Mechanical behavior and microstructure properties of titanium powder consolidated by high-pressure torsion

Zhilyaev, Alexander P.; Ringot, Geoffrey; Huang, Yi; Cabrera, José‐María; Langdon, Terence G.

doi:10.1016/j.msea.2017.02.032

Cited by 49 publications

(25 citation statements)

References 36 publications

(33 reference statements)

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“…Application of HPT method to powders usually results in enhanced consolidation even at room temperature. While the powder consolidation for many metals, alloys, and metal‐based composites is almost ideal and close to the bulk condition, the consolidation of oxide powders is only partial. This behavior of oxides, which is similar to that for intermetallic compounds, is due to their high hardness, brittle behavior, and poor plasticity‐induced consolidation.…”

Section: Recent Findings On Hpt Processing Of Oxidesmentioning

confidence: 99%

Review on Recent Advancements in Severe Plastic Deformation of Oxides by High‐Pressure Torsion (HPT)

Edalati

2018

Adv Eng Mater

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Severe plastic deformation (SPD) of oxides has been of interest in mineralogy and geology for many decades, but oxides have ionic or covalent bonds with brittle nature and can hardly be deformed at ambient temperature. SPD processing of oxides is first realized in 1930s, when Percy W. Bridgman introduce the principles of high-pressure torsion (HPT) method. Although the method is widely used nowadays to produce ultrafine-grained (UFG) metals, the application of method for SPD processing of oxides is quite limited. This article reviews some of the recent publications on the application of HPT method to oxide ceramics () and summarizes their major findings: powder compaction and partial consolidation, nanograin formation, formation of different kinds of lattice defects such as dislocations and oxygen vacancies, strain and grain size dependence of phase transformations, and improvement of functional properties such as bandgap narrowing, photoluminescence, photocatalytic activity, and dielectricity. Early Studies on HPT Processing of OxidesAs mentioned earlier, SPD processing of oxides has been of interest for many decades in mineralogy and geology. Boeker is

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Section: Recent Findings On Hpt Processing Of Oxidesmentioning

confidence: 99%

Review on Recent Advancements in Severe Plastic Deformation of Oxides by High‐Pressure Torsion (HPT)

Edalati

2018

Adv Eng Mater

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“…Equal-channel angular pressing (ECAP) [5] and high-pressure torsion (HPT) [4] are particularly effective for achieving ultrafine-grain structures [6][7][8]. However, for CP-Ti and Ti alloys, the ECAP processing is normally conducted at a high temperature [9] whereas HPT processing can be carried out at room temperature [10]. As a result, the use of HPT is generally preferred for achieving grain refinement and strength enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…4, such that failure occurs at approximately 840 MPa before the occurrence of any extensive plastic deformation. The low ductility in the HPT-processed 10 turns sample is attributed to the high dislocation density introduced by the torsional straining[10,30,31] which tends to limit the strain hardening ability of the material. By applying short-term annealing of 10 minutes on the HPT-processed 10 turns sample at 473 K, the ductility of the sample is significantly improved but with some reduction in strength.…”

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confidence: 99%

Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment

Lin

Mortier

et al. 2019

Journal of Alloys and Compounds

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Commercial purity titanium (CP-Ti) was processed by high-pressure torsion (HPT) with various numbers of turns (N = 1, 10 and 20). The hardness of the CP-Ti increased with an increasing number of HPT turns due to grain refinement. Tensile testing showed that the HPT-processed 10 turns sample had low ductility and high strength but the ductility may be improved through post-HPT short-term annealing at carefully selected temperatures. Some HPT-processed samples were laser surface-treated with different laser powers and scanning speeds. The surface roughness of the laser-textured samples increased with increasing laser power and led to a lower contact angle which signifies an increased hydrophilicity. After a holding time of 13 days, the samples underwent a hydrophilic-to-hydrophobic transformation as the contact angle increased to as much as 129 o. It is concluded that laser surface texture processes are capable of controlling the hydrophilic / hydrophobic properties of ultra-fine grained CP-Ti.

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“…Thus, HPT is a top‐down approach in which grain refinement is achieved in bulk solids through the intensive introduction of point and line defects during processing. The basic principles of HPT have been utilized also for the bonding of machining chips and the consolidation of metallic powders but these processes generally have additional requirements such as a high processing temperature and/or cold/hot compaction prior to the application of HPT.…”

Section: Introductionmentioning

confidence: 99%

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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Mechanical behavior and microstructure properties of titanium powder consolidated by high-pressure torsion

Cited by 49 publications

References 36 publications

Review on Recent Advancements in Severe Plastic Deformation of Oxides by High‐Pressure Torsion (HPT)

Review on Recent Advancements in Severe Plastic Deformation of Oxides by High‐Pressure Torsion (HPT)

Processing of CP-Ti by high-pressure torsion and the effect of surface modification using a post-HPT laser treatment

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

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