Local deformation mechanisms of two-phase Ti alloy

Jun, Tea‐Sung; Sernicola, Giorgio; Dunne, Fionn P.E.; Britton, T. Ben

doi:10.1016/j.msea.2015.09.016

Cited by 85 publications

(49 citation statements)

References 21 publications

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“…There are many potential avenues and strategies to fill this critical gap. Numerous efforts in current literature have explored small-scale testing (e.g., [17][18][19][20][21][22]). However, these methods are intensive in both effort and cost.…”

mentioning

confidence: 99%

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

Weaver

Khosravani

Castillo

et al. 2016

Integr Mater Manuf Innov

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Recent spherical nanoindentation protocols have proven robust at capturing the local elastic-plastic response of polycrystalline metal samples at length scales much smaller than the grain size. In this work, we extend these protocols to length scales that include multiple grains to recover microindentation stress-strain curves. These new protocols are first established in this paper and then demonstrated for Al-6061 by comparing the measured indentation stress-strain curves with the corresponding measurements from uniaxial tension tests. More specifically, the scaling factors between the uniaxial yield strength and the indentation yield strength was determined to be about 1.9, which is significantly lower than the value of 2.8 used commonly in literature. The reasons for this difference are discussed. Second, the benefits of these new protocols in facilitating high throughput exploration of process-property relationships are demonstrated through a simple case study.

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mentioning

confidence: 99%

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

Weaver

Khosravani

Castillo

et al. 2016

Integr Mater Manuf Innov

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“…This is because the CRSS for a basal ©aª slip system could be smaller than that for prismatic ©aª slip systems because of BOR. 48,49) The activation of pyramidal ©aª slip systems in the ¡ phase is observed 37,39) and the CRSS for the slip systems is estimated. 37) The CRSS for the pyramidal ©aª slip systems can be seen as the same level with the prismatic ©aª slip systems; 37) however, the shear stress passing through the ¡-¢ interface remains unknown in the pyramidal ©aª slip systems.…”

Section: Resultsmentioning

confidence: 99%

“…If we assume that there is no dislocation source possible to activate within the ¢ phase under low stress levels, and there is a greater work-hardening rate because of the size effect, it appears to be reasonable that we employ a model to represent the ¢ phase in which the deformation is developed by the movement of dislocations derived from, and pathing through, the ¡ phase. Actually, Jun et al 49) reported that the slip seems to start in the ¡ phase and progresses through the ¢ phase when micropillar compression tests of two-phase Ti alloy were conducted. Therefore, the simulation results obtained by the current models, where the ¢ phase starts to plastically deform after the yielding of the ¡ phase, or the ¢ phase cannot plastically deform in the early stages of deformation, represents one of the realistic phenomena in the initial stage of the deformation.…”

Section: Resultsmentioning

confidence: 99%

Crystal Plasticity Analysis of Microscopic Deformation Mechanisms and GN Dislocation Accumulation Depending on Vanadium Content in β Phase of Two-Phase Ti Alloy

et al. 2019

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Inhomogeneous deformation of a single ¡-¢ colony in a Ti6Al4V alloy under uniaxial tensile conditions was numerically simulated using a crystal plasticity finite element (CPFE) method, and we predicted density changes in geometrically necessary dislocations (GNDs) depending on the vanadium concentration in the ¢ phase (V ¢ ). The geometric model for the CPFE analysis was obtained by converting data from electron back-scatter diffraction patterns into data for the geometric model for CPFE analysis, using a data conversion procedure previously developed by the authors. The results of the image-based crystal plasticity analysis indicated that smaller V ¢ induced greater stress in the ¡ phase and smaller stress in the ¢ phase close to the ¡-¢ interfaces in the initial stages of deformation because of the elastically softer ¢ phase with lower V ¢ . This resulted in greater strain gradients and greater GND density close to the interfaces in the initial stages of deformation within the single ¡-¢ colony when the ¢ phase plastically does not deform. [

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“…1040°C) for 8 hours and cooling down with a sufficiently slow rate of 1°C/min. This microstructure has colonies containing large α-lamella separated by thin β-ligaments (this is the same heat treatment employed in previous studies [14,22]). Figure 1) were mechanically polished with up to 4000 grit SiC carbide paper and finally polished with ~50 nm OP-S (Oxide Polishing Suspensions) diluted with H2O by a ratio 1:5 of OP-S:H2O.…”

Section: Materials Preparationmentioning

confidence: 99%

“…The uncertainties associated with the Euler angle in those regions were within a range of ~2°, which is unlikely to affect identification of slip activity that gives rise to the visible slip bands. The Euler angles obtained from the Bruker EBSD were then used to calculate Schmid factors (SF) for all 30 slip systems with a methodology described in [14]. The primary slip systems of α phase were anticipated such that 〈 1 〉 on the prism plane (SF = 0.47) would be activated in the region 1 (i.e.…”

Section: Slip Trace Analysismentioning

confidence: 99%

The role of β-titanium ligaments in the deformation of dual phase titanium alloys

Jun

Maeder

Bhowmik

et al. 2019

Materials Science and Engineering: A

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Multiphase titanium alloys are critical materials in high value engineering components, for instance in aero engines. Microstructural complexity is exploited through interface engineering during mechanical processing to realise significant improvements in fatigue and fracture resistance and strength. In this work, we explore the role of select interfaces using insitu micromechanical testing with concurrent observations from high angular resolution electron backscatter diffraction (HR-EBSD). Our results are supported with post mortem transmission electron microscopy (TEM). Using micro-pillar compression, we performed indepth analysis of the role of select β-titanium (body centred cubic) ligaments which separate neighbouring α-titanium (hexagonal close packed) regions and inhibit the dislocation motion and impact strength during mechanical deformation. These results shed light on the strengthening mechanisms and those that can lead to strain localisation during fatigue and failure.

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Local deformation mechanisms of two-phase Ti alloy

Cited by 85 publications

References 21 publications

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

High throughput exploration of process-property linkages in Al-6061 using instrumented spherical microindentation and microstructurally graded samples

Crystal Plasticity Analysis of Microscopic Deformation Mechanisms and GN Dislocation Accumulation Depending on Vanadium Content in β Phase of Two-Phase Ti Alloy

The role of β-titanium ligaments in the deformation of dual phase titanium alloys

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