Effects of substituting ytterbium for scandium on the microstructure and age-hardening behaviour of Al-Sc alloy

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Tuan, N. Q.
Pinto, A. M. P.
Puga, H.
Rocha, L. A. [UNESP]
Barbosa, J.

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Elsevier B.V.


In order to reduce the cost of Al-Sc alloys and maintain their mechanical properties, the microstructure and mechanical properties of Al-0.24 wt% Sc-0.07 wt% Yb in comparison with Al-0.28 wt% Sc alloys were studied. The aging behaviour, precipitate morphologies, precipitate coarsening and precipitation hardening of both alloys were investigated. The average diameter and the size distribution of nanoscale Al3Sc and Al-3(Sc,Yb) precipitates at various aging conditions were measured. Transmission electron microscopy (TEM) and high-resolution TEM were used to deeply understand the precipitate evolution. A maximum hardness around 73 (HV30) was obtained with a precipitate diameter from 4.3 to 5.6 nm for both alloys. (c) 2014 Elsevier B.V. All rights reserved.



Aluminium-scandium alloys, Ytterbium, Age-hardening, Precipitate coarsening, TEM, High-resolution TEM

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Materials Science And Engineering A-structural Materials Properties Microstructure And Processing. Lausanne: Elsevier Science Sa, v. 601, p. 70-77, 2014.