Tuning the microstructure and mechanical properties of TiAl-based alloy through grain boundary engineering

Xuanyuan, Yaodong; Li, Hongjun; Huang, Ming; Yan, Yinbiao; Yang, Sen

doi:10.1016/j.jmrt.2022.05.023

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…

is the average local misorientation;

represents the shear modulus;

means the burgers vector;

stands for the step size. According to the studies [ 36 , 37 , 38 ], the values of

, and

were 3, 39 GPa, and 0.128 nm, respectively. In this study, the step size

was 0.3 μm.…”

Section: Resultsmentioning

confidence: 99%

“…When annealed for 120 and 180 min, the stored energy was almost consumed, and the grain boundary migration rate became slower after full recovery, which is not conducive to forming annealing twins [ 43 ]. Meanwhile, for the reduction of the interface energy of the system, the disappearance of low-ΣCSL boundaries can occur during grain growth [ 38 ]. It can explain the slight decline in the fraction of low-Σ CSL boundaries after further extending the annealing time from 120 min to 180 min ( Figure 8 a).…”

Section: Resultsmentioning

confidence: 99%

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Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Feng,

Zhou,

Wang

et al. 2024

Materials

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In this study, the grain boundary character distribution (GBCD) of a B10 alloy was optimized, employing thermomechanical processing consisting of friction stirring processing (FSP) and annealing treatment. Using electron backscatter diffraction, the effects of rotational speed of FSP and annealing time on the evolution of GBCD were systematically investigated. The GBCD evolution was analyzed concerning various parameters, such as the fraction of low-Σ coincidence site lattice (CSL) boundaries, the average number of grains per twin-related domain (TRD), the length of longest chain (LLC), and the triple junction distribution. The experimental results revealed that the processing of a 1400 rpm rotational speed of FSP followed by annealing at 750 °C for 60 min resulted in the optimum grain boundary engineering (GBE) microstructure with the highest fraction of low-Σ CSL boundaries being 82.50% and a significantly fragmented random boundary network, as corroborated by the highest average number of grains per TRD (14.73) with the maximum LLC (2.14) as well as the highest J2/(1 − J3) value (12.76%). As the rotational speed of FSP increased from 600 rpm to 1400 rpm, the fraction of low-Σ CSL boundaries monotonously increased. The fraction of low-Σ CSL boundaries first increased and then decreased with an increase in annealing time. The key to achieving GBE lies in inhibiting the recrystallization phenomenon while stimulating abundant multiple twinning events through strain-induced boundary migration.

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“…

is the average local misorientation;

represents the shear modulus;

means the burgers vector;

stands for the step size. According to the studies [ 36 , 37 , 38 ], the values of

, and

were 3, 39 GPa, and 0.128 nm, respectively. In this study, the step size

was 0.3 μm.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Feng,

Zhou,

Wang

et al. 2024

Materials

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show abstract

“…Common microscopic indices for characterizing plasticity include the Schmid and geometrical compatibility factors, which represent the degree of difficulty of the intragranular slip and slip-twinning transmission through GBs, respectively. Explorations about plasticizing mechanisms primarily focus on the overall influence of various microscopic structures on properties such as the recrystallization texture, dislocation density, and Taylor factor [ 11 , 12 , 13 , 14 , 15 ] or analyzing the effect of the length and quantity ratio of all the special boundaries [ 16 , 17 , 18 , 19 , 20 ]. However, the microscopic essence of plastic deformation is the dislocation slip and twinning.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Σ3 Boundaries, Dislocation Slip, and Plasticity in Pure Nickel

2023

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This study investigated the relationship between the Σ3 boundaries, dislocation slip, and plasticity in pure nickel wires after grain boundary (GB) modification. Both quasi in situ tensile tests and simulations were employed. During plastic deformation, twins surrounded by Σ3 boundaries may exhibit a good deformation coordination. With an increase in strain, the slip systems corresponding to the maximum Schmid factor and the actual activated slip systems remain unchanged. Even sub-grains can maintain the dominant slip system of their origin matrix grains. Slip systems with slip planes (111) and (1−1−1) are the most active. Moreover, random boundaries have strong hindering effects on dislocations, and the nearby stress accumulates continuously with an increase in strain. In contrast, Σ3 boundaries demonstrate weak blocking effects and can release the nearby stress due to their unique interfacial structures, which is favorable for improving plasticity. They are more penetrable for dislocations or may react with the piled dislocations. In addition, some Σ3 boundaries can improve their geometrical compatibility factor with an increase in the strain, which enhances the deformation coordination of the grains. The research results provide a better understanding of the plasticizing mechanism for face-centered cubic (fcc) materials after grain boundary modification.

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Microstructure evolution and phase transformation mechanism of Ti–46Al–8Nb–2.5V alloy based on phase transformation geometric models

Cao,

Han,

Wang

et al. 2023

Journal of Materials Research and Technology

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Tuning the microstructure and mechanical properties of TiAl-based alloy through grain boundary engineering

Cited by 4 publications

References 36 publications

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Relationship between Σ3 Boundaries, Dislocation Slip, and Plasticity in Pure Nickel

Microstructure evolution and phase transformation mechanism of Ti–46Al–8Nb–2.5V alloy based on phase transformation geometric models

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