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

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 sampl...

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Bibliographic Details
Published in:	Journal of alloys and compounds Vol. 796; pp. 321 - 330
Main Authors:	Medvedev, Andrey E., Murashkin, Maxim Y., Enikeev, Nariman A., Bikmukhametov, Ilyas, Valiev, Ruslan Z., Hodgson, Peter D., Lapovok, Rimma
Format:	Journal Article
Language:	English
Published:	Lausanne Elsevier B.V 05-08-2019 Elsevier BV
Subjects:	Alloys Aluminum base alloys Annealing Atom probe tomography Cerium Dislocation density Earth surface Electrical conductivity Electrical resistivity Heat resistance High-pressure torsion Intermetallic particles Lanthanum Mechanical properties Mechanical strength Morphology Plastic deformation Rare earth Solid solutions Spheroidizing Surface area Tensile stress Thermal resistance Thermal stability Ultrafines Electrical conductivity Rare earth Mechanical strength Intermetallic particles Atom probe tomography High-pressure torsion
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Summary:	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. [Display omitted] •Influence intermetallic morphology on structure and properties of Al alloys is studied.•The alloys were subjected to severe plastic deformation in different initial state.•HPT of Al-4.5(Ce,La) alloy results in supersaturated solid solution formation.•Application of pre-HPT heat treatment prevents the solid solution formation during HPT.•The diffusion of Ce and La in Al is provided by extra vacancy concentration.
ISSN:	0925-8388 1873-4669
DOI:	10.1016/j.jallcom.2019.05.006