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Artykuły w czasopismach na temat „Plastic deformation in metals”

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Data publikacji: 6 września 2023

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1

VERLINDEN, BERT. "Severe plastic deformation of metals". Metalurgija-Journal of Metallurgy 11, nr 3 (30.09.2005): 165–82. http://dx.doi.org/10.30544/380.

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This paper provides an introduction in the field of severe plastic deformation (SPD). First of all the main methods to produce SPD materials are discussed. In the following section, the mechanisms leading to the formation of fine grains are reviewed and the influence of changes in strain path is highlighted. During post-SPD thermal annealing, some typical microstructural changes take place. The influence of SPD and subsequent annealing on strength, ductility and superplastic properties are reviewed. Finally the paper provides a short overview of fatigue resistance and corrosion properties of those materials.

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2

Kim, L., J. Hofler, A. Daykin, Robert S. Averback i Carl Altstetter. "Plastic Deformation of Nanophase Metals". Materials Science Forum 189-190 (lipiec 1995): 367–72. http://dx.doi.org/10.4028/www.scientific.net/msf.189-190.367.

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3

Weertman, J. R., i P. G. Sanders. "Plastic Deformation of Nanocrystalline Metals". Solid State Phenomena 35-36 (wrzesień 1993): 249–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.35-36.249.

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4

Ghoshi, S. K. "The plastic deformation of metals". Journal of Mechanical Working Technology 12, nr 3 (luty 1986): 388. http://dx.doi.org/10.1016/0378-3804(86)90011-2.

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5

Kiv, Arnold, Arkady Bryukhanov, Vladimir Soloviev, Andrii Bielinskyi, Taras Kavetskyy, Dmytro Dyachok, Ivan Donchev i Viktor Lukashin. "Complex Network Methods for Plastic Deformation Dynamics in Metals". Dynamics 3, nr 1 (30.01.2023): 34–59. http://dx.doi.org/10.3390/dynamics3010004.

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Plastic deformation of DC04 steel is regarded as a nonlinear, complex, irreversible, and self-organized process. The stress–strain time series analysis provided the possibility to identify areas of (quasi-)elastic deformation, plastic deformation, and necking. The latter two regions are the most informative. The area of inelastic deformation is reflected by collective, self-organized processes that lead to the formation of pores, and finally, the development of microcracks and a general crack as the cause of sample failure. Network measures for the quantitative assessment of the structural deformations in metals are proposed. Both spectral and topological measures of network complexity were found to be especially informative. According to our results, they can be used not only to classify the stages of plastic deformation, but also, they can be applied as a precursor of the material destruction process.

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6

Kvačkaj, Tibor, i Jana Bidulská. "From Micro to Nano Scale Structure by Plastic Deformations". Materials Science Forum 783-786 (maj 2014): 842–47. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.842.

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Nowadays, the strategy for improving of mechanical properties in metals is not oriented to alloying followed by heat treatment. An effective way how to improve the mechanical properties of metals is focused on the research looking for some additional structural abilities of steels. Structural refinement is one of the ways. Refinement of the austenitic grain size (AGS) carried out through plastic deformation in a spontaneous recrystallization region of austenite, formation of AGS by plastic deformations in a non-recrystallized region of austenite will be considered as potential ways for AGS refinement. After classic methods of plastic deformations, next structure refinement can be obtained by an application of severe plastic deformation (SPD) methods.

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7

Zhang, Chao. "Research on Metal Elastic - Plastic Deformation". International Journal of Innovative Research in Engineering & Management 3, nr 6 (17.11.2016): 474–76. http://dx.doi.org/10.21276/ijirem.2016.3.6.4.

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8

Rosochowski, Andrzej. "Processing Metals by Severe Plastic Deformation". Solid State Phenomena 101-102 (styczeń 2005): 13–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.101-102.13.

