Growth kinetics of discontinuous coarsening of lamellar structure in Ti–44at.%Al(–0.5at.%Cr) intermetallic compounds

Jung, Jae‐Young; Park, J.K.

doi:10.1016/s1359-6454(98)00103-7

Cited by 28 publications

(11 citation statements)

References 14 publications

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“…Jung and Park [9] have also reported a similar observation. This shows that the lamellar interface forms a high-angle boundary with the migrating grain boundary.…”

Section: Discussionsupporting

confidence: 58%

“…[9] The addition of Cr does not appear to cause a significant change in the growth kinetics. Based on the analysis of activation energy, it has been suggested that the driving force for the migration of the grain boundary is the elastic strain energy.…”

Section: Discussionmentioning

confidence: 97%

“…Qin and Hao [10] have also concluded that the elastic strain energy in the surface layer of the specimens has a great effect on the discontinuous coarsening reaction in the alloy Ti-42Al. Jung and Park [9] have argued that the chemical-and interfacial-free energies do not act as a driving force for the migration of grain boundary despite the comparatively large magnitude of their energies. This is based on the fact that chemical-free energy does not contribute due to the comparatively rapid volume diffusion in front of the migrating grain.…”

Section: Discussionmentioning

confidence: 99%

“…As a result, the mechanical properties deteriorate. The lamellar microstructure coarsens by discontinuous or continuous mode [8][9][10][11][12][13] at high temperatures. There is limited study on the understanding of the thermal stability of the lamellar structure in engineering alloys with the high Al contents (45 to 49 at.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of alloying and aging on morphological changes from lamellar to equiaxed microstructure of α 2+γ titanium aluminides

Sreenivasulu

Mukhopadhyay

Sastry

et al. 2005

Metall Mater Trans A

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The stability of a lamellar structure consisting of ␣ 2 and ␥ phases in alloys has been studied as a function of aging time and temperature. The alloys were solution treated (1400 °C, 30 min, and air-cooled (AC)) and aged at 1000 °C and 1100 °C for 1, 4, and 16 hours, respectively. The results indicate that the kinetics of lamellae to equiaxed transformation depends on alloy chemistry, aging time, and temperature. The Nb decreases and Mo increases the kinetics of transformation. The combined effect of Nb and Mo results in the highest volume fraction of equiaxed microstructure at a given aging time and temperature. The results have been discussed in relation to microstructural features and have been compared with those reported in other ␣ 2 ϩ ␥ alloys.

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“…Jung and Park [9] have also reported a similar observation. This shows that the lamellar interface forms a high-angle boundary with the migrating grain boundary.…”

Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of alloying and aging on morphological changes from lamellar to equiaxed microstructure of α 2+γ titanium aluminides

Sreenivasulu

Mukhopadhyay

Sastry

et al. 2005

Metall Mater Trans A

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“…With regard to the understanding of the deformability of TiAl alloy, there have been many studies in recent years and significant improvements in the mechanical properties and corrosion resistance of TiAl alloys have been achieved by microalloying and optimization of the microstructure. Several groups have studied the effect of ternary additions to binary alloys and found that V, Cr and Mn generally increase ductility of Ti-rich TiAl alloy [3][4][5][6][7][8][9] . It has been suggested that the transition metal elements (V, Cr and Mn) substitute for Al, reduce the covalency of the Ti-Al bond and thus increase the ductility of the alloy [5] .…”

Section: Introductionmentioning

confidence: 99%

The behavior of 3d electrons and defects in TiAl-based alloys containing V and Cu studied by positron annihilation

Deng

Chen

Jiang

et al. 2008

Sci. China Ser. G-Phys. Mech. Astron.

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Information of defects and 3d electrons in transition metals (Ti, V, Cu) andTiAl-based alloys (Ti 50 Al 50 , Ti 50 Al 48 V 2 , Ti 50 Al 48 Cu 2 ) can be extracted from the positron lifetime and coincidence Doppler broadening spectra. The results show that the 3d electron signals for the transition metals Ti, V and Cu increase with the number of 3d electrons. The 3d electron signal and the electron density for binary TiAl alloy are relatively low due to the (Ti)3d-(Al)3p interactions. The addition of V and Cu atoms to TiAl alloy leads to the increase in the electron densities in bulk and the defects on grain boundaries simultaneously, as well as the enhancement of the 3d electron signal. The 3d electron signal in the spectrum of Ti 50 Al 48 Cu 2 alloy is higher than that of Ti 50 Al 48 V 2 alloy.TiAl alloy, 3d electron, defect, positron annihilation

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Aluminium – Chromium – Titanium

Бочвар¹,

Fabrichnaya²,

Ivanchenko³

et al. 2009

Landolt-Börnstein - Group IV Physical Chemistry

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Growth kinetics of discontinuous coarsening of lamellar structure in Ti–44at.%Al(–0.5at.%Cr) intermetallic compounds

Cited by 28 publications

References 14 publications

Effect of alloying and aging on morphological changes from lamellar to equiaxed microstructure of α 2+γ titanium aluminides

Effect of alloying and aging on morphological changes from lamellar to equiaxed microstructure of α 2+γ titanium aluminides

The behavior of 3d electrons and defects in TiAl-based alloys containing V and Cu studied by positron annihilation

Aluminium – Chromium – Titanium

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