Microstructural characteristics of Ti–45Al–8.5Nb/TiB2 composites by powder metallurgy

Wang, Y.H.; Lin, Junpin; He, Yuehui; Chen, G.L.

doi:10.1016/j.jallcom.2008.01.057

Cited by 27 publications

(5 citation statements)

References 15 publications

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“…The former (DP structure) is composed of 7 equiaxed grains and lamellar colonies, while the latter (FL structure) is composed of alternate Ti 3 Al (a 2 ) an( i TiAl (7) plates [20]. The DP structure area was measured for all the specimens.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Effect of the temperature, strain rate and microstructure on flow and fracture characteristics of Ti-45Al-2Nb-2Mn+0.8vol.% TiB2 XD alloy

Erice

Pérez-Martín

Cendón

et al. 2012

Eur. Phys. J. Spec. Top.

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Abstract.A series of quasi-static and dynamic tensile tests at varying temperatures were carried out to determine the mechanical behaviour of Ti-45Al-2Nb-2Mn+0.8vol.% TiB 2 XD as-HIPed alloy. The temperature for the tests ranged from room temperature to 850°C. The effect of the temperature on the ultimate tensile strength, as expected, was almost negligible within the selected temperature range. Nevertheless, the plastic flow suffered some softening because of the temperature. This alloy presents a relatively low ductility; thus, a low tensile strain to failure. The dynamic tests were performed in a Split Hopkinson Tension Bar, showing an increase of the ultimate tensile strength due to the strain rate hardening effect. Johnson-Cook constitutive relation was used to model the plastic flow. A post-testing microstructural of the specimens revealed an inhomogeneous structure, consisting of lamellar «2 + 7 structure and 7 phase equiaxed grains in the centre, and a fully lamellar structure on the rest. The assessment of the duplex-fully lamellar area ratio showed a clear relationship between the microstructure and the fracture behaviour.

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Section: Numerical Simulationsmentioning

confidence: 99%

Effect of the temperature, strain rate and microstructure on flow and fracture characteristics of Ti-45Al-2Nb-2Mn+0.8vol.% TiB2 XD alloy

Erice

Pérez-Martín

Cendón

et al. 2012

Eur. Phys. J. Spec. Top.

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show abstract

“…In centrifugal cast automotive valves and powder metallurgy processed intermetallics, the average colony size was finer than 50 lm. [30,31] Seo et al [32] obtained an average colony size lower than 100 lm for investment casting. For spark-plasma sintering Ti-47Al-2Cr-2Nb, the average colony size was approximately 150 lm, [33] whereas the average colony size for an investment cast Ti-45Al-2Nb-2Mn+0.8 vol pct TiB 2 intermetallic ranged between 20 and 100 lm.…”

Section: A Microstructurementioning

confidence: 99%

In Situ Observations of the Deformation Behavior and Fracture Mechanisms of Ti-45Al-2Nb-2Mn + 0.8 vol pct TiB2

Muñoz‐Moreno

Boehlert

Pérez‐Prado

et al. 2011

Metall Mater Trans A

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The deformation and fracture mechanisms of a nearly lamellar Ti-45Al-2Nb-2Mn (at. pct) + 0.8 vol pct TiB 2 intermetallic, processed into an actual low-pressure turbine blade, were examined by means of in situ tensile and tensile-creep experiments performed inside a scanning electron microscope (SEM). Low elongation-to-failure and brittle fracture were observed at room temperature, while the larger elongations-to-failure at high temperature facilitated the observation of the onset and propagation of damage. It was found that the dominant damage mechanisms at high temperature depended on the applied stress level. Interlamellar cracking was observed only above 390 MPa, which suggests that there is a threshold below which this mechanism is inhibited. Failure during creep tests at 250 MPa was controlled by intercolony cracking. The in situ observations demonstrated that the colony boundaries are damage nucleation and propagation sites during tensile creep, and they seem to be the weakest link in the microstructure for the tertiary creep stage. Therefore, it is proposed that interlamellar areas are critical zones for fracture at higher stresses, whereas lower stress, high-temperature creep conditions lead to intercolony cracking and fracture.

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“…Unlike other materials with similar properties, such as TiC, ZrB 2 , and ZrC, the research on TiB 2 is non‐satisfying, especially in terms of morphology control, which has a significant impact on physical and chemical properties as reported . Thus, recently many efforts focused on the synthesis of anisotropic TiB 2 powders, such as rod‐like, whisker, hexagonal plate‐like, and hierarchical tower‐like TiB 2 etc. Among them, hexagonal plate‐like TiB 2 can be used as reinforcement in brittle ceramics to improve the toughness, or used as seed crystal for the fabrication of textured ceramics.…”

Section: Introductionmentioning

confidence: 99%

Growth behavior of TiB₂ hexagonal plates prepared via a molten‐salt‐mediated carbothermal reduction

et al. 2019

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TiB2 powders were successfully synthesized by a molten‐salt‐mediated carbothermal reduction method. The products obtained at 1300°C for 2 hours were hexagonal plates with side length of 3‐8 μm and thicknesses of 200‐500 nm. The microstructural evolution with temperature confirmed that the growth of TiB2 hexagonal plates was a layer‐by‐layer growth controlled by a two‐dimensional nucleation. No‐uniform grains were observed attached on side and step edges of TiB2 plates, which became finer and disappeared during the growth. This indicated that layer growth and growth on the side of TiB2 plates followed the surface adsorption growth model.

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Microstructural characteristics of Ti–45Al–8.5Nb/TiB2 composites by powder metallurgy

Cited by 27 publications

References 15 publications

Effect of the temperature, strain rate and microstructure on flow and fracture characteristics of Ti-45Al-2Nb-2Mn+0.8vol.% TiB2 XD alloy

Effect of the temperature, strain rate and microstructure on flow and fracture characteristics of Ti-45Al-2Nb-2Mn+0.8vol.% TiB2 XD alloy

In Situ Observations of the Deformation Behavior and Fracture Mechanisms of Ti-45Al-2Nb-2Mn + 0.8 vol pct TiB2

Growth behavior of TiB₂ hexagonal plates prepared via a molten‐salt‐mediated carbothermal reduction

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Microstructural characteristics of Ti–45Al–8.5Nb/TiB2 composites by powder metallurgy

Cited by 27 publications

References 15 publications

Effect of the temperature, strain rate and microstructure on flow and fracture characteristics of Ti-45Al-2Nb-2Mn+0.8vol.% TiB2 XD alloy

Effect of the temperature, strain rate and microstructure on flow and fracture characteristics of Ti-45Al-2Nb-2Mn+0.8vol.% TiB2 XD alloy

In Situ Observations of the Deformation Behavior and Fracture Mechanisms of Ti-45Al-2Nb-2Mn + 0.8 vol pct TiB2

Growth behavior of TiB2 hexagonal plates prepared via a molten‐salt‐mediated carbothermal reduction

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Product

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Growth behavior of TiB₂ hexagonal plates prepared via a molten‐salt‐mediated carbothermal reduction