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Severe plastic deformation (SPD) is used to convert traditional coarse grain metals and alloys into ultrafine-grained (UFG) materials. UFG materials possess a number of improved mechanical and physical properties which destine them for a wide commercial use. However, any attempt to use SPD technology commercially requires a better insight into the mechanics and practicality of SPD processes. This paper looks into historical development of SPD processes and focuses on such aspects of SPD as material flow, role of hydrostatic pressure, friction, geometry of tools, billet and feeding considerations, technical feasibility, etc. The discussion of these topics sets a background for decisions concerning further research and commercialisation of SPD.

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9

Alden, Thomas H. "Plastic and viscous deformation of metals". Metallurgical Transactions A 16, nr 3 (marzec 1985): 375–92. http://dx.doi.org/10.1007/bf02814336.

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10

Cabibbo, Marcello, i Eleonora Santecchia. "Early Stages of Plastic Deformation in Low and High SFE Pure Metals". Metals 10, nr 6 (5.06.2020): 751. http://dx.doi.org/10.3390/met10060751.

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Severe plastic deformation (SPD) techniques are known to promote exceptional mechanical properties due to their ability to induce significant grain and cell size refinement. Cell and grain refinement are driven by continuous newly introduced dislocations and their evolution can be followed at the earliest stages of plastic deformation. Pure metals are the most appropriate to study the early deformation processes as they can only strengthen by dislocation rearrangement and cell-to-grain evolution. However, pure metals harden also depend on texture evolution and on the metal stacking fault energy (SFE). Low SFE metals (i.e., copper) strengthen by plastic deformation not only by dislocation rearrangements but also by twinning formation within the grains. While, high SFE metals, (i.e., aluminium) strengthen predominantly by dislocation accumulation and rearrangement with plastic strain. Thence, in the present study, the early stages of plastic deformation were characterized by transmission electron microscopy on pure low SFE Oxygen-Free High Conductivity (OFHC) 99.99% pure Cu and on a high SFE 6N-Al. To induce an almost continuous rise from very-low to low plastic deformation, the two pure metals were subjected to high-pressure torsion (HPT). The resulting strengthening mechanisms were modelled by microstructure quantitative analyses carried out on TEM and then validated through nanoindentation measurements.

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11

Zuev, L. B. "Macroscopic Physics of Plastic Deformation of Metals". Uspehi Fiziki Metallov 16, nr 1 (1.03.2015): 35–60. http://dx.doi.org/10.15407/ufm.16.01.035.

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12

Paidar, Vaclav, i Jaroslav Čapek. "Anisotropy of Plastic Deformation in Hexagonal Metals". Materials Science Forum 1016 (styczeń 2021): 1091–96. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1091.

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Geometric aspects of the shear processes in hexagonal metals are analysed. They can be divided into three groups: those localized essentially between neighbouring atomic planes, occurring in narrow slabs along particular atomic planes, or covering a large crystal volume. Obviously, dislocation glide and deformation twinning are principal types of such processes. On the geometrical level, the dislocation slip as well as twin propagation are controlled by Schmid factors. Since the sample loaded by external stress can sometimes give way to fracture (cleavage) under tensile stress, it has to be also mentioned. The main aim of this work is to show only on geometrical grounds for which sample orientation which process is more likely to occur. More complex shear processes that take place during double twinning are also briefly considered. In polycrystals, the shear phenomena lead to texture formation when the processes that control the behaviour of materials may be those that act in a similar way in single crystals.

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13

HAKAMADA, Masataka. "Plastic Deformation of Micro- and Nanoporous Metals". Journal of the Japan Society for Technology of Plasticity 52, nr 611 (2011): 1306–7. http://dx.doi.org/10.9773/sosei.52.1306.

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14

Pan, Wen‐Fung, i Han C. Wu. "Finite plastic deformation for metals under torsion". Journal of the Chinese Institute of Engineers 14, nr 6 (wrzesień 1991): 611–18. http://dx.doi.org/10.1080/02533839.1991.9677377.

