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

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 precipitat...

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Bibliographic Details
Main Author: Tuan, N. Q. (author)
Other Authors: Pinto, A. M. P. (author), Puga, Hélder (author), Rocha, L. A. (author), Barbosa, J. (author)
Format: article
Language:eng
Published: 2014
Subjects:
Aluminium–scandium alloys
Ytterbium
Age-hardening
Precipitate coarsening
TEM
High-resolution TEM
Engenharia e Tecnologia::Engenharia dos Materiais
Science & Technology
Online Access:http://hdl.handle.net/1822/34523
Country:Portugal
Oai:oai:repositorium.sdum.uminho.pt:1822/34523
Description
Summary: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 Al3(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.

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