Effect of crystallogeometric states on the development of macrobands and deformation inhomogeneity in [111] nickel single crystals

Лычагин, Д. В.; Alfyorova, E. A.; Старенченко, В. А.

doi:10.1016/j.physme.2011.04.009

Cited by 26 publications

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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%

“…In the field of deformation process of Ni and Ni-based single crystal, lots of Refs. [19][20][21][22] are focus on Ni-based super-alloy single crystal, but researches [9,23,24] about FCC Ni single crystal are relatively less. Owing to the completely different crystal structures, the deformation mechanism of FCC Ni single crystal is greatly different from that of Ni-based super-alloy single crystal, and the dynamic deformation mechanism of FCC Ni single crystal still lacks a systematically study.…”

Section: Introductionmentioning

confidence: 99%

“…In previous works about the deformation mechanisms of FCC Ni single crystals, attention has been directed towards the quasi-static deformation. In this field, Lychagin et al [9] investigated the regularities of macro-and mecoscale deformation of ½ 111 nickel single crystals with different shapes, and then determined the strain localization factors. According to his research, the regions of deformation macrobands and folds are not localized in the area having the most of strain, and the deformation of specimen is inhomogeneous.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dislocation Slip Behavior of Ni Single Crystal Under Dynamic Compression

Luo

Liu

Guo

et al. 2016

J. dynamic behavior mater.

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“…In earlier studies, the authors have repeatedly pointed to the quasi-periodic surface profile of single crystals after plastic deformation and on the periodicity of distribution of the deformation values (including alternation of local places of tension and compression) [5][6]. Moreover a distinctive morphology characteristic of structural elements of different types of strain relief was described.…”

Section: Introductionmentioning

confidence: 95%

The formation of a quasi-periodic surface profile by means of dislocation slip

Alfyorova

Лычагин

Soprunov

2017

J. Phys.: Conf. Ser.

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Abstract. This work presents the experimental results concerning the research of the morphology of the face-centered cubic (FCC) single crystals surface after compression deformation. Our aim is to identify the method of forming a quasiperiodic profile of single crystals with different crystal geometrical orientation. A set of modern methods as optical and confocal microscopy is applied. It is done to determine the morphology of surface parameters. The results show that the octahedral slip is an integral part of the formation of quasiperiodic profile surface and is starting with the initial strain. We present values of shear quantity directly in shear traces, meso-and macrobands and in shear tracks shift within them. The similarity of the process of surface profile forming at different levels of scale is given. Finally, we suppose that octahedral slip is the main way to form quasiperiodic deformation relief. We compare our results to published data and identify common regularities for various metal FCC single crystals with different deformation methods. The experimental results presented can be used for mathematical modeling of plastic deformation. IntroductionChanges in topology of solid surface after deformation are of interest to researchers from various branches of science for many years. The experimental data and results of mathematical models indicate that folding, wrinkling, extrusion and intrusion, checkerboard distribution regions, etc. are frequent and appear in a variety of load conditions. This process is typical for the poly-and single crystals, the folds can be observed in geology and metal forming. Folding being manifested in different ways of deformation, it has various manifestations and can be initiated as a slip and twinning.The results of finite element modeling of the emergence of roughness during plastic deformation of polycrystalline aluminum are given in article [1]. Results showed that texture samples and the direction of strain influence the formation of roughness. There are "ribbed ridging profiles" and the surface of the "orange peel shape". The paper also indicates that the Taylor factor affects the type of roughness. Article [2] represents the experimental data which show that the size and orientation of the grain influence roughness during plastic deformation. The results were obtained by the example of polycrystalline aluminum alloys. In all cases, there is a quasi-periodic surface profile after the deformation.The series of works by Gubernatorov V.V. with colleagues had called the reason for corrugating surface distortion of the material layers. They also show that the corrugation may be formed in a structurally homogeneous material (single crystal), that is, availability of basic stress concentrators is

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“…д.) [9], так и применяться дополнительные методы (метод корреляции цифровых изображений [14], метод делительных сеток [16] и др. ), которые по изме-нению рельефа идентифицируют места неоднородного протекания деформации.…”

Section: Introductionunclassified

Deformation relief in crystals as a way of stress relaxation

Alfyorova¹,

Лычагин²

2017

LoM

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The formation of a deformation relief of crystals is considered as a way of relaxation of an applied stress. The process of selforganization of slip bands into structural elements of the deformation relief of a qualitatively new level (packs of slip bands, meso-and macrobands) is directed to reduce local stresses in the zone of their formation as compared to those in the region occupied by slip bands. It is established that the formation of a quasiperiodic deformation relief occurs under the conditions of Azaro-Tiller-Greenfield instability and critical wavelengths of the surface perturbations are calculated. Each type of structural elements of the deformation relief causes a certain local curvature of the surface and increases the magnitude of the local stress in the region of its formation. On an example of nickel monocrystals it is revealed that the maximum stress concentration on the surface of 8.2 times is caused by packed slip bands, macrobands cause a 6.3 times increase of the local stress and the minimum concentration value of 3.3 is typical for mesobands. Сurvature radii of the convex zones are the largest for macrobands (r = 0.40 ± 0.04 μm) that facilitates the stress relaxation, while for mesobands it is the smallest (r = 0.050 ± 0.003 μm). It is shown that the process of self-organization of the deformation relief increases the size of a region with compatible strains that results in a longer preservation of the crystal integrity during deformation. On examples of f.c.c. single crystals of nickel, aluminum, ordered and disordered Ni 3 Fe alloy it is shown that the self-organization of slip bands into packs reduces the local stress in the packs formation zone by 1.8 to 3.5 times in comparison with slip bands. The revealed regularities are characteristic for materials with different stacking fault energies, types of sliding dislocations, and crystallographic features. В настоящей работе формирование деформационного рельефа кристалла рассматривается как способ релакса-ции приложенного напряжения. Показано, что процесс самоорганизации следов сдвига в структурные элементы деформационного рельефа качественно нового уровня (пачки следов, мезо-и макрополосы) направлен на сниже-ние локальных напряжений в зоне их формирования по сравнению с областью, занятой следами сдвига. Установ-лено, что формирование квазипериодического деформационного рельефа происходит в условиях нестабильности Азаро-Тиллера-Гринфельда, рассчитаны критические длины волны возмущений поверхности λ c для пачек следов, мезо-и макрополос. Показано, что каждый тип структурных элементов деформационного рельефа вызывает опре-деленную локальную кривизну поверхности и повышает величину локального напряжения в месте своего фор-мирования. На примере монокристаллов никеля выявлено, что максимальное повышение напряжения в 8.2 раза в месте выхода на поверхности создают следы сдвига, макрополосы повышают локальное напряжение в 6.3 раз, а минимальное значение характерно для мезополос (в 3.3 раза). Радиус кривизны в зоне выпуклости для макрополос самый бо...

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Effect of crystallogeometric states on the development of macrobands and deformation inhomogeneity in [111] nickel single crystals

Cited by 26 publications

References 0 publications

Dislocation Slip Behavior of Ni Single Crystal Under Dynamic Compression

Dislocation Slip Behavior of Ni Single Crystal Under Dynamic Compression

The formation of a quasi-periodic surface profile by means of dislocation slip

Deformation relief in crystals as a way of stress relaxation

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