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15

Van Swygenhoven, H., M. Spaczer, A. Caro i D. Farkas. "Competing plastic deformation mechanisms in nanophase metals". Physical Review B 60, nr 1 (1.07.1999): 22–25. http://dx.doi.org/10.1103/physrevb.60.22.

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16

Toth, Laszlo S., i Chengfan Gu. "Ultrafine-grain metals by severe plastic deformation". Materials Characterization 92 (czerwiec 2014): 1–14. http://dx.doi.org/10.1016/j.matchar.2014.02.003.

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17

Van Swygenhoven, H. "Footprints of plastic deformation in nanocrystalline metals". Materials Science and Engineering: A 483-484 (czerwiec 2008): 33–39. http://dx.doi.org/10.1016/j.msea.2006.10.204.

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18

Shichun, Wu, Liang Hua i Li Miaoquan. "Microvoid growth in metals during plastic deformation". Journal of Materials Processing Technology 32, nr 3 (sierpień 1992): 627–31. http://dx.doi.org/10.1016/0924-0136(92)90258-t.

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19

Gul'Bin, V. N., i A. G. Kobelev. "Plastic deformation of metals in explosion welding". Welding International 13, nr 4 (styczeń 1999): 306–9. http://dx.doi.org/10.1080/09507119909447385.

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20

Azushima, A., R. Kopp, A. Korhonen, D. Y. Yang, F. Micari, G. D. Lahoti, P. Groche i in. "Severe plastic deformation (SPD) processes for metals". CIRP Annals 57, nr 2 (2008): 716–35. http://dx.doi.org/10.1016/j.cirp.2008.09.005.

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21

Sivak, Roman, i Volodymyr Rekechynsky. "FEATURES OF PLASTIC DEFORMATION OF METALS IN NON-MONITORING DEFORMATION". Vibrations in engineering and technology, nr 2(93) (31.05.2019): 50–55. http://dx.doi.org/10.37128/2306-8744-2019-2-8.

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In this paper we consider two-legged trajectories in the space of the deformation vector. Trajectories were obtained in tensile experiments with subsequent torsion and tensile experiments with subsequent joint tension and stretching of standard solid cylindrical samples from steel 10. Deformation was carried out according to programs that ensure the linearity of trajectories in the deformation space. The components of the stress deviator were determined using an anisotropically strengthened body model. In this experiment, a function characterizing the Bauschinger effect and a function characterizing the hereditary influence of the load history on the current state of the metal during plastic deformation was experimentally determined. It is shown that in the case of nonmonotonic loading, which is characterized by trajectories of large curvature, it is necessary to use O. A. Ilyushin's theory of plasticity, and the model G. Bachhaus yields satisfactory results only for trajectories of medium and low curvature. In general, the suitability of a particular plasticity theory needs to be verified experimentally.

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22

Khriplivets, I. A. "The influence of rolling and high-pressure torsion in the Bridgman chamber on the quantitative characteristics of shear bands in an amorphous Zr-based alloy". Vektor nauki Tol'yattinskogo gosudarstvennogo universiteta, nr 2 (2021): 67–74. http://dx.doi.org/10.18323/2073-5073-2021-2-67-74.

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Amorphous alloys based on metal components demonstrate a unique ability to realize plastic deformation under the influence of external mechanical stresses. Influenced by substantial degrees of plastic deformation in alloys, one can observe shear bands (SB) in the form of rough lines on the polished surface of the sample. The concept of shear band formation in amorphous metallic glasses varies greatly from plastic deformation processes in crystalline metals and alloys. Unlike crystalline metals, amorphous metallic glasses can exist in a spectrum of structural states with accompanying mechanical, thermodynamic, and physical properties of materials. The formation and evolution of shear bands control the fluidity and plasticity of almost all metallic glasses at room temperature, and in many cases, the formation of dominant shear bands rapidly leads to failure. The literature does not contain any rigorous quantitative description of SB main parameters, which could adequately describe in the analytical form the process of plastic deformation of amorphous alloys, similar to the dislocation and disclination theories of plastic deformation of crystals. An open question remains how the transition from macroscopic deformation to severe plastic deformations of amorphous alloys affects the key SB characteristics. In this work, using the method of optical profilometry, the author studied in detail the quantitative characteristics of the steps formed by shear bands on the surface of deformed samples of the massive amorphous alloy Zr60Ti2Nb2Cu18.5Ni7.5Al10 after high-pressure torsion (HPT) and after rolling. The study identified that the design of shear bands depends on the deformation method and showed that the magnitude of deformation had the controlling effect on the shear bands thickness (the height of the steps). The transition from deformation by rolling (e=0.4) to plastic deformation during HPT (e=2.6) leads to the threefold increase in the power of shear bands and the average distance between them.

