Influence of complex LCF and dwell load regimes on fatigue of Ti–6Al–4V

Tympel, Peter O; Lindley, T.C.; Saunders, Edward A.; Dixon, Mark; Dye, David

doi:10.1016/j.actamat.2015.09.014

Cited by 81 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3f. In addition, some 〈c + a〉 dislocation networks, frequently left over after annealing and which can act as sources 42 , were observed in the hard grain, Fig. 3g.…”

Section: Resultsmentioning

confidence: 99%

Predicting dwell fatigue life in titanium alloys using modelling and experiment

Joseph

Karamched

et al. 2020

Nat Commun

Self Cite

View full text Add to dashboard Cite

Fatigue is a difficult multi-scale modelling problem nucleating from localised plasticity at the scale of dislocations and microstructure with significant engineering safety implications. Cold dwell fatigue is a phenomenon in titanium where stress holds at moderate temperatures lead to substantial reductions in cyclic life, and has been implicated in service failures. Using discrete dislocation plasticity modelling complemented by transmission electron microscopy, we successfully predict lifetimes for ‘worst case’ microstructures representative of jet engine spin tests. Fatigue loading above a threshold stress is found to produce slip in soft grains, leading to strong dislocation pile-ups at boundaries with hard grains. Pile-up stresses generated are high enough to nucleate hard grain basal dislocations, as observed experimentally. Reduction of applied cyclic load alongside a temperature excursion during the cycle lead to much lower densities of prism dislocations in soft grains and, sometimes, the elimination of basal dislocations in hard grains altogether.

show abstract

“…3f. In addition, some 〈c + a〉 dislocation networks, frequently left over after annealing and which can act as sources 42 , were observed in the hard grain, Fig. 3g.…”

Section: Resultsmentioning

confidence: 99%

Predicting dwell fatigue life in titanium alloys using modelling and experiment

Joseph

Karamched

et al. 2020

Nat Commun

Self Cite

View full text Add to dashboard Cite

show abstract

“…A representative SEM micrograph is shown in Figure 2(c); the 80 material is further characterised in [28].…”

Section: Materials Preparationmentioning

confidence: 99%

The formation of ordered clusters in Ti–7Al and Ti–6Al–4V

et al. 2016

Self Cite

View full text Add to dashboard Cite

Ti-Al alloys can suffer from a chemical decomposition on ageing around 500 C or on air cooling. At long ageing times this results in the formation of a 2 (Ti 3 Al) precipitates. At reduced times or elevated temperatures, diffuse electron or neutron diffraction peaks can be observed, which has been termed 'short range ordering' (SRO). Here, we present correlative transmission electron microscopy (TEM) and atom probe tomography (APT) results showing that the reaction proceeds through the formation of ordered Al-rich precipitate clusters. Notably, Al-Al clustering could be observed well before the appearance of distinct precipitates in the TEM. In addition, the Vcontaining a phase of Ti-6Al-4V formed ordered clusters much faster than in binary Ti-7Al. This implies that the ternary addition of b stabilisers exacerbates the problem of a 2 precipitate formation in commercial dual phase titanium alloys.

show abstract

“…Small scale compression tests on the Ti–Fe–Mo alloy were performed on 3 mm diameter cylinders with 5 mm height as shown in Fig. 3 , alongside data from a Ti-64 sample further studied in [5] . The modulus, 0.2% proof strength and compressive strain to failure of the Ti–Fe–Mo alloy in the solution heat treated and aged conditions as well as the Ti-64 sample are listed in Table 1 .…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Data on a new beta titanium alloy system reinforced with superlattice intermetallic precipitates

et al. 2018

View full text Add to dashboard Cite

The data presented in this article are related to the research article entitled “a new beta titanium alloy system reinforced with superlattice intermetallic precipitates” (Knowles et al., 2018) [1]. This includes data from the as-cast alloy obtained using scanning electron microscopy (SEM) and x-ray diffraction (XRD) as well as SEM data in the solution heat treated condition. Transmission electron microscopy (TEM) selected area diffraction patterns (SADPs) are included from the alloy in the solution heat treated condition, as well as the aged condition that contained < 100 nm B2 TiFe precipitates [1], the latter of which was found to exhibit double diffraction owing to the precipitate and matrix channels being of a similar width to the foil thickness (Williams and Carter, 2009) [2]. Further details are provided on the macroscopic compression testing of small scale cylinders. Of the micropillar deformation experiment performed in [1], SEM micrographs of focused ion beam (FIB) prepared 2 µm micropillars are presented alongside those obtained at the end of the in-situ SEM deformation as well as videos of the in-situ deformation. Further, a table is included that lists the Schmidt factors of all the possible slip systems given the crystal orientations and loading axis of the deformed micropillars in the solution heat treated and aged conditions.

show abstract

Influence of complex LCF and dwell load regimes on fatigue of Ti–6Al–4V

Cited by 81 publications

References 40 publications

Predicting dwell fatigue life in titanium alloys using modelling and experiment

Predicting dwell fatigue life in titanium alloys using modelling and experiment

The formation of ordered clusters in Ti–7Al and Ti–6Al–4V

Data on a new beta titanium alloy system reinforced with superlattice intermetallic precipitates

Contact Info

Product

Resources

About