The relationship between fracture toughness and microstructure of fully lamellar TiAl alloy

Zheng, Ruiting; Cheng, Guo An; Li, X. J.; Cao, Guoxin; Fu, Liangjie; Zhang, Y. G.; Chen, C. Q.

doi:10.1007/s10853-006-1382-z

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…With large colonies, also, fracture properties can become somewhat stochastic [10]. With smaller colonies, a clear tendency towards increasing toughness with increasing colony size is found [20,27,28]. This is as a priori expected from fracture mechanics: increasing the colony size, and hence the ligament width and length, increases the fracture energy if all else is constant.…”

Section: Introductionmentioning

confidence: 56%

Fracture of convoluted and lamellar α2 + γ TiAl alloys

et al. 2012

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Section: Introductionmentioning

confidence: 56%

Fracture of convoluted and lamellar α2 + γ TiAl alloys

et al. 2012

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“…The fracture behavior of alloys with anisotropic columnar grains or coarse FL microstructure has been investigated in detail [18,20,41]. Therefore, the attention is mainly focused on the TiB 2 -induced toughness mechanism in the present work.…”

Section: Toughing Mechanism In Tib 2 -Containing Alloysmentioning

confidence: 99%

“…Previous studies [18,20,41] confirmed that the colony size plays a significant role in the fracture toughness and fine grains always result in the deterioration of fracture toughness [42]. Zheng [20] found that for fine-grained TiAl the crack path is relatively straight with small ligament, and the fracture toughness is low, while according to Fig. 8(d, e), the crack path is tortuous rather than straight, and a certain number of lamellar colonies are traversed by the crack in trans-lamellar mode.…”

Section: Deformed Ligament Bridges Acting As Ductile-phase Particlesmentioning

confidence: 99%

“…In addition, the colony size and lamellae spacing can influence the fracture behavior in TiAl alloys. Kim [18] demonstrated that fully lamellar (FL) TiAl with colony size of $ 350 μm exhibited superior fracture toughness (15.16 MPa m À 1/2 ), while Chan [19] and Zheng [20] reported the preferred fracture toughness at a colony size of 600 μm (29.7 MPa m À 1/2 and 30.8 MPa m À 1/2 , respectively) which was obtained through appropriate heat treatment. Chan [21] and Kim [22] reported that both of the initiation toughness and crack growth resistance increased with decreasing lamellae spacing.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure characterization, mechanical properties and toughening mechanism of TiB 2 -containing conventional cast TiAl-based alloy

Han

Xiao

Tian

et al. 2015

Materials Science and Engineering: A

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“…130 [32], 175 [33], 207 [12], 275 [34] and 300 MPa [35]. Stress levels of 125, 175, 275, 325, 375 and 425 MPa are considered in our simulations for different types of external stresses for this parametric study.…”

Section: Nucleation and Evolution Of G Precipitates Under Normal Strementioning

confidence: 99%

Effect of external stress on γ nucleation and evolution in TiAl alloys

Teng

et al. 2015

Intermetallics

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a b s t r a c tWe have shown in a previous paper that twin boundary area fraction in lamellar g-TiAl based alloys depends on collective or correlated nucleation induced by long-range elastic interactions among nucleating precipitates or between pre-existing and nucleating precipitates. In this study we investigate the effects of applied stresses on g nucleation and evolution by elastic interaction energy calculations and phase field simulations. It is found that the elastic interaction energy reaches minimum when two variants are twin related because of their self-accommodation of the coherency strain. When external stresses are present, such autocatalysis during nucleation could be either enhanced or suppressed.Compression perpendicular or tension parallel to the basal plane of the a phase is found to enhance the internal elastic interactions between nucleating precipitates, promote twin variant selection and reduce the overall nucleation rate, while isostatic pressing, compression parallel, tension perpendicular to the basal plane does the opposite. Shear along the interface always reduce the twin boundary area fraction, regardless of the shear direction. These findings could shed light on optimizing processing routes to increase twin boundary area fraction in lamellar microstructures of g-TiAl based alloys.

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The relationship between fracture toughness and microstructure of fully lamellar TiAl alloy

Cited by 12 publications

References 15 publications

Fracture of convoluted and lamellar α2 + γ TiAl alloys

Fracture of convoluted and lamellar α2 + γ TiAl alloys

Microstructure characterization, mechanical properties and toughening mechanism of TiB 2 -containing conventional cast TiAl-based alloy

Effect of external stress on γ nucleation and evolution in TiAl alloys

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