Effects of stacking fault energy on deformation induced grain boundary relaxation in nanograined Cu alloys

Sun, Yufeng; Luo, Z.P.; Li, X. Y.; Lu, K.

doi:10.1016/j.actamat.2022.118256

Cited by 28 publications

(3 citation statements)

References 63 publications

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“…Pinning points increase the thermodynamic driving force required for dislocation motion. [28,29] Thus, the modulation of dislocation motion is applied for a uniform mechanical property improvement of metallic materials. With a pulse magnetic field, the electron spin direction is changed in the solute-dislocation radical pairs.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field‐Assisted Laser Shock Peening of Ti₆Al₄V Alloy

Qian

Cai

et al. 2023

Adv Eng Mater

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Laser shock peening is widely used in mechanical property improvements of metallic materials. One concerning factor is the nonuniformity of mechanical properties and microstructures, such as surface hardness and grain refinement. Herein, a new strengthening strategy that integrates femtosecond laser shock peening and pulse magnetic field that can uniformize the performance of metallic materials is proposed. With the magnetic field‐assisted laser shock peening (MFLSP), the reduction of preferred‐clustering points shows uniform grain refinement with the maximum area fraction of small grains. The fabrication of uniform grain refinement is attributed to the dislocation redistribution by the release of pinning effect. With magnetic field stimulation, dislocation lines are observed to disperse from low‐angle grain boundary to the intragranular area. Dislocation behaviors stimulated by magnetic field are attributed to atomic migration. The dispersed dislocations serve as potential glide sources for grain refinement during laser‐induced plastic deformation. The enhanced grain refinement results in uniform surface hardening of metallic materials. The application of this integrated strategy with laser processing and external energy field can be used for adjusting mechanical properties of metallic materials with uniform microstructures and surface hardness.

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Section: Introductionmentioning

confidence: 99%

Magnetic Field‐Assisted Laser Shock Peening of Ti₆Al₄V Alloy

Qian

Cai

et al. 2023

Adv Eng Mater

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“…Moreover, previous studies have proposed that multiple deformation behaviors, including dislocation gliding, deformation twinning and phase transformation, have been observed in some HEAs due to their much lower stacking fault energy (SFE) [16,18]. Alloying usually brings lower or even negative SFEs for HEAs [19][20][21][22][23][24][25][26], e.g. − 48-15 mJ m 2 for CoNiCrFeMn HEA [27], and −43-30 mJ m 2 for NiCoCr medium-alloy (MEA) [28].…”

Section: Introductionmentioning

confidence: 99%

Effect of loading orientation on plasticity in nano-laminated CoNiCrFeMn dual-phase high-entropy alloy: a molecular dynamics study

Shuang¹,

Liang²,

Yu³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

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Dual-phase high-entropy alloys (DP-HEAs) have been proved to be a kind of promising materials that exhibit a combination of excellent strength and ductility. Previous studies have emphasized the effect of interface and phase volume fraction on mechanical performance in DP-HEAs. However, the deformation mechanisms such as interplays between dislocations and the constituent phases have not been fully understood. Particularly, the research concerning plastic anisotropy in DP-HEAs is still lacking. Here, molecular dynamics simulations are performed to probe the effect of loading orientation on plasticity in the nano-laminated face-centered cubic (FCC)/hexagonal close-packed (HCP) CoNiCrFeMn DP-HEA. Results reveal that a switch from strengthening to softening and back to strengthening is closely related to the activation of different slip systems when tailoring the inclination angles of the nanolaminates with respect to the tensile direction from 0° to 90°. Slip transfer across phase boundaries, phase transformation and the nucleation of shear bands dominate the plasticity in the samples with low, medium and high inclination angles, respectively. Furthermore, the evolution of microstructures, such as dislocations, stacking faults, and FCC/HCP phase are analyzed to study the underlying deformation mechanisms. These results can help understand the plastic anisotropy of DP-HEAs and design alloys with excellent mechanical properties for engineering applications.

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“…Another hardness enhancement mechanism that is completely different from diamond is the defect (twinning)-induced structural stabilizing mechanism in B 4 C, which reduces energy by releasing the native strains built in the single crystal, forming a highly nanotwinned structure that is more stable than the single-crystal structure . The structural twinning approach has mainly been applied to study the structural and mechanical properties of metals and strong covalent solids with simple structures that exhibit improved and more versatile mechanical characteristics. − A pressing task is to explore fascinating nanotwinned structures in various covalent solids with complex bond structures, which may lead to the optimization of mechanical properties and fundamental understanding of the underlying physics. − Herein, we selected single-crystal B 13 CN (sc-B 13 CN) with improved structural stability and mechanical properties as a structural prototype to construct nanotwinned B 13 CN (nt-B 13 CN). We subsequently analyzed the mechanical properties and structural deformation modes of nt-B 13 CN under large strains.…”

mentioning

confidence: 99%

Structural and Stress Response of Nanotwinned B₁₃CN under Large Strains

Liang,

Wang,

Song

et al. 2023

J. Phys. Chem. Lett.

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Boron-rich carbides with icosahedral cages as pivotal structural units, which exhibit high hardness and low density, have promising industrial applications. However, the insufficient fracture toughness of these materials hinders their engineering applications. A recent first-principles study revealed that single-crystal B 13 CN (sc-B 13 CN) exhibits interesting structural deformation modes and superior mechanical properties to boron-rich carbides, prompting us to further explore this intriguing material. Herein, we adopted sc-B 13 CN as an archetypal system owing to its excellent structural and mechanical properties to construct nanotwinned B 13 CN (nt-B 13 CN) and explore its mechanical properties and structural deformation modes under large strains. We unraveled the specific stress−strain relationship of nt-B 13 CN and the considerable effect of twinning on its structural deformation modes under diverse loading conditions. Our results indicate that twinning leads to interesting structural deformation patterns and is extremely beneficial to improving the structural stability and mechanical properties of boron-rich materials. The current results provide an improved understanding of the theoretical design for various nanotwinned boron-rich materials with intricate bonding configurations.

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Effects of stacking fault energy on deformation induced grain boundary relaxation in nanograined Cu alloys

Cited by 28 publications

References 63 publications

Magnetic Field‐Assisted Laser Shock Peening of Ti₆Al₄V Alloy

Magnetic Field‐Assisted Laser Shock Peening of Ti₆Al₄V Alloy

Effect of loading orientation on plasticity in nano-laminated CoNiCrFeMn dual-phase high-entropy alloy: a molecular dynamics study

Structural and Stress Response of Nanotwinned B₁₃CN under Large Strains

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Effects of stacking fault energy on deformation induced grain boundary relaxation in nanograined Cu alloys

Cited by 28 publications

References 63 publications

Magnetic Field‐Assisted Laser Shock Peening of Ti6Al4V Alloy

Magnetic Field‐Assisted Laser Shock Peening of Ti6Al4V Alloy

Effect of loading orientation on plasticity in nano-laminated CoNiCrFeMn dual-phase high-entropy alloy: a molecular dynamics study

Structural and Stress Response of Nanotwinned B13CN under Large Strains

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Magnetic Field‐Assisted Laser Shock Peening of Ti₆Al₄V Alloy

Magnetic Field‐Assisted Laser Shock Peening of Ti₆Al₄V Alloy

Structural and Stress Response of Nanotwinned B₁₃CN under Large Strains