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26 results on '"Murashkin, M.Yu."'

4. Influence of Severe Plastic Deformation on Microstructure, Strength and Electrical Conductivity of Aged Al–0.4Zr(Wt.%) Alloy

Author

Orlova T.S., Mavlyutov A.M., Latynina T.A., Ubyivovk E.V., Murashkin M.Yu., Schneider R., Gerthsen D., and Valiev R.Z.

Subjects
Technology, Chemical technology, TP1-1185
Abstract

Microstructure evolution of an Al-0.4Zr(wt.%) alloy after isothermal aging (AG) and subsequent high pressure torsion (HPT) and its impact on strength and electrical conductivity has been investigated. Microstructure was characterized by X-ray diffraction, electron backscatter diffraction, transmission electron microscopy (TEM) and electron energy-dispersive X-ray spectroscopy in TEM. The initial Al-0.4Zr(wt.%) alloy obtained by combined casting and rolling presents solid solution of Zr in Al matrix. Aging at 375 °C for 60 h leads to formation of uniformly distributed metastable Al3Zr precipitates with the average diameter of 13 nm, resulting thereby in a decrease of strength sUTS from 128 to 95 MPa and in increase of conductivity from 50.7 to 58.8% IACS at ambient temperature. The subsequent HPT processing leads to grain refinement and partial dissolution of the Al3Zr precipitates that is accompanied by enrichment of solid solution by Zr atoms and by coarsening of the remaining Al3Zr precipitates. The combination of AG and HPT provides the strength and the conductivity at ambient temperature which do not decrease under annealing up to 230 °C. Moreover, additional strengthening accompanied by an increase in conductivity was found for AG-HPT samples after annealing at Tan=230 °C for 1 h, that provides the best combination of the strength of sUTS=142 MPa and the conductivity of 58.3% IACS. Contribution of different possible mechanisms into strength and charge scattering are analyzed on the basis of specific microstructural features. The analysis indicates a suppression of strengthening by the Orowan mechanism in AG and AG-HPT samples. In all the studied states, i.e. initial, after AG, and subsequent HPT, grain boundary strengthening is found to be the main strengthening mechanism.

Published
2018
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16. Effect of SPD processing on mechanical behavior and dynamic strain aging of an Al-Mg alloy in various deformation modes and wide strain rate range

Author

Valdes Tabernero, Miguel Angel, Sancho Cadenas, Rafael, Sabirov, Ilchat, Murashkin, M.Yu, Ovid'ko, I.A., Gálvez Díaz-Rubio, Francisco, Valdes Tabernero, Miguel Angel, Sancho Cadenas, Rafael, Sabirov, Ilchat, Murashkin, M.Yu, Ovid'ko, I.A., and Gálvez Díaz-Rubio, Francisco

Abstract

This work focuses on the effect of grain size and deformation mode on mechanical behavior and dynamic strain aging (DSA) process in an Al5083 alloy. The UFG material with average grain size of 0.4 µm was produced by equal channel angular pressing with parallel channels (ECAP-PC) which resulted in dramatic improvement of mechanical strength while reducing tensile ductility of the alloy. Biaxial stretching formability of the UFG alloy is similar to that of its coarse-grained (CG) counterpart. Analysis of plastic flow in the strain rate range of 10−5–2.5·103 s−1 showed that DSA process occurs in both CG and UFG alloys in the strain rate range of 10−5–10−3 s−1, whereas it is suppressed at higher strain rates 10−1–2.5·103 s−1 due to lack of time for solute atoms to ‘arrest’ gliding dislocations. The ECAP-PC processing also modified the DSA process, reducing the absolute value of negative strain rate sensitivity and activity of localized plastic flow, as well as changing the type of flow serrations on the stress-strain curves. These observations are rationalized based on grain refinement and reduction of concentration of solute atoms in the grain refinement due to their segregations at grain boundaries, which occurs during severe plastic deformation of Al alloys. An effect of deformation mode on the DSA process is also reported.

Published
2017

19. Bulk Nanostructured Materials with Multifunctional Properties / by I. Sabirov, N.A. Enikeev, M.Yu. Murashkin, R.Z. Valiev.

Author

Sabirov, I. author., Enikeev, N.A. author., Murashkin, M.Yu. author., Valiev, R.Z. author., SpringerLink (Online service), Sabirov, I. author., Enikeev, N.A. author., Murashkin, M.Yu. author., Valiev, R.Z. author., and SpringerLink (Online service)

Abstract

This book presents a multifunctional approach to the design of bulk nanostructured metals through severe plastic deformation (SPD). Materials engineering has traditionally involved selecting a suitable material for a given application. However, modern engineering frequently requires materials with a set of multifunctional, often conflicting properties: Enhanced mechanical properties need to be combined with improved physical (electrical, magnetic, etc.) and/or chemical (corrosion resistance, biocompatibility) properties. So disparate materials properties need to be engineered and optimized simultaneously. These requirements have created a paradigm shift in which the classical materials selection approach is replaced by design of material microstructures to achieve certain performance requirements, subject to constraints on individual properties such as strength, conductivity, and corrosion resistance. Written by researchers at the forefront of this new materials design approach, the present volume provides a comprehensive introduction to multifunctional design of bulk nanostructured materials, with applications ranging from hydrogen storage to construction engineering.

Published
2015

26. Introduction

Author

Sabirov, I., Enikeev, N. A., Murashkin, M. Yu., Valiev, R. Z., Sabirov, I., Enikeev, N.A., Murashkin, M.Yu., and Valiev, R.Z.

Published
2015
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