Characterization of the variant selection occurring during the α→β→α phase transformations of a cold rolled titanium sheet

Gey, Nathalie; Humbert, Michel

doi:10.1016/s1359-6454(01)00351-2

Cited by 240 publications

(109 citation statements)

References 15 publications

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“…In comparison with the theoretical representation (10%, 20% + 30% → 50%, 20%, 20%) our results are dierent. It follows that the variant selection is not random, which is in accordance with the literature [11]. It is reported that these uneven volumefractions of the variants are caused by mutual orientations of original β-grains [11,12].…”

Section: Discussionsupporting

confidence: 85%

“…In results from the literature, these peaks are predicted, but they are not distinguishable experimentally [7,11]. On the other hand, peaks for angles of 60…”

Section: Discussionmentioning

confidence: 95%

“…The t includes either ve peaks as described by the theory or four peaks that is more plausible from the data. Similarly, the means of the peaks are either xed or they are freely chosen as tting parameters [7,11]. The t for 5 peaks is not very successful and the distinction between peaks at 60…”

Section: Discussionmentioning

confidence: 99%

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Alpha Variant Selection Determined from Grain Misorientations in Ti-6Al-7Nb Alloy with a Duplex Microstructure

et al. 2015

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Titanium occurs in two structures; a high temperature body-centered cubic structure which is known as β phase and an ambient temperature α phase which has the hexagonal closed-packed structure. In the present study a biomedical Ti6Al7Nb alloy was investigated. The so-called duplex structure consisting of α lamellae and equiaxed primary α-grains was prepared by a thermal treatment. The α lamellae are created during cooling from a β-eld according to the Burgers relation. This relation allows the formation of the α lamellae with dierent crystallographic orientations so-called variants. The preferential misorientation between α lamellae was studied by a detailed electron backscattered diraction analysis. The misorientation of grains in the duplex structure was modelled by a sum of random Mackenzie distribution and Gaussian peaks related to the preferred misorientations according to the Burgers relation. The preferred misorientations based on the Burgers relationship were identied in the biomedical Ti6Al7Nb alloy with duplex structure. It is conrmed that the variant selection of α lamellae is not random.

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Section: Discussionsupporting

confidence: 85%

“…In results from the literature, these peaks are predicted, but they are not distinguishable experimentally [7,11]. On the other hand, peaks for angles of 60…”

Section: Discussionmentioning

confidence: 95%

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Alpha Variant Selection Determined from Grain Misorientations in Ti-6Al-7Nb Alloy with a Duplex Microstructure

et al. 2015

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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 simulated random distributions in the cubic and hexagonal systems are shown in Figure 10. [34,35] Assuming that the areas of LAB, MAB, and HAB occupied the same area proportions in the cubic and hexagonal systems, the LAB, MAB, and HAB could be roughly assigned to be 0 to 13 deg, 13 to 35 deg, and over 35 deg, respectively, in the completely random hexagonal system. The misorientation angle distributions in the ␣ 2 and ␤ phases in the as-received alloy, and the post-SP 0 deg specimen at the fracture tip loaded at 750 °C and 920 °C are shown in Figure 11.…”

Section: Grain Misorientation Distributions Under Various Conditionsmentioning

confidence: 99%

Texture evolution and mechanical anisotropy in dual-phase Ti3Al-based alloy loaded at 700 °C to 1000 °C

Yang

Huang

Wang

2004

Metall Mater Trans A

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The super ␣ 2 Ti 3 Al-based alloy with a fine grain size of ϳ2.2 m exhibits superplastic elongations over 1000 pct at 920 °C to 1000 °C, 600 pct at 900 °C, 330 pct at 850 °C, and 140 pct at 750 °C. Mechanical anisotropy is observed in this alloy, and relatively lower flow stresses and higher tensile elongations are obtained in the 45 deg specimen loaded at 25 °C to 960 °C. The texture characteristics appear to impose significant influence on the mechanical anisotropy at temperatures below 900°C (under the dislocation creep condition), and the and {0001} basal textures evolve in the ␤ and ␣ 2 phases after tensile straining. At loading temperatures higher than 900 °C (under the superplastic flow condition), the anisotropy effect is less pronounced and the grain orientation distribution becomes basically random in nature. Rationalizations for the mechanical anisotropy in terms of the Schmid factor calculations for the major and minor texture components in the ␤ and ␣ 2 phases provide consistent explanations for the deformation behavior at lower temperatures as well as the initial straining stage at higher temperatures. {111}Ͻ21 1Ͼ

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Characterization of the variant selection occurring during the α→β→α phase transformations of a cold rolled titanium sheet

Cited by 240 publications

References 15 publications

Alpha Variant Selection Determined from Grain Misorientations in Ti-6Al-7Nb Alloy with a Duplex Microstructure

Alpha Variant Selection Determined from Grain Misorientations in Ti-6Al-7Nb Alloy with a Duplex Microstructure

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

Texture evolution and mechanical anisotropy in dual-phase Ti3Al-based alloy loaded at 700 °C to 1000 °C

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