Tensile behavior and fracture in nickel and carbon doped nanocrystalline nickel

Xiao, Chenghe; Mirshams, Reza A.; Whang, S.H.; Yin, Weiyao

doi:10.1016/s0921-5093(00)01392-7

Cited by 141 publications

(60 citation statements)

References 14 publications

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“…[140] For example, Fig. 13 contrasts the YS of Ni after HPT or ECAP and rolling [141] with that of electrodeposited Ni [142][143][144] shown by the continuous line which corresponds to σ o ≈ 7 MPa and k y ≈ 5.7 MPa.mm 1/2 . For the latter condition, the grains contain no dislocation substructure and normal H-P behavior is observed.…”

Section: Superstrength By Spdmentioning

confidence: 99%

“…Superstrength in Ni subjected to ECAP and subsequent rolling; [140] the dashed line shows UFG Ni [141] and the solid line shows H-P behavior in nano-Ni fabricated by electroplating. [142][143][144] Figure 14. Schematic illustration of the H-P relationship in superstrong and conventional materials.…”

Section: Figure Captionsmentioning

confidence: 99%

“…Methods are also available for producing metals with grain sizes in the nanometer range that do not involve SPD processing such as in the use of electroplating. [59] Recently, a 5 nm grain size was obtained in Cu by applying a large sliding load in liquid nitrogen. [60] Many experimental results are now available on UFG materials and the techniques for characterizing them have also been developed.…”

Section: Introductionmentioning

confidence: 99%

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The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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Metals processed by severe plastic deformation [SPD] techniques, such as equal-channel angular pressing [ECAP] and high-pressure torsion [HPT], generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the HallPetch [H-P] relationship. Examples of this behavior are discussed using data on Ti, Al-Mg 1 and Ni. These materials typically have grain size above ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. High strength and ductility can be achieved simultaneously by imposing high strains to give both ultrafine grain sizes and a high fraction of high-angle grain boundaries. An example is presented for a cast Al-7% Si alloy processed by HPT. In some cases, SPD may produce a fine grain size but also lead to a weakening due to microstructural changes as in ECAP of an Al-7034 alloy and HPT of Zn-22% Al. In SPD-processed materials, grain boundary segregation and nanostructural features are present which may lead to higher strengths than those predicted by the H-P relationship in some alloys having nano grain sizes.

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Section: Superstrength By Spdmentioning

confidence: 99%

Section: Figure Captionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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“…An improved thermal stability of single-phase fcc Fe-Cu alloys resulted from solute segregation to nanocrystalline grain boundaries [51]. Electroplated nanocrystalline Ni doped with carbon or boron exhibit limited grain growth [52,53]. Suryanarayanan et al also reported that B doping is beneficial to the retardation of grain growth in nanocrystalline Cu powders during densification and heat treatments [54].…”

Section: Nanostructurementioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

842

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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“…Thus, several papers have reported electrodeposited bulk nanocrystalline metals and alloys with high strength and high ductility [4][5][6][7] . However, experimental results suggest that the tensile behavior of nanocrystalline Ni and Ni alloys is sensitive to segregation of metalloids and nonmetals at grain boundaries [8][9][10][11] . In particular, grain boundary segregation of sulfur reduces grain boundary cohesion 12) and decreases ductility 10) .…”

Section: Introductionmentioning

confidence: 99%

Fabricating Bulk Nanocrystalline Ni–W–B Alloys by Electrodeposition

Matsui

Omura

2017

Mater. Trans.

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In this study, we fabricated bulk nanocrystalline Ni-W-B alloys by electrodeposition, using trimethylamine-borane (TMAB) as a boron source, showing how B doping affects tensile properties. In electrodeposition, the TMAB concentration was varied from 0 to 5.0 g/L. Adding TMAB to the deposition bath increased the B content of the electrodeposited alloys up to 0.36 at%, but did not signi cantly change the W content or grain size. Adding more TMAB than 0.1 g/L drastically decreased the material s tensile elongation. Cross-sectional hardness tests on alloys with poor ductility revealed non-uniform hardness and that the initial layer had a high hardness of 6.3-8.7 GPa. This result indicated that the TMAB had immediately decomposed and that the boron decomposition product was mixed into the initial electrodeposited layer. In contrast, the alloys electrodeposited with 0.01-0.05 g/L TMAB showed good tensile elongation of 11%. Our results reveal the appropriate amount of added TMAB in order to produce electrodeposited bulk samples with good ductility.

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Tensile behavior and fracture in nickel and carbon doped nanocrystalline nickel

Cited by 141 publications

References 14 publications

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Nanocrystalline materials and coatings

Fabricating Bulk Nanocrystalline Ni–W–B Alloys by Electrodeposition

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