High strength, ductility, and electrical conductivity of in-situ consolidated nanocrystalline Cu-1%Nb

Youssef, Khaled M.; Abaza, Mohamed A.; Scattergood, R.O.; Koch, Carl C.

doi:10.1016/j.msea.2017.11.060

Cited by 31 publications

(9 citation statements)

References 44 publications

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“…Nb: Addition of 1at.% Nb to Cu greatly affects its mechanical properties and deformation mechanism. The ultra-high yield and ultimate tensile strengthsare achieved simultaneously with good ductility and strain hardening of the NC Cu-1at.% Nb than that of the NC Cu have been observed [7]. These improved properties are the effect of smaller grain size (it has been found that Nb atoms stabilize effectively grain size in Cu [82,83]), solid solution hardening, andlattice stresses associated with supersaturation of Nb in Cu matrix.GSFE shows thatall energies decrease then in Cu and SFE/USFE is lowered by Nb as well.…”

Section: Stacking Fault Energies In Copper In 4d Transition Metal Alloysmentioning

confidence: 81%

“…Copper and Cu based alloys are widely investigated due to high strength and high electrical and thermal conductivity [1][2][3][4][5][6][7][8][9]. High strength of copper alloys might be caused by nanoscale precipitates [10], deformation twining [11,12], and/or solid solutions strengthening [13].…”

Section: Introductionmentioning

confidence: 99%

“…Recently,an effort has been made to measure the influence of deformation twins on the mechanical behaviour of Cu [14] and Cu-based alloys: i.e. Cu-Al [15][16][17], Cu-Ag [1,18], Cu-Cr [19,20], Cu-Nb [7], Cu-Ta [21], Cu-Zn [22], Cu-Zr [23]. The evolution of nanotwinned copper leads to the high strength of materials [11,14].…”

Section: Introductionmentioning

confidence: 99%

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Generalised stacking fault energies of copper alloys - density functional theory calculations

Muzyk

Kurzydłowski

2019

J min metall B Metall

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Generalised stacking fault energies of copper alloys have been calculated using density functional theory. Stacking fault energy of copper alloys is correlated with the d-electrons number of transition metal alloying element. The tendency to twiningis also modified by the presence of alloying element in the deformation plane. The results suggest that Cu-transition metal alloys with such elements as Cr, Mo, W, Mn, Re are expected to exhibit great work hardening rate due to the tendency to emission of the partial dislocations.

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Section: Stacking Fault Energies In Copper In 4d Transition Metal Alloysmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Generalised stacking fault energies of copper alloys - density functional theory calculations

Muzyk

Kurzydłowski

2019

J min metall B Metall

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“…Both strategies open up novel opportunities for the design of advanced materials with tailored properties. They typically offer higher strength [1][2][3], hardness [3], toughness [4,5] and ductility [6,7] than both their individual single-phase components and coarse-grained counterparts. In case of heterogeneous systems, these superior properties are the consequence of joining substructures of either different grain sizes [8], crystal structures [9], or atomic compositions [10].…”

Section: Introductionmentioning

confidence: 99%

Breakdown of the superplastic deformation behavior of heterogeneous nanomaterials at small length scales

Feldner

Merle

Göken

2020

Materials Research Letters

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Ultrafine-grained and nanocrystalline materials frequently show an enhanced rate sensitivity of their mechanical behavior, which is generally assumed to be the consequence of interface sliding or thermally activated dislocation processes at the boundaries. Although this has been well documented on many different materials, the underlying mechanisms and their effect on the ductility of the material are still not well understood. Therefore, here, the deformation behavior of the ultrafinegrained, heterogeneous superplastic alloy Zn-22% Al was analyzed by small-scale nanoindentation and micropillar testing. The results show a breakdown of the superplastic deformation behavior in terms of a reduced strain rate sensitivity at small scales, which has not been reported before, although grain boundary sliding is still prevalent at the nanoscale. These results suggest that grain boundary sliding does not necessarily result in a high strain rate sensitivity and high ductility. Instead, a pronounced strain rate dependent flow behavior requires grain boundary sliding to be controlled by dislocation creep. IMPACT STATEMENTSuperplastic flow is shown to persist down to a small material volume corresponding to a few grains. This has far-reaching consequences for the production of small-scale devices with complex geometries by superplastic forming.

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“…Nanoscale materials having a grain size in the range of few nanometers (<100 nm) are of prime scientific interest because of their unique structural properties, making them a potential contender for advanced functional applications . However, intensive exploitation of these potential applications in different scientific and industrial sectors requires large‐scale as well as economical processing of such nanoscale materials with precise resolution.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Probing of Structural Evolution of Single Crystal Fe during Rolling Process Using Atomistic Simulation

Reddy

Pal

2019

steel research int.

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Rolling process is known to have significant influence on the structural properties of nanomaterials. However, the atomistic mechanism of the deformation behavior during rolling process is still unclear. Here, for the first time, MD simulations are implemented to study the deformation mechanism and structural evolution in single crystal Fe during cryo-and cold-rolling. The results show that new grains are formed in the specimen with {001}<100> and {011}<011> orientation through grain rotation, whereas the plastic strain is accumulated through lattice distortion in specimen having {011}<111> orientation. The phenomenon of grain rotation and lattice distortion is also confirmed through Virtual X-ray diffraction method. Also, structural evolution analysis has shown BCC to FCC phase transformation in specimen with {001}<100> orientation and it is found that the two phases have Bains' orientation relationship. Figure 4. Atomic snapshot during the cryo-rolling (77 K temperature) process illustrating dislocation generation and grain rotation for specimen with {001}<100> orientation. Inset in (e) shows formation of Σ5 kite grain boundary structure.www.advancedsciencenews.com www.steel-research.de steel research int. 2019, 90, 1800636

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High strength, ductility, and electrical conductivity of in-situ consolidated nanocrystalline Cu-1%Nb

Cited by 31 publications

References 44 publications

Generalised stacking fault energies of copper alloys - density functional theory calculations

Generalised stacking fault energies of copper alloys - density functional theory calculations

Breakdown of the superplastic deformation behavior of heterogeneous nanomaterials at small length scales

Dynamic Probing of Structural Evolution of Single Crystal Fe during Rolling Process Using Atomistic Simulation

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