Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

Tao, Nengguo; Wu, Xiaolei; Sui, M. L.; Lü, Jian; Lu, K.

doi:10.1557/jmr.2004.0227

Cited by 118 publications

(49 citation statements)

References 20 publications

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“…Formation of DT at low strain (greater depths) is similar to the observations in other low SFE materials (Liu & Lu, 2000;Tao et al, 2004;Wang et al, 2006;Yan et al, 2012). With increasing strain, the formation of the ε-martensite within the DT and/or at the DT intersections is seen (state 4 of Fig.…”

Section: Microstructural Refinement Mechanismsupporting

confidence: 84%

Microstructural Characterization of SS304 upon Various Shot Peening Treatments

Cho

et al. 2015

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Plastic deformation was introduced to the austenitic (γ) stainless steel of SS304 by air blast shot peening, ultrasonic shot peening, and ultrasonic nanocrystalline surface modification. Various deformation structures were formed. The hardness, the deformation structure and the underlying grain refinement mechanism were investigated. In the deformed region, planar dislocation arrays and deformation twin (DT), the DT-DT intersection and ε-martensite structures, and α'-martensite were formed in the respective regions of low, medium, and high strain. The grain refinement mechanism is found to be closely related to the 1) sub-division of coarse grains by DT, shear bands and their intersection, and 2) formation of nano-sized α'-martensite due to the high plastic deformation.

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Section: Microstructural Refinement Mechanismsupporting

confidence: 84%

Microstructural Characterization of SS304 upon Various Shot Peening Treatments

Cho

et al. 2015

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“…The samples used for experimental studies have been prepared by mechanical attrition [65], physical vapor deposition [6], high-pressure torsion [8], surface mechanical attrition [223], electro-deposition [35,40,41,68], inert gas condensation [15], etc. Each of these methods may have its own intrinsic issue such as impurities, unclean grain boundaries, and non-equilibrium grain boundaries.…”

Section: Experimental Observationsmentioning

confidence: 99%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

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1,141

447

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“…Various SPD variants have been developed, such as equal-channel angular pressing (ECAP) [1,2], high-pressure torsion (HPT) [1], accumulated roll bonding (ARB) [3], slide loading [4] and surface mechanical attrition treatment (SMAT) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt

Tao

Wei

et al. 2007

Acta Materialia

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Nanocrystalline intermetallic Co 3 Fe 7 was produced on the surface of cobalt via surface mechanical attrition (SMA). Deformationinduced diffusion entailed the formation of a series of solid solutions. Phase transitions occurred depending on the atomic fraction of Fe in the surface solid solutions: from hexagonal close-packed (<4% Fe) to face-centered cubic (fcc) (4-11% Fe), and from fcc to body-centered cubic (>11% Fe). Nanoscale compositional probing suggested significantly higher Fe contents at grain boundaries and triple junctions than grain interiors. Short-circuit diffusion along grain boundaries and triple junctions dominate in the nanocrystalline intermetallic compound. Stacking faults contribute significantly to diffusion. Diffusion enhancement due to high-rate deformation in SMA was analyzed by regarding dislocations as solute-pumping channels, and the creation of excess vacancies. Non-equilibrium, atomic level alloying can then be ascribed to deformation-induced intermixing of constituent species. The formation mechanism of nanocrystalline intermetallic grains on the SMA surface can be thought of as a consequence of numerous nucleation events and limited growth.

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Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

Cited by 118 publications

References 20 publications

Microstructural Characterization of SS304 upon Various Shot Peening Treatments

Microstructural Characterization of SS304 upon Various Shot Peening Treatments

Deformation twinning in nanocrystalline materials

Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt

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