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23

Dragobetskii, Volodymyr, Mykhaylo Zagirnyak, Olena Naumova, Sergii Shlyk i Aleksandr Shapoval. "Method of Determination of Technological Durabilityof Plastically Deformed Sheet Parts of Vehicles". International Journal of Engineering & Technology 7, nr 4.3 (15.09.2018): 92. http://dx.doi.org/10.14419/ijet.v7i4.3.19558.

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The purpose of the article is to develop an apparatus providing maximum or predicted durability of parts treated during their manufacture by plastic deformation. In these terms, the parameters of the technological process should provide the maximum or expected increase of the endurance limit in comparison with the initial parts values before the strengthening by the surface plastic deformation or after plastic forming. The article describes the influence of the degree of preliminary deformation on the kinetics of fatigue failure of metals and alloys. Experimental data of the ultimate deformations of welded workpieces were obtained, which make it possible to evaluate the manufacturing of parts with a weld seam at the design stage of the technological process. The developed method made it possible to determine the nonstationary field of stresses in the deformation region, ultimate deformations and the most rational scheme of the stress-strain state, which excludes the localization of deformations and destruction of the weld zone of a welded cylindrical workpieces.

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24

Lowe, Terry C. "Outlook for Manufacturing Materials by Severe Plastic Deformation". Materials Science Forum 503-504 (styczeń 2006): 355–62. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.355.

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Six years have passed since the international workshop “Investigations and Applications of Severe Plastic Deformation” held 2-8 August 1999 in Moscow, Russia. This workshop focused on severe plastic deformation (SPD) processing to produce bulk nanostructured metals and alloys. Since 1999 the field has expanded from 200 to over 2000 publications that have addressed the microstructures and properties that can be produced by a growing number of SPD techniques. In view of this expansion, the outlook for ongoing development of severely deformed materials is updated. Special attention is given to factors influencing the manufacturing and commercialization of SPD-processed metals, including barriers to their widespread application. Recommendations are made for future SPD research that will facilitate more rapid commercialization of SPD-processed metals and enhance the competitiveness of SPD processing with respect to alternative technologies for producing bulk nanostructured metals.

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25

Tsuru, Tomohito, Yoshiteru Aoyagi, Yoshiyuki Kaji i Tomotsugu Shimokawa. "ICONE23-1582 Atomistic simulation of yield and plastic deformation in bulk nanostructured metals". Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_273.

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26

Ramulu, M., S. Kunaporn, D. Arola, M. Hashish i J. Hopkins. "Waterjet Machining and Peening of Metals". Journal of Pressure Vessel Technology 122, nr 1 (31.08.1999): 90–95. http://dx.doi.org/10.1115/1.556155.

