Phase stability and ordering behaviour of the O phase in TiAlNb alloys

Muraleedharan, K.; Nandy, T.K.; Banerjee, D.; Lele, S.

doi:10.1016/0966-9795(95)98930-7

Cited by 133 publications

(73 citation statements)

References 17 publications

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“…Mozer et al [8] studied the site occupations of O phase based on the Ti 2 AlNb stoichiometry by neutron diffraction (ND). Muraleedharan et al [9] studied the site occupations of alloying elements in the orthorhombic phase with composition as Tie27.5AlezNb (where z ¼ 25, 20 or 17.5) by atom location channelling enhanced microanalysis (ALCHEMI) and simulated the orderedisorder transformation of the O phase with aluminum content fixed at 25 at.% by using a GorskyeBraggeWilliams (GeBeW) model. Several years later, new experimental data were reported from the same laboratory in India [11].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the ordering behaviours of the orthorhombic phase based on Ti2AlNb alloys by combining thermodynamic model with ab initio calculation

Zinkevich

Aldinger

et al. 2008

Intermetallics

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Section: Introductionmentioning

confidence: 99%

Prediction of the ordering behaviours of the orthorhombic phase based on Ti2AlNb alloys by combining thermodynamic model with ab initio calculation

Zinkevich

Aldinger

et al. 2008

Intermetallics

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“…One of the transition phase's sublattices was occupied by Ti atom, the other was occupied by Al and Nb atoms together. Finally, the β phase rearranged to a O phase with orthogonal ordered structure [12].…”

Section: Microstructure and Phase Evolutionmentioning

confidence: 99%

Fabrication of TiAlNb alloy sheet by sintering pure metal foils

et al. 2011

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Ti-Al-Nb ternary intermetallic alloy sheet was fabricated by sintering pure metal foils of Ti, Al and Nb(foil-foil method). The phase evolution during sintering process and the final microstructure were analyzed by various techniques, including Back-scattered Electron Image (BEI), X-ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDS), etc. Results reveal that the structure evolution in the sintering processes is very complex and strongly depends on the sintering conditions, especially depends on whether or not the occurrence of the self-propagating high-temperature synthesis (SHS) during sintering. When sintered at relatively lower temperature, the alloy sheets are composed of multi phases of Nb 2 Al (σ), Nb 3 Al (δ), Ti 3 Al (α 2 ) and TiAl (γ) in a lamellar form. Sintered at higher temperature and annealing for sufficient long time, the sheet is composed of uniform structures mainly containing Ti 2 AlNb (O phase) and solid solution (β).

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“…[2,3,4] Therefore, these Ti 2 AlNb alloys have been receiving much attention as candidate materials for advanced aerospace applications. [5,6] Of the various alloy systems so far proposed, a Ti-22Al-27Nb (mol pct) alloy, consisting primarily of the (O ϩ B2 (Pm3m)) two-phase microstructure, shows the best balance of tensile, creep, and fracture properties.…”

Section: Introductionmentioning

confidence: 99%

Room-temperature tensile and high-cycle-fatigue strength of fine TiB particulate-reinforced Ti-22Al-27Nb composites

Emura

Hagiwara

Yang

2004

Metall Mater Trans A

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To further improve the mechanical properties of a Ti-22Al-27Nb (mol pct) alloy, based on the ordered orthorhombic Ti 2 AlNb (O phase), a TiB particulate-reinforced Ti-22Al-27Nb matrix composite was prepared using the gas-atomized powder metallurgy method. Because of the rapid solidification during the gas atomization process, the TiB particulates dispersed in the composite were extremely fine, with an average diameter of less than 1 m and lengths ranging up to 5 m. This composite (PM composite) showed higher tensile and high-cycle-fatigue properties at room temperature than both an unreinforced Ti-22Al-27Nb matrix alloy and a Ti-22Al-27Nb/TiB composite produced using a conventional ingot metallurgy method (IM composite) with relatively coarse (average diameter 5 m and average length 40 m) TiB particulates. These coarse TiB particulates in the IM composite were thought to provide only classical composite strengthening effects. On the other hand, the fine TiB particulates in the PM composite showed additional effects, such as blocking the movement of dislocations.

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Phase stability and ordering behaviour of the O phase in TiAlNb alloys

Cited by 133 publications

References 17 publications

Prediction of the ordering behaviours of the orthorhombic phase based on Ti2AlNb alloys by combining thermodynamic model with ab initio calculation

Prediction of the ordering behaviours of the orthorhombic phase based on Ti2AlNb alloys by combining thermodynamic model with ab initio calculation

Fabrication of TiAlNb alloy sheet by sintering pure metal foils

Room-temperature tensile and high-cycle-fatigue strength of fine TiB particulate-reinforced Ti-22Al-27Nb composites

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