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Effect of the eutectic Al-(Ce,La) phase morphology on microstructure, mechanical properties, electrical conductivity and heat resistance of Al-4.5(Ce,La) alloy after SPD and subsequent annealing
journal contributionposted on 2019-08-05, 00:00 authored by Andrey Medvedev, M Y Murashkin, N A Enikeev, Ilias Bikmukhametov, R Z Valiev, Peter HodgsonPeter Hodgson, Rimma Lapovok
This paper reports on a crucial role of the morphology of intermetallic Al11RE3 phase and Al/Al11RE3 interphase (where RE – Rare Earth) surface area, before plastic deformation, on the electrical and mechanical properties and the thermostability of aluminium alloys. Cast Al-4.5 (Ce + La) alloy samples, processed with and without spheroidization treatment (ST), were subjected to high pressure torsion (HPT) at room temperature (RT) followed by annealing at 230 °C, 280 °C and 400 °C for 1 h. It is demonstrated, that the changes of initial alloy structure (particles shape/size) and the decrease of interphase surface area affect the distribution of intermetallic particles after HPT, the distribution of ultrafine grains and the dislocation density, as well as the formation of a supersaturated solid solution of Ce and La in aluminium. The optimal combination of strength (ultimate tensile stress (σUTS) 430 MPa) and conductivity (55.9% International Annealed Copper Standard, IACS) was obtained after ST, HPT and an annealing temperature of 230 °C.
JournalJournal of alloys and compounds
Pagination321 - 330
LocationAmsterdam, The Netherlands
Publication classificationC1 Refereed article in a scholarly journal
Copyright notice2019, Elsevier B.V.
Rare earthHigh-pressure torsionIntermetallic particlesMechanical strengthElectrical conductivityAtom probe tomographyScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringChemistryMaterials ScienceSEVERE PLASTIC-DEFORMATIONGRAIN-BOUNDARYSOLID-SOLUTIONALSTRENGTHZRSEGREGATIONMETALSDESIGNGROWTHCondensed Matter Physics