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An experimental study was conducted to determine the influence of high-pressure waterjet (WJ) peening and abrasive waterjet (AWJ) machining on the surface integrity and texture of metals. A combination of microstructure analysis, microhardness measurements, and profilometry were used in determining the depth of plastic deformation and surface texture that result from the material removal process. The measurement and evaluation of residual stress was conducted with X-ray diffraction. The residual stress fields resulting from treatment were analyzed to further distinguish the influence of material properties on the surface integrity. It was found that waterjet peening induces plastic deformation at the surface layer of metals as good as shot peening. The degree of plastic deformation and the state of material surface were found to be strongly dependent on the peening conditions applied. [S0094-9930(00)00801-5]

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27

Shaparev, A. V., i I. A. Savin. "Calculation of Joint Plastic Deformation to Form Metal Compound in Cold Condition". Solid State Phenomena 265 (wrzesień 2017): 313–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.313.

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The author of the paper proposed a model of joint plastic deformation of two metals in cold state. That model is based on a well-known "oxide" hypothesis. It was demonstrated experimentally that steel/ brass close contact occurs as early as at the degree of deformation 0.15–0.20, but this level of deformation is insufficient to form a compound. A close contact of metals is a necessary but insufficient condition for compounding metals in cold state. The sufficient condition for two metals compounding is the degree of deformation more than 0.50. At this deformation level juvenile metal surfaces begin entering into contact by forming adhesion bridges.

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28

Khon, Yu A., i L. B. Zuev. "Relaxation mode of macroscopic plastic deformation in metals". Izvestiya vysshikh uchebnykh zavedenii. Fizika, nr 9 (2020): 86–88. http://dx.doi.org/10.17223/00213411/63/9/86.

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The relaxation of elastic energy during macroscopic plastic deformation in a strict formulation is determined by the solutions of the system of nonlinear equations of mechanics of a deformable solid. Using the methods of the theory of nonlinear systems, a nonlinear parabolic equation is obtained for the amplitude of an unstable mode, which describes plastic deformation at large spatial and temporal scales.

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29

Kolobov, Yu R., i Konstantin Ivanov. "Grain Boundary Diffusion-Controlled Processes and Properties of Bulk Nanostructured Alloys and Steels". Materials Science Forum 503-504 (styczeń 2006): 141–48. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.141.

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The experimental and theoretical investigations of grain boundary diffusion processes have been performed using metals and alloys in nanostructured state produced by severe plastic deformation and the respective polycrystalline counterparts. The main features of diffusioncontrolled mechanisms of plastic deformation observed by the creep of nanostructured metals are considered. The use of severe plastic deformation treatment and of the effect of activation of diffusion-controlled processes for enhancing the properties of nanostructured steels and alloys designed for engineering and medical applications (nanostructured titanium-bioactive coating composite included) is described and examples are offered.

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30

Gertsriken, D. S. "Effect of an Impulse Loading on Localization of Diffusing Atoms in Metals". Defect and Diffusion Forum 277 (kwiecień 2008): 91–97. http://dx.doi.org/10.4028/www.scientific.net/ddf.277.91.

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Distribution and mobility of own and impurity atoms in metals subjected to different loadings: quasi-static plastic strains; quasi-static deformations in combination with impulse; sluggish and fast elastic deformations, including alternating, impulse plastic strains are investigated by methods of an autoradiography, layer-by-layer radiometric analysis and secondary ionic mass spectrometry. The common regularities of migration of atoms at deformation of metals are found, and threshold values of a strain rate, corresponding to change of the diffusion mechanism and localization of penetrating atoms in metal, are determined. The conclusion about the bulk mechanism of substance transfer is made at pulse actions irrespective of temperature of processing.

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31

Khon, Yu A., i L. B. Zuev. "Relaxation Mode of Macroscopic Plastic Deformation in Metals". Russian Physics Journal 63, nr 9 (styczeń 2021): 1545–47. http://dx.doi.org/10.1007/s11182-021-02204-w.

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32

Kowalewski, Zbigniew L. "Creep of Metals Subjected to Prior Plastic Deformation". Key Engineering Materials 274-276 (październik 2004): 913–18. http://dx.doi.org/10.4028/www.scientific.net/kem.274-276.913.

