Deformation behaviour of commercially pure titanium at extreme strain rates

Gurao, N.P.; Kapoor, R.; Suwas, Satyam

doi:10.1016/j.actamat.2011.02.018

Cited by 166 publications

(60 citation statements)

References 37 publications

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“…The loading speed was set at 0.6 mm/min for all samples so as to maintain a constant strain rate. This is to minimize the effects of different strain rates in titanium [42][43][44] . The compression tests were carried out until the samples were fully deformed axially or when the maximum load of 50 kN was reached, whichever came first.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

Fabrication of titanium based biphasic scaffold using selective laser melting and collagen immersion

Sing¹,

Wang²,

Agarwala³

et al. 2017

ijb

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Fabrication of titanium based biphasic scaffold using selective laser melting and collagen immersion. © 2017 Swee Leong Sing, et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/ licenses/by-nc/4.0/), permitting all non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 65 RESEARCH ARTICLEFabrication of titanium based biphasic scaffold using selective laser melting and collagen immersion Abstract: Tissue engineering approaches have been adopted to address challenges in osteochondral tissue regeneration. Single phase scaffolds, which consist of only one single material throughout the whole structure, have been used extensively in these tissue engineering approaches. However, a single phase scaffold is insufficient in providing all the properties required for regeneration and repair of osteochondral defects. Biphasic scaffolds with two distinct phases of titanium/type 1 c ollagen and titanium-tantalum/type 1 collagen were developed for the first time using selective laser melting and collagen infiltration. Observation of the biphasic scaffolds demonstrated continuous interface between the two phases and mechanical characterization of the metallic scaffolds support the feasibility of the newly developed scaffolds for tissue engineering in osteochondral defects. Keywords: elective aser elting, itanium, antalum, ollagen, iphasic caffolds

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Section: Mechanical Characterizationmentioning

confidence: 99%

Fabrication of titanium based biphasic scaffold using selective laser melting and collagen immersion

Sing¹,

Wang²,

Agarwala³

et al. 2017

ijb

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“…The deformation mechanisms in hcp metal are complex because of the competition between dislocation slip (including basal, prismatic pyramidal slip model) and twinning under different deformation conditions [11,12]. Especially, due to a relatively high Al content, twinning in alloyed TA15 tends to be suppressed and dislocation slip is the dominant plastic deformation mechanism.…”

Section: Introductionmentioning

confidence: 99%

Study of plastic deformation mechanisms in TA15 titanium alloy by combination of geometrically necessary and statistically-stored dislocations

et al. 2016

International Journal of Materials Research

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Study of plastic deformation mechanisms in TA15 titanium alloy by combination of geometrically necessary and statistically-stored dislocationsThis study combines geometrically necessary dislocation analysis and statistically-stored dislocation identification to investigate plastic deformation mechanisms in TA15 titanium alloy. Tensile tests were conducted up to different strains at room temperature. The slip lines were observed and identified using high resolution scanning electron microscopy. Geometrically necessary dislocations were calculated based on strain gradient theories. The statisticallystored dislocations were studied using transmission electron microscopy under two beam conditions. The results indicate that the ratio of -type geometrically necessary dislocation density to -type decreases from 5 -8 to 1 -3 with increasing strain from 0.8 % to 2.0 %. The -type slip is the dominant deformation mechanism at the early stage of plastic deformation, whereas -slips become dominant with further increase in deformation strain.Keywords: Deformation mechanisms; Geometrically necessary dislocation; Slip line; Transmission electron microscopy; Electron backscatter diffraction 1. Introduction TA15, also known as Ti-6Al-2Zr-1Mo-1V, is a typical near a titanium alloy. The microstructure of TA15 is composed of dominant a lamellae (hexagonal-close-packed, hcp) and a few residual beta phases (body-centered-cubic, bcc) at room temperature [1]. Because of its high specific strength and excellent corrosion resistance at the evaluated temperature, TA15 titanium alloy is preferentially used in aviation and aerospace industries [2 -9].Generally, because of low symmetry of the hcp crystal structure and the special lamella grain morphology, the near a titanium alloy exhibits low tensile ductility, high strength and anisotropic mechanical properties compared to beta and a+b titanium alloy [10]. The deformation mechanisms in hcp metal are complex because of the competition between dislocation slip (including basal, prismatic pyramidal slip model) and twinning under different deformation conditions [11,12]. Especially, due to a relatively high Al content, twinning in alloyed TA15 tends to be suppressed and dislocation slip is the dominant plastic deformation mechanism. According to von-Mises criterion, at least five independent slip systems are required for homogeneous plastic deformation. Therefore, in addition to basal <11 20> {0002}, prismatic <11 20>{10 10} and pyramidal <11 20> {10 11} slip modes, the non-basal <11 23>{10 11} and/or {11 22} <11 23> slips are invoked [13]. However, the effect of addition slip modes on full plastic deformation of titanium and titanium alloys is still debatable [14]. Therefore, it is very important to study deformation mecha-

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“…Among the several types of twinning systems, <101 � 2> twinning is the easiest to nucleate or grow [10][11]. Moreover, the microstructures, including the crystal orientations, grain size, and grain boundaries, also play vital roles in determining the mechanical behavior [13]. Many studies have been conducted to determine the mechanical responses of CP-Ti under various loading conditions from both micro-and macroscopic viewpoints [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic deformation behavior under various strain paths in commercially pure titanium Grade 1 and Grade 2 sheets

Hama

Kobuki

et al. 2016

Materials Science and Engineering: A

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In this study, the anisotropic deformation behavior in commercially pure titanium Grade 1 and Grade 2 sheets under various strain paths was examined. A small but sharp stress peak arose during tension following compression in the Grade 1 sheet when loaded in the rolling direction, and the occurrence of a stress peak was retarded when the sheet was subjected to cyclic loading; however, such behavior did not occur in the Grade 2 sheet. Similarly, the work-hardening rate was different between the initial and latter stages of compression following tension. These behaviors did not arise when the sheets were loaded in other directions. The type of active twin mode was different depending on the loading path. When loaded in the rolling direction in both Grade 1 and Grade 2 sheets, <101 � 2> twinning and detwinning were active, respectively, during compression and tension following compression, whereas <112 � 2> twinning and detwinning were active during tension and compression following tension. The twinning activity was much more pronounced in the Grade 1 sheet than in the Grade 2 sheet. The abovementioned stress-strain responses were presumed to result from twinning and detwinning activities as for magnesium alloy sheets.However, we concluded that the effect of twinning activity on the stress-strain curves was much smaller in the titanium sheet than in magnesium alloy sheets.

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Deformation behaviour of commercially pure titanium at extreme strain rates

Cited by 166 publications

References 37 publications

Fabrication of titanium based biphasic scaffold using selective laser melting and collagen immersion

Fabrication of titanium based biphasic scaffold using selective laser melting and collagen immersion

Study of plastic deformation mechanisms in TA15 titanium alloy by combination of geometrically necessary and statistically-stored dislocations

Anisotropic deformation behavior under various strain paths in commercially pure titanium Grade 1 and Grade 2 sheets

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