The dislocation density and twin-boundary frequency determined by X-ray peak profile analysis in cold rolled magnetron-sputter deposited nanotwinned copper

Csiszár, Gábor; Balogh, Levente; Misra, Amit; Zhang, Xinghang; Ungár, Tamás

doi:10.1063/1.3622333

Cited by 23 publications

(15 citation statements)

References 26 publications

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“…The decrease of twin density after a certain amount of deformation strain has been reported earlier. [19][20][21][22][23] A number of factors can be considered as responsible for the decreases of twin density after a certain rolling strain, primary among them being the high dislocation density arrays, which form at very high strain and divide the twin lamellae into equiaxed nano-sized structures. This in turn has been converted to nanometer-sized sub-grains through dynamic recrystallization.…”

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confidence: 99%

Evolution and interaction of twins, dislocations and stacking faults in rolled α-brass during nanostructuring at sub-zero temperature

et al. 2014

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The effect of cryorolling (CR) strain at 153 K on the evolution of structural defects and their interaction in α−brass (Cu–30 wt.% Zn) during nanostructuring has been evaluated. Even though the lattice strain increases up to 2.1 × 10−3 at CR strain of 0.6 initially, but it remains constant upon further rolling. Whereas, the twin density (β) increases to a maximum value of 5.9 × 10−3 at a CR strain of 0.7 and reduces to 1.1 × 10−5 at 0.95. Accumulation of stacking faults (SFs) and lattice disorder at the twin boundaries causes dynamic recrystallization, promotes grain refinement and decreases the twin density by forming subgrains. Detailed investigations on the formation and interaction of defects have been done through resistivity, positron lifetime and Doppler broadening measurements in order to understand the micro-mechanism of nanostructuring at sub-zero temperatures.

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confidence: 99%

Evolution and interaction of twins, dislocations and stacking faults in rolled α-brass during nanostructuring at sub-zero temperature

et al. 2014

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“…26) of nonbasal reflections (in contrast to Refs. 25,27,28) along the cylinder walls of intensity, parallel to the cylinder axis, in reciprocal space, as visualized in Fig. 1(c).…”

Section: B Xrd Evaluationmentioning

confidence: 97%

“…The smallest determined planar-fault density of 6% is already large compared to typical twin densities of nanotwinned materials reported in the literature, e.g., 2-5% for nanotwinned Cu. 25 For higher W contents, abnormally high planar-fault densities of more than 50% were observed, suggesting that on average every second atomic layer can be regarded as a planar fault. Note that for such high planar-fault densities the denotation 'nanotwin' or 'planar fault' is arguable, since the majority of the layers are h layers and an h layer then cannot be considered as a 'fault' anymore.…”

Section: B Degree Of Hexagonalitymentioning

confidence: 97%

“…Such kind of textured polycrystals were also investigated in Ref. 25 by tracing back the very specific diffraction intensity distribution in reciprocal space to a powder-like diffraction pattern using a transmission mode; hence, the advantage of the separation of fault-affected and fault-unaffected reflections is not utilized. To the author's knowledge only Ref.…”

Section: Introductionmentioning

confidence: 99%

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Anomalously high density and thermal stability of nanotwins in Ni(W) thin films: Quantitative analysis by x-ray diffraction

2014

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Magnetron-sputtered Ni(W) films appear to possess a high density of nanotwins oriented parallel to the film surface which highly influences the properties of Ni(W) films. A sophisticated analysis method for describing the stacking sequence of close-packed atomic layers by statistical parameters has been developed which is based on the evaluation of intensity streaks in reciprocal space measured by (x-ray) synchrotron diffraction. In particular, the degree of hexagonality introduced by twinning into these ideally face-centered cubic-stacked films can be quantified. The validity of the proposed analysis has been confirmed by direct observation of the stacking sequences of close-packed layers using (high-resolution) transmission electron microscopy. It has been shown that the degree of hexagonality in the as-deposited state is practically proportional to the W content. Further, the thermal stability of the nanotwins increases with increasing W content which can be understood by the appearance of hexagonal close-packed-like domains exhibiting an intrinsic thermodynamic stability.

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“…The technology has high production efficiency and low cost and requires no cutting or chip production. In the automotive industry, aerospace industry, major strategic equipment industry, and other fields that utilize a spline, gear and screw processing has been widely used [4,5]. In the cold roll-beating forming process, the spline surface performance directly affects the use performance of the spline.…”

Section: Introductionmentioning

confidence: 99%

Surface Performance Multiobjective Decision of a Cold Roll-Beating Spline with the Entropy Weight Ideal Point Method

Cui

Liu

et al. 2018

Mathematical Problems in Engineering

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Surface performance is an important indicator of the performance of cold roll-beating spline processing. To obtain the best cold roll spline surface performance (surface roughness, residual stress, and surface hardening degree), multiobjective optimal process parameters must be determined. To this end, this paper takes the cold roll-beating spline as the object of study and carries out a cold roll-beating spline surface performance test study. An ideal algorithm for entropy weight is constructed, and the multiobjective decision of the cold roll-beating spline surface performance is determined by using the entropy weight ideal point algorithm, providing a decision on the cold roll-beating spline processing parameters. The grey correlation algorithm is used for verification, and the results show that the multiobjective decision of the cold roll-beating spline surface performance is feasible by using the constructed entropy weight ideal point algorithm.

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The dislocation density and twin-boundary frequency determined by X-ray peak profile analysis in cold rolled magnetron-sputter deposited nanotwinned copper

Cited by 23 publications

References 26 publications

Evolution and interaction of twins, dislocations and stacking faults in rolled α-brass during nanostructuring at sub-zero temperature

Evolution and interaction of twins, dislocations and stacking faults in rolled α-brass during nanostructuring at sub-zero temperature

Anomalously high density and thermal stability of nanotwins in Ni(W) thin films: Quantitative analysis by x-ray diffraction

Surface Performance Multiobjective Decision of a Cold Roll-Beating Spline with the Entropy Weight Ideal Point Method

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