Interphase boundary structures associated with diffusional phase transformations in Ti-base alloys

Lee, H. J.; Menon, E. S. K.; Aaronson, H.I.

doi:10.1007/bf02672578

Cited by 38 publications

(20 citation statements)

References 65 publications

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“…Accordingly, the following relationship is met when the -phase (HCP) is formed during the decomposition of the high-temperature -phase (BCC): f0001g jjf110g ; h11 " 20i jjh111i . The presence of the OR during phase transformations involving HCP and BCC phases in general [1,2] and between the -and -phases of titanium in particular [3,4] has been confirmed experimentally many times. This mutual orientation of the crystal lattices of the and phases provides the basis for the formation of semi-coherent interphase boundaries.…”

Section: Introductionmentioning

confidence: 79%

“…At the edge of the terraces, at which the degree of atomic matching across the interface begins to deteriorate, the overall interface steps up to the next parallel plane where the fit is better. This model was subsequently developed in a number of other efforts [3,5,[9][10][11]13]. Extensive investigations, including high-resolution TEM analysis [11,13], have shown that the structural-ledge model describes / interfaces in two-phase titanium alloys more reliably than the planar-dislocation model.…”

Section: Energy Of A/b Boundaries In Undeformed Two-phase Titanium Almentioning

confidence: 97%

“…The crystallography of the alpha and beta phases in titanium alloys is well established [3,5,11,13,14]. Based on the data in [5], the relationship between the planes and directions in the alpha and beta phases is as follows ( Figure 1):…”

Section: Energy Of A/b Boundaries In Undeformed Two-phase Titanium Almentioning

confidence: 99%

“…It is assumed that only x-ledges are present in the interface while misfit along the y-direction is compensated by misfit dislocations [3]. The overall energy of the interface E AE is then…”

Section: Energy Of A/b Boundaries In Undeformed Two-phase Titanium Almentioning

confidence: 99%

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Loss of coherency of the alpha/beta interface boundary in titanium alloys during deformation

Zherebtsov

Салищев

Semiatin

2010

Philosophical Magazine Letters

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The loss of coherency of interphase boundaries in two-phase titanium alloys during deformation was analyzed. The energy of the undeformed interphase boundary was first determined by means of the van der Merwe model for stepped interfaces. The subsequent loss of coherency was ascribed to the increase of interphase energy due to absorption of lattice dislocations and was quantified by a relation similar to the Read-Shockley equation for low-angle boundaries in single-phase alloys. It was found that interphase boundaries lose their coherency by a strain of approximately 0.5 at T ¼ 800 C.

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Section: Introductionmentioning

confidence: 79%

Section: Energy Of A/b Boundaries In Undeformed Two-phase Titanium Almentioning

confidence: 97%

Section: Energy Of A/b Boundaries In Undeformed Two-phase Titanium Almentioning

confidence: 99%

Section: Energy Of A/b Boundaries In Undeformed Two-phase Titanium Almentioning

confidence: 99%

See 2 more Smart Citations

Loss of coherency of the alpha/beta interface boundary in titanium alloys during deformation

Zherebtsov

Салищев

Semiatin

2010

Philosophical Magazine Letters

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“…The WGB are lamellar and parallel. This could be explained on the one hand by the burgers orientation relationships ({0001} //{110} and [1120] //[111] ), on the other hand by the cristalographic orientation of GB , which leads to the variant selectivity [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of β‐Forging on Texture Development In Ti 6246 Alloy

Corre

Forestier²,

Brisset

et al. 2016

Proceedings of the 13th World Conference on Titanium

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Mechanical properties of / Ti alloys are improved through complex thermomechanical treatments. In particular, the -forging modifies the -phase precipitation. In this work we investigated the influence of the forging strain on microstructure development and its consequences on mechanical properties. Textures have been measured by neutron and X-ray diffractions. SEM/EBSD investigations and image processing have been used to understand the effect of forging on the -phase precipitation.

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Indentation Response and Structure‐Property Correlation in a Bimodal Ti–6Al–4V Alloy

2017

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Understanding the deformation behavior of multi-phase alloys under external loading requires careful mechanical characterization of the individual constituent phases at various length scales. The present study first evaluates the elastic moduli and hardness of the microstructural constituents viz. primary a (a p ) and transformed b (secondary a (a s ) plus retained prior b) phases in a bimodal Ti-6Al-4V alloy by nanoindentation using different loads. The bulk mechanical properties of the overall microstructure are then determined by grid wise nano-indentation, as well as micro-indentation. The alloy shows a pronounced indentation size effect; the hardness increases with the decrease in indentation load, or depth of penetration. Assuming an iso-stress condition for individual constituents (a p and transformed b) in the rule of mixture approach, the bulk mechanical properties of the Ti-6Al-4V alloy are reasonably predicted. Such prediction of bulk properties, however, is not possible when a similar calculation is performed using iso-strain condition. The transformed b phase shows disparity between the estimated and experimental values, while considering the a s and b phases individually, on both iso-stress and iso-strain assumptions. From these results, the influence of individual microstructural phases (size, distribution, volume fraction, morphology) and the interfaces between them, is found key in controlling the overall bulk mechanical response of the alloy system. KeywordsNano and micro-indentation, bimodal Ti-6Al-4V, indentation size effect, rule of mixture, iso-stress and iso-strain, grain boundary and interface

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Interphase boundary structures associated with diffusional phase transformations in Ti-base alloys

Cited by 38 publications

References 65 publications

Loss of coherency of the alpha/beta interface boundary in titanium alloys during deformation

Loss of coherency of the alpha/beta interface boundary in titanium alloys during deformation

Influence of β‐Forging on Texture Development In Ti 6246 Alloy

Indentation Response and Structure‐Property Correlation in a Bimodal Ti–6Al–4V Alloy

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