Macrosegmentation and strain hardening stages in copper single crystals under compression

Лычагин, Д. В.; Tarasov, S. Yu.; Чумаевский, А. В.; Alfyorova, E. A.

doi:10.1016/j.ijplas.2015.01.007

Cited by 37 publications

(7 citation statements)

References 45 publications

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“…In addition to thin and rectilinear slip bands, there are morphology elements that are more typical for higher strain levels. These elements may be characterized as a series of coarse distorted slip bands that form an overthrust zone morphologically similar to fold [46,47] or corrugated structures (Figure 12a).…”

Section: Deformation Surface Morphologymentioning

confidence: 99%

“…Bent slip bands can be also seen on the background of single or double slip system bands as viewed along the direction close to that of a normal. Such an overthrust region formed in the direction perpendicular to that of a load is typical for FCC single crystals under uniaxial compression test when a compression axis is chosen to be parallel to crystallographic axis <111> [46,51].…”

Section: Deformation Surface Morphologymentioning

confidence: 99%

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Strength and Ductility Improvement through Thermomechanical Treatment of Wire-Feed Electron Beam Additive Manufactured Low Stacking Fault Energy (SFE) Aluminum Bronze

Khoroshko

Filippov

Tarasov

et al. 2020

Metals

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An as-cast macrostructure of electron beam additively manufactured metallic materials was represented by coarse columnar grains whose axes were inclined at 25° with respect to the substrate’s plane. One part of the as-grown samples was annealed to form a coarse grain microstructure while the other part was pre-deformed by forging and then annealed what allowed obtaining recrystallized microstructures with small grains and multiple annealing twin boundaries. This sample showed both high strength and plasticity during the tensile tests. These tensile tests demonstrated also two-stage stress-strain curves as depended on their strain hardening rates. High and low strain hardening rates corresponded to a twinning-dominated deformation at stage II and dislocation-base deformation at stage III. A submicron size strain-induced grain-subgrain microstructure was formed in the vicinity of a necked zone as a result of combined twinning/dislocation grain refining.

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Section: Deformation Surface Morphologymentioning

confidence: 99%

Section: Deformation Surface Morphologymentioning

confidence: 99%

Strength and Ductility Improvement through Thermomechanical Treatment of Wire-Feed Electron Beam Additive Manufactured Low Stacking Fault Energy (SFE) Aluminum Bronze

Khoroshko

Filippov

Tarasov

et al. 2020

Metals

Self Cite

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“…To date, extensive research papers about the quasi-static deformation behaviors and mechanisms of single crystals such as Ag [1], Cu [1][2][3], Nb [4,5], Mo [6], Mg [7], Ti [8], Ni [9] and others [10] have been reported. Among these reports, a relatively clearer understanding of deformation mechanisms of single crystals under quasi-static loading condition has been obtained, and in-depth studies were carried out on the deformation inhomogeneity, microtexture development, strain hardening together with the formation and development of bands.…”

Section: Introductionmentioning

confidence: 99%

Dislocation Slip Behavior of Ni Single Crystal Under Dynamic Compression

Luo

Liu

Guo

et al. 2016

J. dynamic behavior mater.

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Face-centered-cubic Ni single crystal was compressed along [011] direction at a strain rate of 10 3 s -1 , and microscopic characterization of slip bands was analyzed to investigate dynamical deformation mechanism of the Ni single crystal. By analyzing Schmid Factor and orientation of slip bands, the specific slip planes were revealed. Furthermore, by analysis of Schmid Factors and dimensions of the deformed sample, the slip directions are revealed, and the ratio of the slipping-induced displacement (D-ratio) related to each slip system were determined. . Moreover, the quasi-static compression experimental results show the same slip systems, and the calculated slipping-induced displacement related to above 4 slip system have a ratio of nearly 1:3.8:3.8:1 under quasi-static compression. Thus, in a considerable strain rate range from 10 -3 to 10 3 s -1 , the activated slip systems and the ratio of their corresponding slipping-induced displacement are the same. However, experimental results show that, the slip bands on side surface of Ni single crystal subjected to dynamic compression is denser than that of the quasi-static compressed sample, indicating that the slip bands are formed more easily under dynamic loading condition.

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“…This leads to the decomposition of the single crystal volume into deformation domains. The difference in deformation of the domains determines the deformation non-uniformity of the sample [15,[43][44][45].…”

Section: Deformation Reliefmentioning

confidence: 99%

Numerical Study and Experimental Validation of Deformation of <111> FCC CuAl Single Crystal Obtained by Additive Manufacturing

Nikonov

Дмитриев

Лычагин

et al. 2021

Metals

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The importance of taking into account directional solidification of grains formed during 3D printing is determined by a substantial influence of their crystallographic orientation on the mechanical properties of a loaded material. This issue is studied in the present study using molecular dynamics simulations. The compression of an FCC single crystal of aluminum bronze was performed along the <111> axis. A Ni single crystal, which is characterized by higher stacking fault energy (SFE) than aluminum bronze, was also considered. It was found that the first dislocations started to move earlier in the material with lower SFE, in which the slip of two Shockley partials was observed. In the case of the material with higher SFE, the slip of a full dislocation occurred via successive splitting of its segments into partial dislocations. Regardless of the SFE value, the deformation was primarily occurred by means of the formation of dislocation complexes involved stair-rod dislocations and partial dislocations on adjacent slip planes. Hardening and softening segments of the calculated stress–strain curve were shown to correspond to the periods of hindering of dislocations at dislocation pileups and dislocation movement between them. The simulation results well agree with the experimental findings.

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Macrosegmentation and strain hardening stages in copper single crystals under compression

Cited by 37 publications

References 45 publications

Strength and Ductility Improvement through Thermomechanical Treatment of Wire-Feed Electron Beam Additive Manufactured Low Stacking Fault Energy (SFE) Aluminum Bronze

Strength and Ductility Improvement through Thermomechanical Treatment of Wire-Feed Electron Beam Additive Manufactured Low Stacking Fault Energy (SFE) Aluminum Bronze

Dislocation Slip Behavior of Ni Single Crystal Under Dynamic Compression

Numerical Study and Experimental Validation of Deformation of <111> FCC CuAl Single Crystal Obtained by Additive Manufacturing

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