Crystallography of grain boundary α precipitates in a β titanium alloy

Furuhara, Tadashi; Takagi, Shinichi; Watanabe, Hirohiko; Maki, Tadashi

doi:10.1007/bf02649821

Cited by 163 publications

(52 citation statements)

References 19 publications

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“…1 is the optical micrograph of cz precipitates nucleated at a planar 13 grain boundary, c~ precipitates on this boundary seem to have similar morphologies. Grain boundary c~ precipitates nearly hold the Burgers orientation relationship, i.e., { 110}13//(0001)c~, <111>13//<1120]c~, with respect to one of the adjacent [3 grains [5]. In this relationship, 12 equivalent variants are present.…”

Section: Microstructure Of a Phase Nucle-ated On Defects In ~ Matrixmentioning

confidence: 92%

“…In this relationship, 12 equivalent variants are present. It was found that a grain boundary c~ precipitate selects the variant low energy interface of which is inclined to the grain boundary plane with the smallest angle [5]. This variant restriction leads to the same precipitate morphology at a given grain boundary plane.…”

Section: Microstructure Of a Phase Nucle-ated On Defects In ~ Matrixmentioning

confidence: 95%

“…This author has studied the characteristic of ~ precipitation nucleated on various types of defects in the 13 matrix [4][5][6][7][8]. In the present paper, the crystallography of c~ precipitation in the heterogeneous nucleation on the defects in the [~ matrix of Ti-15V-3Cr-3Sn-3A1 is reviewed.…”

Section: Introductionmentioning

confidence: 97%

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Role of defects on microstructure development of beta titanium alloys

Furuhara

2000

Metals and Materials

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Microsmactures of ot precipitation from a deformed 13 matrix by thermomechanical processing were studied in a representative 13 titanium alloy, i.e. Ti-15V-3Cr-3Sn-3A1 alloy. In the aged specimens, after solution treatment, the grain boundary is the most preferential nucleation site in the o~ precipitation. Localized slip occurs in the 13 matrix by cold rolling after solution treatment whereas {332}<113> deformation twins are formed by subzero rolling at 77 K. After subsequent aging of the rolled specimens, the r phase preferentially forms on those defects in the 13 matrix with a low energy orientation relationship (Burgers relationship). There is strong variant restriction in heterogeneous nucleation on such defects. Controlled short time annealing above the [3 transus (13 recovery treatment) after cold rolling produces the fine 13 subgrain. By subsequent aging, c~ precipitates form preferentially on 13 subgrain boundaries and also within [3 subgrains. A great number of o~ variants are observed locally in the recovered and aged specimens than those in the cold rolled and aged specimens. 13 recovery treatment prior to aging improves the strength-ductility balance mostly because of the increase of local elongation.

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Section: Microstructure Of a Phase Nucle-ated On Defects In ~ Matrixmentioning

confidence: 92%

Section: Microstructure Of a Phase Nucle-ated On Defects In ~ Matrixmentioning

confidence: 95%

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Role of defects on microstructure development of beta titanium alloys

Furuhara

2000

Metals and Materials

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“…The reason of the pre-deformation-induced deviation is still not apparent, but geometrically necessary dislocations introduced by the pre-deformation are supposed to affect the balance of related boundary energies and then the equilibrium shape of in- tergranular precipitates. 22) Furuhara et al 24) showed that the orientation of intergranular a-precipitates (hcp) in a slightly pre-deformed b-matrix (bcc) in Ti-15V-3Cr-3Sn-3Al alloy was different from that in an undeformed matrix. They considered that the stress field of dislocations in the slip bands intersecting with a grain boundary preferred the specific variants of a-precipitates.…”

Section: Comparison Of Deviation Angles From the Ksmentioning

confidence: 99%

Coherent-to-Incoherent Transition of Intergranular bcc-precipitates by Pre-/Post-deformations in a Ni-43Cr Alloy

Adachi

Tsuzaki

2005

ISIJ Int.

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Effects of light deformations before and after precipitation (pre-deformation and post-deformation) on orientation distribution of intergranular bcc-precipitates were examined in a Ni-43mass%Cr alloy by electron backscattered diffraction. It was found that the deviation angles from both the plane/direction parallel orientation relationships in the Kurdjumov-Sachs orientation relationship of intergranular precipitates were increased by both pre-and post-deformations, but post-deformation was more effective. Based on this result, microstructural evolution of intergranular precipitates formed dynamically was discussed with particular attention to coherent-to-incoherent transition of precipitates.

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“…The deviation angle from the K±S relation at (b(2)/g 0 ) interface is about 208. Ameyama et al, reported that the variant selection of precipitates at the grain boundaries depends strongly on the orientation relationship between neighboring grains, grain boundary planes and so on [11,12]. The selected variant of g 0 precipitates along b grain boundaries depends strongly on grain boundary plane: one of twelve {110} b planes in the neighboring b grains, which is most parallel to the grain boundary plane, is chosen as the close packed plane for the K±S relation (criterion 1).…”

Section: Introductionmentioning

confidence: 99%

Concurrent design for NiAl-based (β/γ′) two-phase alloys by controlling microstructure and texture

Sakata

Yasuda

Umakoshi³

2002

Science and Technology of Advanced Materials

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Control of the crystallography of Ni 3 Al(g 0 ) precipitates along grain boundaries of NiAl(b) was systematically studied using b bicrystals with controlled orientations. g 0 phase preferentially precipitated along b grain boundaries showing a ®lm-like shape. The variants of g 0 precipitates were uniquely selected, which satis®es the Kurdjumov±Sachs (K±S) relation with a neighboring b grain and deviates from the relation with another adjacent b grain. In the course of tensile deformation, fracture occurred preferentially at the (b/g 0 -®lm) interface deviating from the K±S relation and the fracture stress decreased with increasing deviation angle from the K±S relation. For improvement of the coherency at the irrational (b/g 0 -®lm) boundaries, the control of microstructure and crystal orientation distribution in (b/g 0 ) two-phase polycrystals was next attempted by thermomechanical processing. After hot-compression in b phase region and subsequently annealing in (b/g 0 ) two-phase region, g 0 phase transformed from b phase with k111l b ®ber texture satisfying the K±S relation, resulting in the formation of k110l g 0 ®ber texture. In particular, a large number of (b/g 0 -®lm) boundaries became partially coherent. This thermomechanical processing was effective in controlling the crystallography of g 0 -®lm along b grain boundaries and leads to the harmonic design of strength and ductility for (b/g 0 ) two-phase alloys. q

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Crystallography of grain boundary α precipitates in a β titanium alloy

Cited by 163 publications

References 19 publications

Role of defects on microstructure development of beta titanium alloys

Role of defects on microstructure development of beta titanium alloys

Coherent-to-Incoherent Transition of Intergranular bcc-precipitates by Pre-/Post-deformations in a Ni-43Cr Alloy

Concurrent design for NiAl-based (β/γ′) two-phase alloys by controlling microstructure and texture

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