanisms for the effect of these two parameters and milling time on the refinement process were discussed. Nanocrystalline tungsten powder with a particle size and grain size smaller than 100 nm was obtained, and the grain size of 5-15 nm was fabricated successfully under the highest milling efficiency conditions.

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Effect of temperature rise on microstructural evolution during high-pressure torsion

Cited by 89 publications

References 39 publications

The Stability of Oxygen‐Free Copper Processed by High‐Pressure Torsion after Room Temperature Storage for 12 Months

The Stability of Oxygen‐Free Copper Processed by High‐Pressure Torsion after Room Temperature Storage for 12 Months

Direct Bonding of Aluminum–Copper Metals through High‐Pressure Torsion Processing

Effect of Ball Milling Parameters on the Refinement of Tungsten Powder

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