Deformation modes of the α-phase of ti-6al-4v as a function of oxygen concentration and aging temperature

Welsch, G.; Bunk, W.

doi:10.1007/bf02642403

Cited by 98 publications

(42 citation statements)

References 10 publications

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“…Different investigations [39,40] have demonstrated in monotonic testing of Ti alloys with an aluminum concentration pct, that, above 500°C, pyramidial slip is limited as a deformation mode as compared to basal and prism slips. Moreover, the possibility of slip occurring along any of these prism or basal directions is generally determined by the corresponding critical resolved shear stress (CRSS).…”

Section: A Slip Behaviormentioning

confidence: 98%

Fatigue crack growth mechanisms in Ti6242 lamellar microstructures: Influence of loading frequency and temperature

Sansoz

Ghonem

2003

Metall Mater Trans A

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Fatigue crack growth experiments were carried out on Ti6242 alloy with large colony size. The alloy was heat treated to provide three different lamella size; fine, coarse, and extra coarse. Tests were conducted at two temperatures, 520°C and 595°C, using two loading frequencies, 10 and 0.05 Hz. The latter frequency was examined with and without a 300-second hold time. All tests were performed in air environment and at a stress ratio of 0.1. This study shows that at 520°C, the Fatigue crack growth rate (FCGR) is not significantly influenced by changes in the microstructure. For 0.05 Hz/low , however, the FCGR is higher in the fine lamellar microstructure and is accompanied by-the appearance of a plateau, which disappears in the extra large lamella microstructure. Furthermore, the addition of a 300-second hold time does not alter the crack growth rate. At 595°C, while the general level of the FCGR is higher than that at 520°C, the effects of loading frequency and hold time remain similar to those reported at the lower temperature. Unlike the results at 520°C, however, the FCGR at low is not influenced by variations in lamellar microstructure. Under all test conditions, the fatigue process is predominantly controlled by one single mechanism associated with transcolony fracture and formation of quasi-cleavage facets. The fatigue crack growth results and the associated fracture behavior as obtained in this study are correlated to the crack-tip shear activity and transmission at the interfaces. A general hypothesis accounting for the role of loading frequency, temperature, and microstructure on the observed cracking mechanisms is presented.

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Section: A Slip Behaviormentioning

confidence: 98%

Fatigue crack growth mechanisms in Ti6242 lamellar microstructures: Influence of loading frequency and temperature

Sansoz

Ghonem

2003

Metall Mater Trans A

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“…As mentioned in the introduction, these WFs have been observed in many studies of Ti alloys: in single-phase alloys (Cass 1970, Rosenberg andNix 1970) and in the ct phase of two-phase alloys as well (Schectman and Eylon 1978, Welsch and Bunk 1982, Woodfield 1985, Pelissie et al 1995. Weak fringes were observed in both prism and pyramidal planes.…”

Section: Discussionmentioning

confidence: 92%

“…Deformation in the cc phase of commercial Ti alloys has been observed to be planar as well (Thompson and Odegard 1973, Welsch et a/. 1977, Welsch and Bunk 1982, Miller et al 1987. Recently, Neeraj et al (2000) have shown that deformation is planar in a Ti-6 wt% A1 alloy after room temperature creep deformation.…”

Section: Introductionmentioning

confidence: 94%

“…Recently, Neeraj et al (2000) have shown that deformation is planar in a Ti-6 wt% A1 alloy after room temperature creep deformation. Weak fringes are present between the dislocations in (a)-type slip bands in published transmission electron micrographs of both binary Ti-A1 alloys (Cass 1970, Rosenberg andNix 1970) as well as in the a phase of commercial Ti alloys (Schectman and Eylon 1978, Welsch and Bunk 1982, Woodfield 1985, Pelissie et al 1995. In all these studies, except for that of Woodfield, the presence of the these fringes in the slip bands is not discussed.…”

Section: Introductionmentioning

confidence: 95%

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Observation and analysis of weak-fringing faults in Ti-6 wt% Al

Neeraj

Mills

2002

Philosophical Magazine A

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Weak-fringing faults have been observed in planar slip bands in a Ti-6 wt% A1 alloy by transmission electron microscopy. The magnitude of the contrast was observed to increase with the number of dislocations shearing a particular region in the slip plane, and the fringe contrast was observed to saturate along a slip band. The fault fringes were determined to be caused by a residual displacement of the form R =

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“…The mechanical properties of the hexagonal ␣-phase differ from those of the cubic (bcc) ␤-phase; e.g., the Young modulus of the ␤-phase (72 ± 25 GPa) is smaller than that of the ␣-phase (100 -145 GPa, depending on the crystallographic orientation). 31 For the LVM and CLM measurements, the effect of such inhomogeneity was minimized by making the indentations exclusively in the ␣-phase of the alloy. Of course, the ␤-phase lying underneath the surface might be "hit" as well, especially in case of indentations performed using larger maximum loads in the LVM.…”

Section: Surface Roughnessmentioning

confidence: 99%

Hardness–depth profile of a carbon-implanted Ti–6Al–4V alloy and its relation to composition and microstructure

et al. 2001

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The variation of mechanical properties (hardness, indentation modulus) within a carbon-implanted region of a Ti-6Al-4V alloy-about 350-nm thick-was, for the first time, related with the microstructure and the chemical composition with a depth accuracy as small as ±20 nm. Microstructure, chemical composition, and mechanical properties of the implanted alloy were determined using transmission electron microscopy, Auger electron spectroscopy, and nanoindentation, respectively. The microstructure within the implanted region contains TiC precipitates, the density of which changes with depth in accordance with the carbon content. The hardness depends on the precipitate density: the maximum hardness occurs at the depth where an almost continuous TiC layer had formed. The depth profiles of hardness and indentation modulus were measured using three different methods: the cross-section method (CSM); the constant-load method (CLM); and the load-variation method (LVM). Only the hardness-depth profile obtained using the CSM, in which the indentations are performed perpendicular to the hardness gradient on a cross section of the specimen, reflects the microstructural variations present in the implanted region.

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Deformation modes of the α-phase of ti-6al-4v as a function of oxygen concentration and aging temperature

Cited by 98 publications

References 10 publications

Fatigue crack growth mechanisms in Ti6242 lamellar microstructures: Influence of loading frequency and temperature

Fatigue crack growth mechanisms in Ti6242 lamellar microstructures: Influence of loading frequency and temperature

Observation and analysis of weak-fringing faults in Ti-6 wt% Al

Hardness–depth profile of a carbon-implanted Ti–6Al–4V alloy and its relation to composition and microstructure

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