Deformation processes related to interfacial boundaries in two-phase γ-titanium aluminides

Appel, F.; Beaven, P. A.; Wagner, Richard

doi:10.1016/0956-7151(93)90191-t

Cited by 195 publications

(49 citation statements)

References 22 publications

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“…Thus, conventional transmission electron microscopy (TEM) imaging techniques have been coupled with high resolution electron microscopy (HREM) to characterize the relevant processes. [8] …”

Section: Experimental Methodsmentioning

confidence: 99%

Recent Progress in the Development of Gamma Titanium Aluminide Alloys

Appel¹,

Brossmann²,

Christoph³

et al. 2000

Adv. Eng. Mater.

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367

103

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Intermetallic titanium aluminides offer an attractive combination of low density and good oxidation and ignition resistance with unique mechanical properties. These involve high strength and elastic stiffness with excellent high temperature retention. Thus, they are one of the few classes of emerging materials that have the potential to be used in demanding high‐temperature structural applications whenever specific strength and stiffness are of major concern. However, in order to effectively replace the heavier nickel‐base superalloys currently in use, titanium aluminides must combine a wide range of mechanical property capabilities. Advanced alloy designs are tailored for strength, toughness, creep resistance, and environmental stability. These concerns are addressed in the present paper through global commentary on the physical metallurgy and associated processing technologies of γ‐TiAl‐base alloys. Particular emphasis is paid on recent developments of TiAl alloys with enhanced high‐temperature capability.

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“…Thus, conventional transmission electron microscopy (TEM) imaging techniques have been coupled with high resolution electron microscopy (HREM) to characterize the relevant processes. [8] …”

Section: Experimental Methodsmentioning

confidence: 99%

Recent Progress in the Development of Gamma Titanium Aluminide Alloys

Appel¹,

Brossmann²,

Christoph³

et al. 2000

Adv. Eng. Mater.

Self Cite

367

103

View full text Add to dashboard Cite

show abstract

“…They have the characteristics of high temperature stability, good creep resistance and relatively high yield strength. 1,2) Their superb properties have found applications in aerospace and automotive applications. 3,4) The interdiffusion and interreaction phenomena of the Ti-Al diffusion couple system have previously been studied in detail.…”

Section: Introductionmentioning

confidence: 99%

Interreactions of TiAl3 Thin Film on Bulk γ-TiAl and on Bulk α2-Ti3Al Alloys at 700—1000°C

Chu

2004

Mater. Trans.

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Interreactions of diffusion couples of TiAl 3 film on bulk -TiAl and TiAl 3 film on bulk 2 -Ti 3 Al are investigated at high temperature. Experimental results show that TiAl 2 layer and TiAl 2 /-TiAl mixed layers are observed at the interfaces of TiAl 3 film/bulk -TiAl and TiAl 3 film/bulk 2 -Ti 3 Al diffusion couples, respectively, at 700$1000C. In addition, the growth rates of TiAl 2 and -TiAl product layers comply well with a parabolic law. The growth activation energy, Q k , of the TiAl 2 phase in the TiAl 3 film/bulk -TiAl system is calculated as 158.9 kJ/ mol, and Q k values of -TiAl and TiAl 2 phases in TiAl 3 film/bulk 2 -Ti 3 Al system are 163.4 kJ/mol and 147.9 kJ/mol, respectively. These Q k values are similar in magnitude with those of TiAl 3 phase formation in Ti-Al thin film diffusion systems. In this study, TiAl 2 formation is suggested to have been nucleated at the interface during the heating prior to reaching the set temperature.

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“…In PST TiAl crystals, the interfacial dislocations and/or ledges on y/y and ~z/Y lamellar interfaces act as potent sites for twin generation of {111)<112] true-twinning type in 7-TiAl lamellae [6,28,32]. Though not as effective as the lamellar interfaces in PST crystals, grain boundaries in single-phase 7-TiAI polycrystals are observed to be sites of twin nucleation [5,19,31].…”

Section: Discussionmentioning

confidence: 99%

Deformation twinning in TiAl: Effects of defect clustering

Yoo

Hishinuma²

1997

Metals and Materials

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Possible roles of point defect clustering in the formation of deformation twins in 7-TiAI are critically assessed by reviewing the available models of dislocation-assisted twin nucleation and experimental data on deformation twinning in Ti-56 at.% A1 single crystals and two-phase Ti-47 at.% A1 alloys. According to the pole mechanism for twinning in the Llo structure, a reasonable combination of the stress concentration (n-~ 27) and the vacancy supersaturation (c/c,~ 13) is needed to overcome the critical stages of twin formation. The so-called radiation-induced ductility reported in Ti-47 at.% A1 alloys is attributed to the effective formation of twin embryos in the presence of interstitial-type Frank loops and the subsequent nucleation and growth of twins during plastic deformation.

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Deformation processes related to interfacial boundaries in two-phase γ-titanium aluminides

Cited by 195 publications

References 22 publications

Recent Progress in the Development of Gamma Titanium Aluminide Alloys

Recent Progress in the Development of Gamma Titanium Aluminide Alloys

Interreactions of TiAl<SUB>3</SUB> Thin Film on Bulk γ-TiAl and on Bulk α<SUB>2</SUB>-Ti<SUB>3</SUB>Al Alloys at 700—1000°C

Deformation twinning in TiAl: Effects of defect clustering

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Deformation processes related to interfacial boundaries in two-phase γ-titanium aluminides

Cited by 195 publications

References 22 publications

Recent Progress in the Development of Gamma Titanium Aluminide Alloys

Recent Progress in the Development of Gamma Titanium Aluminide Alloys

Interreactions of TiAl<SUB>3</SUB> Thin Film on Bulk &gamma;-TiAl and on Bulk &alpha;<SUB>2</SUB>-Ti<SUB>3</SUB>Al Alloys at 700&mdash;1000&deg;C

Deformation twinning in TiAl: Effects of defect clustering

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Interreactions of TiAl<SUB>3</SUB> Thin Film on Bulk γ-TiAl and on Bulk α<SUB>2</SUB>-Ti<SUB>3</SUB>Al Alloys at 700—1000°C