Influence of the number of passes under equal-channel angular pressing on the elastic-plastic properties, durability, and defect structure of the Al + 0.2 wt % Sc alloy

Бетехтин, В. И.; Sklenička, V.; Saxl, Ivan; Kardashev, B. K.; Кадомцев, А. Г.; Narykova, M. V.

doi:10.1134/s1063783410080111

Cited by 25 publications

(12 citation statements)

References 16 publications

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“…Formation of voids similar to those were seen in the severely deformed Fe specimen processed by SRD, were not detected for the ECAP deformed Fe after 4 passes probably due to the mode of deformation which is applied by different SPD processes. However, the generation of micro crack after severe plastic deformation by ECAP was reported previously for Al-Mn alloy which are predominantly located in particles of the second phase and at interfaces of these particles [17]. The observations were verified using density measurements.…”

Section: Resultssupporting

confidence: 62%

On the atomic force microscopy characterization of void evolution in severely plastic deformed pure iron

Forouzanmehr¹,

Nili-Ahmadabadi²

2014

IOP Conf. Ser.: Mater. Sci. Eng.

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Section: Resultssupporting

confidence: 62%

On the atomic force microscopy characterization of void evolution in severely plastic deformed pure iron

Forouzanmehr¹,

Nili-Ahmadabadi²

2014

IOP Conf. Ser.: Mater. Sci. Eng.

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“…It is generally recognized that the ECAP process could produce a submicrocrystalline bulk material with a relatively uniform structure and 100% density for a wide range of materials from pure metals, solid-solution alloys, commercial alloys, to metal matrix composites [1]. However, the previously performed analysis of the data on the influence of the number of passes of equal-channel angular pressing on the elastic-plastic properties and defect structure of pure aluminium demonstrated that these characteristics of mechanical properties are substantially affected by the evolution of the nanoporosity formed during equal-channel angular pressing [13][14][15]. Thus, to determine the total volume of nanoporosity which could be generated by ECAP, two selected samples of pure aluminium were pressed for a total of one (specimen A1) and four (specimen A4) ECAP passes, respectively, and for comparison reasons some part of these specimens were underwent by subsequent pressurization treatment by high hydrostatic pressure [16].…”

Section: Nanoporosity After Ecap Processingmentioning

confidence: 99%

“…In the areas with the higher number of HAGBs the grain boundary sliding will be more intensive than in the surrounding areas [8]. The investigation of the unetched surfaces of the specimens after 2-8 ECAP passes and after creep exposure revealed the appearance of mesoscopic shear bands [14,15,35,[40][41][42] lying near to the shear plane of the last ECAP pass ( Figure 15). On the surface of specimens the mesoscopic shear bands were particularly observed near the fracture region and their frequency decreased rapidly with increasing distance from the fracture.…”

Section: Specimenmentioning

confidence: 99%

Equal-Channel Angular Pressing and Creep in Ultrafine-Grained Aluminium and Its Alloys

Sklenička¹,

Dvořák²,

Svoboda³

et al. 2012

Aluminium Alloys - New Trends in Fabrication and Applications

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“…After the hydrostatic compression, the 30 nm sample density increased to 8.625 g/cm 3 , which could be explained by a decrease in the porosity of the nano laminate. It should be noted that the necessity of allowing for the porosity as a factor influencing the elastic properties of nanomaterials was already pointed out in [7,8]. This probably also accounts for the increase in E observed in samples upon hydrostatic compression.…”

mentioning

confidence: 90%

Elasto-plastic properties of Cu-Nb nanolaminate

et al. 2012

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Multilayer composites with a layer thickness on a nanometer scale are called nanolaminates [1-3] and have good prospects for application as both structural and functional materials possessing special mechani cal, magnetic, and electrical properties due to unique combinations of characteristics of the component lay ers, in particular, metals. This stimulates investigations of various characteristics of nanolaminates, including the structural parameters, thermal stability, ultimate strength, flow stress, microhardness, etc. [4]. The elasto plastic properties of these multilayer compos ites with nanodimensional layers have been studied to a much lesser extent.In this work, acoustic measurements were used to determine the elasto plastic characteristics of q nano laminate of the Cu-Nb system, including the charac teristics of elastic deformation (Young's modulus E) and reversible microplastic deformation (amplitude independent decrement δ and microplastic flow stress σ) related to the oscillatory motion of dislocations. A special feature of the acoustic experiment is that, at moderate amplitudes, the dislocation structure of samples is retained and the density of dislocations in the metal remains unchanged [5].The samples were studied by a resonant method of a composite vibrator, which is described in much detail elsewhere [5]. Using this technique, it is possible to determine the Young's modulus E and study the absorption of ultrasound (i.e., internal friction) and inelastic (microplastic) properties of samples. The data on inelastic properties are obtained by measuring the E and δ values in a wide range of amplitudes of vibrational strain ε. At sufficiently large ε, a sample material exhibits nonlinear amplitude dependent absorption δ h = δ -δ i and amplitude dependent shift of the Young's modulus, which is defined as (ΔE/E) h = (E -E i )/E i , where E i and δ i are the Young's modulus and decrement determined at small amplitudes (for which both E and Δ are independent of ε).Using the results of acoustic measurements per formed in a wide range of vibration amplitudes, it also possible to evaluate the mechanical (microplastic) characteristics of materials in the conventional mechanical testing coordinates of stress versus inelas tic strain, where the ordinate represents the amplitude of vibrational stress σ = Eε and the abscissa represents the nonlinear inelastic strain ε d = ε(ΔE/E) h .The samples for acoustic measurements were rod shaped with a 2 × 0.5 mm rectangular cross section and a length of l = 20 mm, which corresponded to reso nance frequency longitudinal oscillations close to f 1 00 kHz. The Young's modulus was defined as E = 4ρl 2 f 2 , where ρ is the material density.The Cu-Nb nanolaminate was obtained by com plex rolling of copper and niobium sheets and repre sented a sandwich of these metals, in which the thick ness of each layer (see Fig. 1) was about 10 nm. The boundaries of these layers were oriented in the direc tion of propagation of a longitudinal acoustic wave. The effective density of the nanola...

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Influence of the number of passes under equal-channel angular pressing on the elastic-plastic properties, durability, and defect structure of the Al + 0.2 wt % Sc alloy

Cited by 25 publications

References 16 publications

On the atomic force microscopy characterization of void evolution in severely plastic deformed pure iron

On the atomic force microscopy characterization of void evolution in severely plastic deformed pure iron

Equal-Channel Angular Pressing and Creep in Ultrafine-Grained Aluminium and Its Alloys

Elasto-plastic properties of Cu-Nb nanolaminate

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