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SUZUKI, Shinsuke, Juan LOBOS MARTIN, Hiroshi USTUNOMIYA i Hideo NAKAJIMA. "Plastic Deformation Processes of Lotus-Type Porous Metals". Journal of the Japan Society for Technology of Plasticity 52, nr 601 (2011): 206–11. http://dx.doi.org/10.9773/sosei.52.206.

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34

Svetlana N., Kolupaeva, Ryumkin Valeriy I. i Petelin Alexander E. "Mathematical Modeling of Plastic Deformation in FCC Metals". Journal of Siberian Federal University. Mathematics & Physics 11, nr 2 (maj 2018): 242–48. http://dx.doi.org/10.17516/1997-1397-2018-11-2-242-248.

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35

Huang, M., P. E. J. Rivera-Díaz-del-Castillo, O. Bouaziz i S. van der Zwaag. "Irreversible thermodynamics modelling of plastic deformation of metals". Materials Science and Technology 24, nr 4 (kwiecień 2008): 495–500. http://dx.doi.org/10.1179/174328408x294125.

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36

Valiev, R. Z., i I. V. Aleksandrov. "A paradox of severe plastic deformation in metals". Doklady Physics 46, nr 9 (wrzesień 2001): 633–35. http://dx.doi.org/10.1134/1.1408991.

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YOSHIDA, Hajime, Yozo SAWAKI, Yoshihisa SAKAIDA i Tuneharu KAMIO. "502 Joining of Different Metals by Plastic Deformation". Proceedings of Yamanashi District Conference 2006 (2006): 109–10. http://dx.doi.org/10.1299/jsmeyamanashi.2006.109.

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38

Xing, H., J. Sun, Q. Yao, W. Y. Guo i R. Chen. "Origin of substantial plastic deformation in Gum Metals". Applied Physics Letters 92, nr 15 (14.04.2008): 151905. http://dx.doi.org/10.1063/1.2908040.

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Polyakov, V. V., G. V. Syrov i B. F. Dem'yanov. "Special features of plastic deformation of porous metals". Metal Science and Heat Treatment 38, nr 3 (marzec 1996): 120–22. http://dx.doi.org/10.1007/bf01401440.

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40

Rudskoy, A. I., A. A. Bogatov, D. Sh Nukhov i A. O. Tolkushkin. "New Method of Severe Plastic Deformation of Metals". Metal Science and Heat Treatment 60, nr 1-2 (maj 2018): 3–6. http://dx.doi.org/10.1007/s11041-018-0231-4.

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41

Huang, Xiaoxu. "Characterization of nanostructured metals produced by plastic deformation". Journal of Materials Science 42, nr 5 (16.12.2006): 1577–83. http://dx.doi.org/10.1007/s10853-006-0988-5.

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42

Elfmark, J. "Plasticity limit of metals during hot plastic deformation". Czechoslovak Journal of Physics 35, nr 3 (marzec 1985): 269–74. http://dx.doi.org/10.1007/bf01605095.

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43

Williamson, M., i A. Majumdar. "Effect of Surface Deformations on Contact Conductance". Journal of Heat Transfer 114, nr 4 (1.11.1992): 802–10. http://dx.doi.org/10.1115/1.2911886.

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This study experimentally investigates the influence of surface deformations on contact conductance when two dissimilar metals are brought into contact. Most relations between the contact conductance and the load use the surface hardness to characterize surface deformations. This inherently assumes that deformations are predominantly plastic. To check the validity of this assumption, five tests were conducted in the contact pressure range of 30 kPa to 4 MPa, with sample combinations of (I) smooth aluminum-rough stainless steel, (II) rough aluminum-smooth stainless steel, (III) rough copper-smooth stainless steel, (IV) smooth copper-rough stainless steel, and (V) smooth aluminum-smooth stainless steel. The experimental results of tests I, II, and IV indicate that the conductance of the first load-unload cycle showed hysteresis, suggesting that the plastic deformation was significant. However, for subsequent load cycles, no conductance hysteresis was observed, implying that elastic deformation was predominant. In contrast, no conductance hysteresis was observed for all load-unload cycles of tests III and V. Therefore, the surface deformation for this combination was always predominantly elastic. In practical applications where plastic deformation is significant for the first loading, mechanical vibrations can produce oscillating loads, which can finally lead to predominance of elastic deformation. Comparison of the results of tests II and V show that even though plastic deformation was significant for the first loading of a rough aluminum surface, elastic deformation was always predominant for the smoother aluminum surface

