Concurrent operation of ⟨c + a⟩ slip and twinning under cyclic loading of Ti-6Al-4V

Lavogiez, C.; Hémery, S.; Villechaise, Patrick

doi:10.1016/j.scriptamat.2018.07.033

Cited by 36 publications

(13 citation statements)

References 22 publications

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“…The twin has a lenticular shape with a root localized at the grain boundary. This let suppose that twinning was stimulated by a slip band in G3 impinging the grain boundary as previously reported in the literature [12,13]. At the interface between G2 and G1 such twin activation is not detected.…”

Section: Slip Band / Grain Boundary Interactionssupporting

confidence: 60%

Deformation processes near a crack initiation site under dwell-fatigue loading of Ti-6Al-4V

2020

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The present article reports an investigation of the mechanism of surface crack initiation of a dwell fatigue tested Ti-6Al-4V alloy with a bi-modal microstructure. Interactions between slip bands and grain boundaries were characterized in order to obtain insights into the crack initiation process and discuss the similarities with models described in the literature. Twinning and local lattice rotation occurred as a result of the slip band blocking at the interface and suggests high local stress concentrations. Nevertheless, crack initiation happened to be intergranular and not transgranular. The crack opened up the basal plane that was located at the interface between two nodules poorly oriented for slip and having a common c axis of the hexagonal unit cell.

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Section: Slip Band / Grain Boundary Interactionssupporting

confidence: 60%

Deformation processes near a crack initiation site under dwell-fatigue loading of Ti-6Al-4V

2020

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“…While twinning is inhibited by the high aluminum content occasional occurrences were found under cyclic loading at relatively low plastic strain (i.e., 2.5 pct). [116] In this case, {10 12}h10 11i tension twins were observed and operate concurrently with hc + ai pyramidal slip. While pyramidal slip traces extend across the whole grain, the twins are generally much smaller and accommodate intergranular deformation incompatibilities due to heterogeneous slip activity.…”

Section: B Slip Initiationmentioning

confidence: 84%

“…associated to twinning in a neighboring grain which cannot deform by basal or prismatic slip. [112,116] Besides slip blocking at interfaces, the most frequent interaction is slip transfer across interfaces. For equiaxed or bi-modal microstructures, the consideration of slip transfer across a/a boundaries is essential to account for the deformation behavior.…”

Section: A-a Grain Boundariesmentioning

confidence: 99%

“…[54] Its occurrence was also reported under tension and cyclic loading. [116,117] Dynamic loading exacerbates the twinning activity. [150] The reported data suggests that the early twinning activity proceeds after a few percent strain.…”

Section: Competition With Twinningmentioning

confidence: 99%

“…[150] The reported data suggests that the early twinning activity proceeds after a few percent strain. [54,112,116,117,151] While under compression loading twins are located in grains with their c-axis nearly normal to the loading axis, Lavogiez et al [116] found twins in grains with their c-axis within 20 deg from the loading axis. In grains with such orientations, activation of basal or prismatic slip is difficult and hc + ai pyramidal slip was found to operate.…”

Section: Competition With Twinningmentioning

confidence: 99%

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Microplasticity at Room Temperature in α/β Titanium Alloys

Hémery

Villechaise

Banerjee

2020

Metall Mater Trans A

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The current understanding of room temperature microplasticity in a/b titanium alloys is reviewed with a special emphasis on dual-phase engineering alloys. As the interplay between microstructure and deformation mechanisms governs both the microscale and macroscale mechanical response, a brief description of the main features of a/b microstructures is first provided. Elastic and plastic deformation in individual phases is then described. The complex interactions that govern the effect of grain boundaries, phase interfaces and microtexture on deformation behaviour are reviewed. Crystal plasticity simulations have evolved over the past decade as a key technique to obtain a mechanistic understanding of the deformation of Ti alloys. Micromechanical aspects are emphasized with a discussion of input parameters required to achieve realistic constitutive modeling. As microplasticity is especially relevant in cyclic loading such as experienced in-service by components, the current understanding of the relation of this regime with fatigue and dwell-fatigue behavior is briefly summarized in the final section.

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Microstructure-Based Estimation of Strength and Ductility Distributions for $$\alpha +\beta $$ Titanium Alloys

Echlin

Kasemer

Chatterjee

et al. 2021

Metall Mater Trans A

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Concurrent operation of ⟨c + a⟩ slip and twinning under cyclic loading of Ti-6Al-4V

Cited by 36 publications

References 22 publications

Deformation processes near a crack initiation site under dwell-fatigue loading of Ti-6Al-4V

Deformation processes near a crack initiation site under dwell-fatigue loading of Ti-6Al-4V

Microplasticity at Room Temperature in α/β Titanium Alloys

Microstructure-Based Estimation of Strength and Ductility Distributions for $$\alpha +\beta $$ Titanium Alloys

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Concurrent operation of ⟨c + a⟩ slip and twinning under cyclic loading of Ti-6Al-4V

Cited by 36 publications

References 22 publications

Deformation processes near a crack initiation site under dwell-fatigue loading of Ti-6Al-4V

Deformation processes near a crack initiation site under dwell-fatigue loading of Ti-6Al-4V

Microplasticity at Room Temperature in α/β Titanium Alloys

Microstructure-Based Estimation of Strength and Ductility Distributions for $$\alpha +\beta $$ Titanium Alloys

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Product

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Concurrent operation of ⟨c + a⟩ slip and twinning under cyclic loading of Ti-6Al-4V