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617 results on '"Valiev, R.Z."'

201. Influence of powder consolidation methods on the structural and thermal properties of a nanophase Cu-50wt%Ag alloy

Author

Shen, H., Li, Z., Günther, B., Korznikov, A.V., Valiev, R.Z., and Publica

Subjects
Kugelmahlen, Pulverpressen, Pulvermetallurgie, mechanisches Legieren, Kornwachstum, nanokristalliner Werkstoff, Röntgenbeugung, Mikrogefüge
Abstract

Nanocrystalline Ag-Cu powder compacts of identical composition have been prepared by 3 different methods: a) compaction of Ag-Cu alloy nanopowder prepared by inert gas condensation of a prealloy (IGC), b) mechanical alloying (MA) of elemental Ag and Cu powders, c) severe plastic deformation (SPID) of a course grained ingot material as well as of a compact of [GC and MA powder. The resulting microstructures have been studied as a function of annealing temperature by means of XRD and TEM in-situ. It is shown that IGC of the prealloy results in a duplex nanostructure, whereas MA and SPID lead to a metastable solid solution phase that decomposes to fine Ag and Cu on heating.

Published
1995

218. A nanostructural design to produce high-strength Al alloys with enhanced electrical conductivity.

Author

Valiev, R.Z., Murashkin, M. Yu., and Sabirov, I.

Subjects
*NANOSTRUCTURED materials, *STRENGTH of materials, *ALUMINUM alloys, *ELECTRIC conductivity, *ELECTRIC lines, *TENSILE strength, *MATERIAL plasticity, *GRAIN refinement
Abstract

The high strength and increased electrical conductivity of the Al alloys are highly desirable for their applications in power transmission lines. However, high strength and high electrical conductivity are mutually exclusive in metallic materials. A novel nanostructuring strategy is reported that achieves Al–Mg–Si alloys with superior tensile strength and enhanced electrical conductivity. The new strategy is based on a combination of grain refinement down to ultra-fine scale with accelerated formation of nanosized precipitates during severe plastic deformation. [ABSTRACT FROM AUTHOR]

Published
2014
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