Mechanism of grain growth during severe plastic deformation of a nanocrystalline Ni-Fe alloy

@article{Wang2009MechanismOG,
  title={Mechanism of grain growth during severe plastic deformation of a nanocrystalline Ni-Fe alloy},
  author={Yanbo Wang and James C. Ho and Xiaozhou Liao and Hui Li and Simon P. Ringer and Yuntian Zhu},
  journal={Applied Physics Letters},
  year={2009},
  volume={94},
  pages={011908}
}
Deformation induced grain growth has been widely reported in nanocrystalline materials. However, the grain growth mechanism remains an open question. This study applies high-pressure torsion to severely deform bulk nanocrystalline Ni-20 wt % Fe disks and uses transmission electron microscopy to characterize the grain growth process. Our results provide solid evidence suggesting that high pressure torsion induced grain growth is achieved primarily via grain rotation for grains much smaller than… Expand

Figures from this paper

Grain growth and dislocation density evolution in a nanocrystalline Ni–Fe alloy induced by high-pressure torsion
The structural evolution of a nanocrystalline Ni–Fe alloy induced by high-pressure torsion (HPT) was investigated. HPT-induced grain growth occurred via grain rotation and coalescence, formingExpand
Stress-driven grain refinement in a microstructurally stable nanocrystalline binary alloy
Abstract Deformation-induced grain-growth in nanocrystalline materials is a widely-reported phenomenon that has been attributed to grain boundary (GB) processes. In this paper, we report on theExpand
Dislocation density evolution during high pressure torsion of a nanocrystalline Ni–Fe alloy
High-pressure torsion (HPT) induced dislocation density evolution in a nanocrystalline Ni-20 wt %Fe alloy was investigated using x-ray diffraction and transmission electron microscopy. ResultsExpand
Simultaneous Grain Growth and Grain Refinement in Bulk Ultrafine-Grained Copper under Tensile Deformation at Room Temperature
Grain growth and grain refinement behavior during deformation determine the strength and ductility of ultrafine-grained materials. We used asymmetric cryorolling to fabricate ultrafine-grained copperExpand
Grain size and alloying effects on dynamic recovery in nanocrystalline metals
Abstract Dynamic recovery in nanocrystalline Ni and Ni50Fe50 with respective grain sizes of 65 nm and 15 nm is studied using stress reduction tests during in situ X-ray diffraction. The results areExpand
Strain softening in nanocrystalline Ni–Fe alloy induced by large HPT revolutions
Abstract The influence of strain on the hardness of an electrochemically deposited nanocrystalline Ni–20 wt.% Fe alloy processed by high-pressure torsion (HPT) for 20 and 30 revolutions wasExpand
High-pressure torsion-induced grain growth and detwinning in cryomilled Cu powders
Two mechanisms for deformation-induced grain growth in nanostructured metals have been proposed, including grain rotation-induced grain coalescence and stress-coupled grain boundary (GB) migration. AExpand
Grain Size Effect on Deformation Twinning and De-Twinning in a Nanocrystalline Ni-Fe Alloy
The effect of grain size on the deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy was investigated using transmission electron microscopy. Specimens with different grain sizesExpand
Anomalous Strain Rate Sensitivity of Nanocrystalline Ni Induced by Rolling Deformation
The strain rate sensitivity of rolled nanocrystalline (NC) Ni was studied by nanoindentation. The grain continuously grows from 20 nm to 92 nm after rolling deformation. The stress driven grainExpand
A brief overview on grain growth of bulk electrodeposited nanocrystalline nickel and nickel-iron alloys
Abstract This review focuses on grain growth behaviors and the underlying mechanisms of bulk electrodeposited nanocrystalline nickel and nickel-iron alloys. Effects of some important factors on grainExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 23 REFERENCES
Stress-assisted discontinuous grain growth and its effect on the deformation behavior of nanocrystalline aluminum thin films
Unique mechanical properties have been measured in submicrometer freestanding nanocrystalline Al films, where discontinuous grain growth results in a fundamental change in the way in which theExpand
Orientation-dependent grain growth in a bulk nanocrystalline alloy during the uniaxial compressive deformation
The microstructural evolution during the uniaxial compression of an as-deposited bulk nanocrystalline (nc) Ni–Fe (average grain size d≈23nm) at ambient temperature was investigated by the high-energyExpand
Grain Boundary-Mediated Plasticity in Nanocrystalline Nickel
TLDR
Observations of nanocrystalline nickel films with an average grain size of about 10 nanometers show that grain boundary–mediated processes have become a prominent deformation mode, and trapped lattice dislocations are observed in individual grains following deformation. Expand
High-pressure torsion-induced grain growth in electrodeposited nanocrystalline Ni
Deformation-induced grain growth has been reported in nanocrystalline (nc) materials under indentation and severe cyclic loading, but not under any other deformation mode. This raises an issue onExpand
Deformation-induced grain rotation and growth in nanocrystalline Ni
Nanobeam electron diffraction and a series of dark field images techniques were used to investigate the deformation mechanisms of nanocrystalline (nc) Ni in response to in situ tensile deformationExpand
Grain growth behavior at absolute zero during nanocrystalline metal indentation
The authors show using atomistic simulations that stress-driven grain growth can be obtained in the athermal limit during nanocrystalline aluminum indentation. They find that the grain growth resultsExpand
Grain boundary migration during room temperature deformation of nanocrystalline Ni
We report simulation results showing grain boundary motion in nanocrystalline Ni. The sample, containing 200 grains of 5 nm average grain size, was deformed to strain levels up to 12% at roomExpand
Mechanical grain growth in nanocrystalline copper.
TLDR
It is found that high purity and nonequilibrium structure are necessary conditions for mechanical grain growth and methods can be devised to avoid low temperature grain growth. Expand
Rapid stress-driven grain coarsening in nanocrystalline Cu at ambient and cryogenic temperatures
There have been long-standing concerns about the stability of the internal structure of nanocrystalline metals. In this letter we examine grain growth in nanocrystalline Cu under the microhardnessExpand
Uniaxial tensile plastic deformation and grain growth of bulk nanocrystalline alloys
Abstract The uniaxial tensile behavior of as-deposited bulk nanocrystalline (nc) Ni–Fe (average grain size d  ≈ 23 nm) and Co–P ( d  ≈ 12 nm) alloys was investigated. Both alloys have a high strengthExpand
...
1
2
3
...