Mechanical properties and microstructural evolution of nanocrystalline titanium at elevated temperatures

Shahmir, Hamed; Pereira, Pedro Henrique R.; Huang, Yi; Langdon, Terence G.

doi:10.1016/j.msea.2016.05.105

Cited by 25 publications

(12 citation statements)

References 41 publications

(38 reference statements)

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“…Fully annealed Grade 2 titanium has a microhardness value of ~170 [32] and this value correlates well with the microhardness in the edge region of the compacted disk. Therefore, it is concluded that the radial shear deformation present during pure compression of the disk assists directly in the densification of the titanium powder.…”

Section: Microhardnessmentioning

confidence: 68%

“…Using the Archimedes method for measuring density gave a range of densities between 0.90 and 0.95 of the value for the bulk Ti density where the high scatter is due to the small mass of the HPT disk (< 0.5 mg). It should be noted that HPT processing at P = 6.0 GPa for 5 whole revolution gives the same level of microhardness (~300 Hv) as for bulk Ti [32].…”

Section: Microhardnessmentioning

confidence: 86%

“…This specimen configuration was described earlier and the gauge dimensions were 1.1 x 1.0 x 0.6 mm 3 [32].…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

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

Zhilyaev

Ringot

Huang

et al. 2017

Materials Science and Engineering: A

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Abstract.Research was conducted to investigate the potential for consolidating titanium powder using high-pressure torsion (HPT) at room temperature. The nanostructured samples processed by HPT were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM).The results show there is a significant refinement of the Ti powder and it consolidates into bulk nanostructured titanium with a mean grain size estimated by TEM as ~200-300 nm and a mean crystallite size measured by XRD as ~20-30 nm. Microhardness measurements and tensile testing show high strength and low ductility after consolidation under a pressure of 6.0 GPa for 5 revolutions. Additional short annealing at a temperature of 300°C for 10 minutes leads to a significant enhancement in ductility while maintaining the high strength.

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Section: Microhardnessmentioning

confidence: 68%

Section: Microhardnessmentioning

confidence: 86%

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

Zhilyaev

Ringot

Huang

et al. 2017

Materials Science and Engineering: A

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“…using HPT process. This has led to the hardness of 300 Hv and strength of 940 MPa 17 . A comprehensive study was performed on the consolidating pure aluminum powder in tube by equal channel angular pressing and twist extrusion process 18 .…”

Section: Introductionmentioning

confidence: 99%

Tribological and mechanical investigation of multi-directional forged nickel

Djavanroodi

Ebrahimi

Nayfeh

2019

Sci Rep

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Tailoring material properties to specific application requirements is one of the major challenges in materials engineering. Grain size is a key factor affecting physical and mechanical properties of polycrystals materials, the presented work enables insight into how the pure nickel properties are affected by application of multi-directional forging (MDF) as a well-known severe plastic deformation method. It is demonstrated that the hardness and wear rate are improved by imposing MDF process. The rate of enhancement is reduced at the higher pass numbers. It is also shown that the application of MDF process changed the mechanism of wear. Non-MDF sample’s surface shows spalling and delamination, while the dominated wear mechanism of final pass sample is peeling with a slight of adhesion. The change of wear mechanism can be associated with the reduction of friction coefficient of the deformed sample. By considering the linear correlation between the hardness and wear rate, a simple and fast procedure is proposed to estimate the wear rate of sample after the different MDF pass numbers using the corresponding hardness magnitude. Additionally, the attained microstructure of the final pass sample shows a combination of ultrafine grains and micro shear bands.

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“…However, with increasing number of turns, the microstructures usually evolve toward homogeneity and many metals exhibit a complete homogeneity at high numbers of turns. Materials showing this behavior include Al, [3,[8][9][10][11][12][13] Cu, [14][15][16] Ti, [17][18][19] Mg, [20][21][22][23] Fe, [24][25][26] Ni, [27,28] and numerous others metals and alloys. [29,30] Nevertheless, some materials show a different type of behavior when processed by HPT.…”

Section: Introductionmentioning

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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Mechanical properties and microstructural evolution of nanocrystalline titanium at elevated temperatures

Cited by 25 publications

References 41 publications

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

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

Tribological and mechanical investigation of multi-directional forged nickel

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

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