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44

Barannikova, S. A., i P. V. Iskhakova. "Study of deformation structures maps in metals under tension". PNRPU Mechanics Bulletin, nr 3 (15.12.2022): 107–15. http://dx.doi.org/10.15593/perm.mech/2022.3.11.

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The paper considers the regularities of macroscopic inhomogeneity of plastic flow during uniaxial tension of flat samples of Fe-Cr-Ni 2 mm thick. Their tension axis was oriented along the rolling direction. The average grain size was 12.5 ± 3 mm. The plastic flow curves of the alloy had long stages of linear strain hardening over the entire test temperature range 180 K < T < 297 K. For the experimental study of plastic deformation, we used the method of accurately reconstructing the fields of displacement vectors and calculating the components of the plastic distortion tensor using speckle photography with increments of the total strain between exposures 0.001. The field of displacement vectors as a whole over the sample during loading is inhomogeneous both in the directions of the displacement vectors and in values; in some areas, the displacement vectors nonmonotonically change directions relative to the tension axis. It has been established that in the test temperature range 180 K < T < 297 K, plastic flow is localized at all stages of the process. The appearance of the a′-martensite phase during the deformation of the alloy under study leads to a change in the mechanical characteristics, the work hardening coefficient, and the deformation localization parameters. The maps of deformation structures are analyzed in the form of spatial distributions of the components of the plastic distortion tensor: local elongations, narrowings, shifts and rotations. The non-linear nature of the change in the coefficient of transverse deformation from the level of acting stresses is established. The general form and quantitative parameters of the evolution of the components of the plastic distortion tensor indicate the connection of this process with the self-organization of a defective subsystem in a deformable medium.

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Brown, Donald W., Sean R. Agnew, S. P. Abeln, W. R. Blumenthal, Mark A. M. Bourke, M. C. Mataya, Carlos Tomé i Sven C. Vogel. "The Role of Texture, Temperature and Strain Rate in the Activity of Deformation Twinning". Materials Science Forum 495-497 (wrzesień 2005): 1037–42. http://dx.doi.org/10.4028/www.scientific.net/msf.495-497.1037.

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Plastic deformation in cubic metals is relatively simple due to the high crystallographic symmetry of the underlying structure. Typically, one unique slip mode can provide arbitrary deformation. This is not true in lower symmetry hexagonal metals, where prismatic and basal slip (the usual favored modes) are insufficient to provide arbitrary deformation. Often, either pyramidal slip and/or deformation twinning must be activated to accommodate imposed plastic deformation. The varied difficulty of activating each of these deformation mechanisms results in a highly anisotropic yield surface and subsequent mechanical properties. Further, the relative activity of each deformation mode may be manipulated through control of the initial crystallographic texture, opening new opportunities for the optimization of mechanical properties for a given application.

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Sakharova, Nataliya A., Milena M. Vieira, José Valdemar Fernandes i Manuel F. Vieira. "Strain Path Change Effect on Deformation Behaviour of Materials with Low-to-Moderate Stacking Fault Energy". Materials Science Forum 587-588 (czerwiec 2008): 420–24. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.420.

