In situ observation of texture evolution during α→β and β→α phase transformations in titanium alloys investigated by neutron diffraction

Lonardelli, I.; Gey, Nathalie; Wenk, H. R.; Humbert, Michel; Vogel, Sven C.; Lutterotti, Luca

doi:10.1016/j.actamat.2007.06.017

Cited by 179 publications

(77 citation statements)

References 35 publications

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“…55 This would explain the depletion of the 11-20 maximum and the formation of a 01-10 maximum. However, the girdle 30° offset from 0001 cannot be explained by this and is likely due to slip.…”

Section: Iii-iv High Temperature Texturementioning

confidence: 99%

In situ phase transformation and deformation of iron at high pressure and temperature

Miyagi

Kunz

Knight

et al. 2008

Journal of Applied Physics

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With a membrane based mechanism to allow for pressure change of a sample in a radial diffraction diamond anvil cell (rDAC) and simultaneous infra-red laser heating, it is now possible to investigate texture changes during deformation and phase transformations over a wide range of temperature-pressure conditions. The device is used to study bcc (α), fcc (γ) and hcp (ε) iron. In bcc iron, room temperature compression generates a texture characterized by (100) and (111) poles parallel to the compression direction. During the deformation induced phase transformation to hcp iron, a subset of orientations are favored to transform to the hcp structure first and generate a texture of (01-10) at high angles to the compression direction. Upon further deformation, the remaining grains transform, resulting in a texture that obeys the Burgers relationship of (110) bcc // (0001) hcp . This is in contrast to high temperature results that indicate that texture is developed through dominant pyramidal 〈a+c〉 {2-1-12}〈2-1-13〉 and basal (0001)〈2-1-10〉 slip based on polycrystal plasticity modeling. We also observe that the high temperature fcc phase develops a 110 texture typical for fcc metals deformed in compression.

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Section: Iii-iv High Temperature Texturementioning

confidence: 99%

In situ phase transformation and deformation of iron at high pressure and temperature

Miyagi

Kunz

Knight

et al. 2008

Journal of Applied Physics

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“…It is also apparent, because the 45 • texture component is weaker than the remaining original component, that a degree of texture memory exists -less randomisation is observed than might naively be expected. It has been reported that in two-phase Ti-6Al-4V, the nucleation of new β grains from the α matrix which follow the Burgers orientation relationship (OR) is thermodynamically less favourable than growth of existing residual β-phase in the room temperature material [22,[25][26][27]. However, on cooling from the β phase field (i.e.…”

Section: β-Annealmentioning

confidence: 99%

In situ observation of texture and microstructure evolution during rolling and globularization of Ti–6Al–4V

Warwick¹,

Jones²,

Bantounas

et al. 2013

Acta Materialia

101

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The evolution of texture in β-annealed Ti-6Al-4V during α-β rolling and so-called recrystallisation annealing has been examined using synchrotron X-ray diffraction and ex-situ characterisation. During rolling, the initial α (0002) texture softens and the colony α becomes kinked. During globularisation, the texture strengthens as highly strained (and hence misoriented) areas of the laths disappear and this strengthening continues once coarsening of the primary α becomes dominant. At shorter heat treatment times the α s laths that form on cooling do so with a range of variant-related orientations to the β, but at longer annealing times this α s takes on the orientation of the surrounding α p . The implications for the mechanical performance of macrozone-containing bimodal Ti-6Al-4V material are discussed.

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“…The phenomenon has been noted in Ti-6Al-4V [23] and commercial-purity titanium [24] for cases involving complete dissolution of the low-temperature phase prior to cooling. A similar memory effect has also been found for Ti-6Al-4V, [24] Zircaloy-2, [25] and Zr-2.5Nb [26] when the peak temperature during the heat-treatment cycle results in the retention of some primary low-temperature phase; these observations, however, may be ascribed to biasing stresses developed during cooling as a result of differences in coefficients of thermal expansion of the two phases as noted.…”

Section: Introductionmentioning

confidence: 99%

Variant Selection During Cooling after Beta Annealing of Ti-6Al-4V Ingot Material

Sargent

Kinsel

Pilchak

et al. 2012

Metall Mater Trans A

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The selection of alpha variants during the cooling of Ti-6Al-4V from the beta-phase field was investigated. For this purpose, samples with a coarse, columnar beta-grain structure with a h100i fiber texture were extracted from an as-cast production-scale ingot. The alpha variants in the as-cast samples as well as those produced during several successive beta-annealing treatments were determined using electron backscatter diffraction (EBSD). The EBSD results indicated that a subset of the 12 possible variants was developed within each grain; the specific variants were a function of the cooling rate after beta heat treatment. Moreover, the generation of similar variants during successive heat treatments involving an identical cooling rate suggested a noticeable memory effect. The variant selection process was rationalized based on calculations of the strain associated with the beta-to-alpha transformation. These calculations revealed that the overall aggregate strain approached zero in both the as-cast condition as well as after beta heat treatment, suggesting the occurrence of a long-range self-accommodation mechanism.

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In situ observation of texture evolution during α→β and β→α phase transformations in titanium alloys investigated by neutron diffraction

Cited by 179 publications

References 35 publications

In situ phase transformation and deformation of iron at high pressure and temperature

In situ phase transformation and deformation of iron at high pressure and temperature

In situ observation of texture and microstructure evolution during rolling and globularization of Ti–6Al–4V

Variant Selection During Cooling after Beta Annealing of Ti-6Al-4V Ingot Material

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