Serrated deformation of metals and alloys at low temperatures (Review)

Pustovalov, V. V.

doi:10.1063/1.2973710

Cited by 91 publications

(60 citation statements)

References 57 publications

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“…the stress jumps amplitude) of this mode with temperature decrease. The experimental data and the nature of this phenomenon were discussed in [4,5]. Two main hypotheses based on a so-called local heating and dislocation avalanches motion were proposed to explain some of the experimental results obtained for single-and coarse grained crystals.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of Plastic Deformation of SPD Al-Li Alloy at 0.5 K

et al. 2015

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The mechanical properties of AlLi solid solution were studied in tensile deformation tests at extremely low temperature of 0.5 K. The purpose of this study was to investigate the ow stress and work hardening rate as well as the development of serrated (jump-like) deformation for the polycrystalline samples with dierent microstructure. The samples obtained by severe plastic deformation via hydroextrusion were initially tensed up to a given intermediate deformation, then unloaded, annealed to modify their microstructure, and once again deformed to fracture. The increase of the grain size and decrease of average dislocation density due to annealing were found responsible for the work hardening rate increases and the ow stress decrease in accordance with the superposition of the HallPetch and Taylor contributions. As opposed to the ow stress, the high ductility of the samples remains rather insensitive to the microstructure properties, apparently due to suppressed recovery processes as well as the unstable deformation mode at extremely low temperature. The high ductility makes it possible to compare the work hardening rate and the scale of jump-like plastic deformation along the stress-strain curves for samples with dierent microstructures. In all cases, the average amplitude of the stress jumps was observed to increase whereas the average work hardening rate decreases with deformation. The observed correlation indicates that the nature of both phenomenons follows from the dislocation density evolution processes.

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Section: Introductionmentioning

confidence: 99%

Peculiarities of Plastic Deformation of SPD Al-Li Alloy at 0.5 K

et al. 2015

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“…It is more fragile than austenite and its formation leads to some decrease of ε max . The rather comprehensive review of publications about deformation jumps is given in [9]. Since any kind of welding can change the material structure and, therefore, decrease its plasticity, it is much more preferable to perform the tensile tests with cold worked full-size tubes at low temperature.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Tensile tests of ITER TF conductors jacket materials

Anashkin¹,

Кейлин²,

Krivykh³

et al. 2012

AIP Conference Proceedings

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The set of very tough requirements has been formulated for TF jacket materials with extremely high plasticity at liquid helium temperature. The stainless steel 316LN-IG is recommended to be used for TF jacket tubes. Samples of 316LN-IG tubes (whole tubes and sub-size samples) made of the material from the same electro slag remelt have been tested in different conditions -as received tubes and tubes after prescribed compaction, 2.5% deformation at room temperature and heat treatment at 650 0 C, 200 hours. The tensile tests were carried out at room, liquid nitrogen and liquid helium temperatures down to 4.2 K, meeting corresponding ASME and ASTM requirements. The low temperature testing devices are described. The tests results for sub-size samples and whole tubes show that the latter tests are considerably more representative and important for butt weld qualification at LHe temperature. It was observed that the ferromagnetic properties of all samples and especially of butt welds increase with lowering the temperature and increasing the degree of deformation. At LHe temperature a non-uniform and highly localized serrated deformations were observed.

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“…Corollary 7. Finally, the jump-like plastic deformation in solids [24] can be explained with help of the above postulate. Let us rewrite Equation (5) …”

Section: A Postulate Of Plastic Flow Localization and The Ensuing Cormentioning

confidence: 97%

Plastic Flow Macrolocalization: Autowave and Quasi-Particle

Зуев¹,

Баранникова²

2010

JMP

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A new approach is proposed to describe the autowave processes responsible for plastic deformation localization in metals and alloys. The existence of a quasi-particle, which corresponds to a localized plastic flow autowave, is postulated and its characteristics are determined. The above postulate leads to a number of corollaries and quantitative assessments that are considered herein. The deformation processes occurring on the macro-and micro-scale levels are found to be directly related.

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Serrated deformation of metals and alloys at low temperatures (Review)

Cited by 91 publications

References 57 publications

Peculiarities of Plastic Deformation of SPD Al-Li Alloy at 0.5 K

Peculiarities of Plastic Deformation of SPD Al-Li Alloy at 0.5 K

Tensile tests of ITER TF conductors jacket materials

Plastic Flow Macrolocalization: Autowave and Quasi-Particle

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