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Stacking fault energy (SFE) plays an important role in face centred cubic (f.c.c.) metals and alloys in determining the prevailing mechanisms of plastic deformation. Low SFE metals and alloys have a tendency to develop mechanical twinning, besides dislocation slip, during plastic deformations. Deformation behaviour and microstructure evolution under simple and complex strain paths were studied in 70/30 brass, with small and intermediate grain sizes, which corresponds to a f.c.c. material with low SFE. Simple (rolling and tension) and complex (tension normal to previous rolling) strain paths were performed. The macroscopic deformation behaviour of materials studied is discussed in terms of equivalent true stress vs. equivalent true strain responses and strain hardening rates normalized by shear modulus (dσ/dε)/G as vs. (σ – σ0)/G (σ0 is the initial yield stress of the material and G is the shear modulus). The mechanical behaviour is discussed with respect to dislocation and twin microstructure evolution developed in both, simple and complex strain paths.

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Kobler, Aaron, Christian Brandl, Horst Hahn i Christian Kübel. "In situ observation of deformation processes in nanocrystalline face-centered cubic metals". Beilstein Journal of Nanotechnology 7 (19.04.2016): 572–80. http://dx.doi.org/10.3762/bjnano.7.50.

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The atomistic mechanisms active during plastic deformation of nanocrystalline metals are still a subject of controversy. The recently developed approach of combining automated crystal orientation mapping (ACOM) and in situ straining inside a transmission electron microscope was applied to study the deformation of nanocrystalline Pd x Au1− x thin films. This combination enables direct imaging of simultaneously occurring plastic deformation processes in one experiment, such as grain boundary motion, twin activity and grain rotation. Large-angle grain rotations with ≈39° and ≈60° occur and can be related to twin formation, twin migration and twin–twin interaction as a result of partial dislocation activity. Furthermore, plastic deformation in nanocrystalline thin films was found to be partially reversible upon rupture of the film. In conclusion, conventional deformation mechanisms are still active in nanocrystalline metals but with different weighting as compared with conventional materials with coarser grains.

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Swygenhoven, H. van, P. M. Derlet, Z. Budrovic i A. Hasnaoui. "Unconventional deformation mechanism in nanocrystalline metals?" International Journal of Materials Research 94, nr 10 (1.10.2003): 1106–10. http://dx.doi.org/10.1515/ijmr-2003-0201.

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Abstract In this paper, suggestions from molecular dynamics on the plastic deformation mechanism of nanocrystalline (nc) fcc metals are discussed. Investigation of the local average stress in the grain boundaries during deformation highlights the role of the non-equilibrium grain boundary structure in both inter- and intra-deformation processes. The relevance of the mechanism suggested by computer simulations is discussed in terms of the inherent restrictions of the technique and experimental observations.

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Rusin, N. M., T. M. Poletika, S. L. Girsova i V. I. Danilov. "Distinctive features of plastic strain localization under severe plastic deformation of metals". Russian Physics Journal 50, nr 11 (listopad 2007): 1111–17. http://dx.doi.org/10.1007/s11182-007-0163-8.

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Sugihara, Tatsuya, Anirudh Udupa, Koushik Viswanathan, Jason M. Davis i Srinivasan Chandrasekar. "Organic monolayers disrupt plastic flow in metals". Science Advances 6, nr 51 (grudzień 2020): eabc8900. http://dx.doi.org/10.1126/sciadv.abc8900.

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Adsorbed films often influence mechanical behavior of surfaces, leading to well-known mechanochemical phenomena such as liquid metal embrittlement and environment-assisted cracking. Here, we demonstrate a mechanochemical phenomenon wherein adsorbed long-chain organic monolayers disrupt large-strain plastic deformation in metals. Using high-speed in situ imaging and post facto analysis, we show that the monolayers induce a ductile-to-brittle transition. Sinuous flow, characteristic of ductile metals, gives way to quasi-periodic fracture, typical of brittle materials, with 85% reduction in deformation forces. By independently varying surface energy and molecule chain length via molecular self-assembly, we argue that this “embrittlement” is driven by adsorbate-induced surface stress, as against surface energy reduction. Our observations, backed by modeling and molecular simulations, could provide a basis for explaining diverse mechanochemical phenomena in solids. The results also have implications for manufacturing processes such as machining and comminution, and wear.

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