Microstructure, microsegregation pattern and the formation of B2 phase in directionally solidified Ti–46Al–8Nb alloy

Liu, Guohuai; Li, Xinzhong; Su, Yanqing; Liu, Dongmei; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.jallcom.2012.07.023

Cited by 34 publications

(10 citation statements)

References 34 publications

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“…Therefore, the slow growth rate could suppress the formation of the B 2 phase. As reported early by Liu [3], due to the fact that the Nb element is distributed homogeneously at low growth rates of 2 μm/s, there is no B 2 phase in the Ti-46Al-8Nb alloy.…”

Section: Effect Of Growth Rate On Microstructurementioning

confidence: 65%

“…Because of their excellent properties such as light weight, high modulus and high temperature strength as well as good oxidation resistance at elevated temperatures around 700°C to 900°C [1][2][3], γ-TiAl base alloys are supposed to be ideal material for application in the aerospace, automotive and power-generation industries. Generally, γ-TiAl base alloys, composed of a fine and fully laminated α 2 and γ dual phase microstructure, have attracted considerable attention since the 1990s [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of growth rate on microstructure and tensile properties of Ti–45Al–2Cr–2Nb prepared by electromagnetic cold crucible directional solidification

et al. 2015

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Section: Effect Of Growth Rate On Microstructurementioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Effect of growth rate on microstructure and tensile properties of Ti–45Al–2Cr–2Nb prepared by electromagnetic cold crucible directional solidification

et al. 2015

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“…They suggested that the addition of 7 at.% Mo stabilized the metastable β phase and offered a discrete activation barrier in TiAl alloys. Likewise, Lui et al held the view that the β phase enriched in Nb solutes leads to the precipitation of B2 phase at the core dendrites of TiAl [14]. This is what prompted us to address this phenomenon in this study by answering the following questions: do alloying solutes have an impact on mechanical stability behavior by forming the B2 phase in TiAl?…”

Section: Introductionmentioning

confidence: 86%

Theoretic quantum analysis of mechanical and electronic properties of TiAl‐M (M = Mo, W, Cu and Zn)

Ouadah

Merad

Abdelkader

2020

Int J of Quantum Chemistry

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TiAl alloys provide a significantly higher creep resistance at high temperatures. However, the low ductility of these alloys at room temperature is considered as a drawback when used as a turbine blade coating material. One way to increase the ductility is by introducing solutes in the chemical composition of TiAl. Surprisingly, a ductility promotion can be achieved through a phase transition from L10 to B2 phase when the concentrations of Mo, W, and Cu are about 12, 11 and 12.5 at.%, respectively, while there is no phase transformation for TiAl with the presence of Zn. This study will tackle the reason of this behavior by analyzing the enthalpy of formation, mechanical and thermodynamic properties, and electronic structure by performing first‐principles calculations.

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“…1c, d. The net-like Al segregation with black contrast and Nb segregation with white contrast exist in Ti-46Al-8Nb alloy, which mainly resulted from the peritectic reaction and low diffusivity of Nb [23]. The multiphase structure and high solute segregation in Ti-46Al-8Nb alloy may give rise to local flow and complex recrystallization process during hot deformation.…”

Section: Methodsmentioning

confidence: 99%

Hot Deformation Behavior and Microstructural Characteristics of Ti–46Al–8Nb Alloy

Liu

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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Hot deformation behavior, microstructural evolution and flow softening mechanism were investigated in Ti-46Al-8Nb alloy via isothermal compression approach. The true stress-strain curves exhibited typical work hardening and flow softening, in which the dependence of the peak stress on temperature and strain rate was obtained by hyperbolic sine equation with Zener-Hollomon (Z) parameter, and the activation energy was calculated to be 446.9 kJ/mol. The microstructural analysis shows that the alternate dark and light deformed ribbons of Al-rich and Nb-rich regions appeared and were associated with local flow involving solute segregation. The Al segregation promoted flow softening mainly arising from the recrystallization of c phase with low stacking fault energy. The coarse recrystallized c and several massive c phase were observed at grain boundaries. While in the case of Nb segregation, b/B2 phase harmonized bending of lamellae, combined with the growth of recrystallized c grains and a ? b ? c ? a ? c transition under conditions of temperature and stress, leading to the breakdown of a 2 /c lamellar colony. During the hot compression process, gliding and dissociation of dislocations occurred in c phase that acted as the main softening mechanism, leading to extensive c twins and cross twins in a/c lamellae and at grain boundaries. In general, homogeneous microstructure during the hot deformation process can be obtained in TiAl alloy with high Nb addition and low Al segregation. The deformation substructures intrinsically promote the formability of Ti-46Al-8Nb alloy.

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Microstructure, microsegregation pattern and the formation of B2 phase in directionally solidified Ti–46Al–8Nb alloy

Cited by 34 publications

References 34 publications

Effect of growth rate on microstructure and tensile properties of Ti–45Al–2Cr–2Nb prepared by electromagnetic cold crucible directional solidification

Effect of growth rate on microstructure and tensile properties of Ti–45Al–2Cr–2Nb prepared by electromagnetic cold crucible directional solidification

Theoretic quantum analysis of mechanical and electronic properties of TiAl‐M (M = Mo, W, Cu and Zn)

Hot Deformation Behavior and Microstructural Characteristics of Ti–46Al–8Nb Alloy

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