Dislocation–Twin Boundary Interactions Induced Nanocrystalline via SPD Processing in Bulk Metals

Zhang, Fucheng; Feng, Xuelei; Yang, Zhinan; Kang, Jie; Wang, Tiansheng

doi:10.1038/srep08981

Cited by 29 publications

(13 citation statements)

References 42 publications

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“…The formation mechanism of steps along TBs ( Fig. 6a ) during dislocation–TB interaction has been studied previously 54 55 . Numerous experiments 40 and molecular dynamics simulations 56 57 showed that when an extended dislocation is forced by an external stress into a coherent TB, it recombines or constricts into a perfect dislocation configuration at the coherent TB and then slips through the boundary by splitting into three partials.…”

Section: Discussionmentioning

confidence: 99%

Dual mechanisms of grain refinement in a FeCoCrNi high-entropy alloy processed by high-pressure torsion

Song

et al. 2017

Sci Rep

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An equiatomic FeCoCrNi high-entropy alloy with a face-centered cubic structure was fabricated by a powder metallurgy route, and then processed by high-pressure torsion. Detailed microscopy investigations revealed that grain refinement from coarse grains to nanocrystalline grains occurred mainly via concurrent nanoband (NB) subdivision and deformation twinning. NB–NB, twin–NB and twin–twin interactions contributed to the deformation process. The twin–twin interactions resulted in severe lattice distortion and accumulation of high densities of dislocations in the interaction areas. With increasing strain, NB subdivision and interactions between primary twins and inclined secondary stacking faults (SFs)/nanotwins occurred. Secondary nanotwins divided the primary twins into many equiaxed parts, leading to further grain refinement. The interactions between secondary SFs/nanotwins associated with the presence of Shockley partials and primary twins also transformed the primary twin boundaries into incoherent high-angle grain boundaries.

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Section: Discussionmentioning

confidence: 99%

Dual mechanisms of grain refinement in a FeCoCrNi high-entropy alloy processed by high-pressure torsion

Song

et al. 2017

Sci Rep

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“…The curved twin boundaries can result from the interaction between gliding dislocations inside twins and twin boundaries by a severe plastic deformation (SPD) during cold rolling and the dislocations accumulation at twin boundaries. Zhang et al[16] investigated on dislocation-twin boundary interaction in Hadfield steel (X120Mn12), with stacking fault energy 48 mJ/m 2 , during a SPD process.…”

mentioning

confidence: 99%

Static recrystallization behaviour of cold rolled Mg-Zn-Y alloy and role of solute segregation in microstructure evolution

et al. 2017

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We examined the microstructure and texture evolution during the recrystallization annealing of cold rolled Mg-1Y and Mg-0.2Zn-1Y alloys. At the early annealing stage, new grains are nucleated on subunits with 200-300 nm surrounded by dislocation walls within shear bands. The Zn and Y addition reduced the stacking fault energy which results in the high activity of non-basal deformation mechanisms and formation of segregation zones along the stacking faults. This causes the orientation of recrystallization nuclei to be effectively retained so that the texture weakens during the recrystallization without reducing the basal pole split into the sheet transverse direction.

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“…Study showed that for hexagonal close-packed (hcp) metals deformation twinning occurs at the early stage of SPD, and is considered as an additional deformation mechanism to dislocation slip [7]. Dislocation-twin boundary interactions were also reported to play important roles in grain refinement, which may be a type of surface nanocrystallisation mechanism for metals with medium stacking fault energy (SFE) [8]. Titanium alloy has a medium SFE with the value of about 300 mJ m −2 [9].…”

mentioning

confidence: 99%

Strain‐induced gradient crystalline evolution mechanism of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si during ultrasonic impacting and rolling process

Liu

Xue

Zhao³

2017

Micro & Nano Letters

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This study investigates the gradient crystalline evolution mechanism of titanium alloy Ti-6.5Al-3.5Mo-1.5Zr-0.3Si during ultrasonic impacting and rolling process (UIRP). Microscopic observations indicated that dislocation movement is quite active at the early stage of plastic deformation, but twinning soon dominates the plastic deformation in the following long period of time. The very high energy density provided by the UIRP generates a surprisingly large number of epitaxy stacking faults despite the high energy they require. The actual atomic layers present a topological structure, facilitating the conversion between intrinsic stacking faults and epitaxy stacking faults, promoting the generation of twins, partial dislocations, and their intersection. After grains are refined to nano-scale, dislocation slip again becomes the main deformation mode. In addition, beamlike secondary α-phase and laminar secondary α-phase were observed precipitating in β-substrate. These secondary α-phases could reduce the dislocation slip resistance and improve the elongation, thus contributing to improve the plasticity of alloy.

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Dislocation–Twin Boundary Interactions Induced Nanocrystalline via SPD Processing in Bulk Metals

Cited by 29 publications

References 42 publications

Dual mechanisms of grain refinement in a FeCoCrNi high-entropy alloy processed by high-pressure torsion

Dual mechanisms of grain refinement in a FeCoCrNi high-entropy alloy processed by high-pressure torsion

Static recrystallization behaviour of cold rolled Mg-Zn-Y alloy and role of solute segregation in microstructure evolution

Strain‐induced gradient crystalline evolution mechanism of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si during ultrasonic impacting and rolling process

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