Year: 2013
Type: article
Abstract: The use of scandium as an alloying element in aluminium has gained an increasing interest even though scandium is difficult to extract, which makes the metal very expensive.The three principle effects that can be obtained by adding scandium to aluminium alloys are (i)grain refinement during casting or welding, (ii)precipitation hardening from Al 3 Sc particles and (iii)grain structure control from Al 3 Sc dispersoids.Addition of scandium in combination with zirconium is particularly effective, and the reason for this is linked to the recently discovered core/shell structure of the Al 3 (Sc,Zr) dispersoids.The effects that can be obtained from a Sc addition are to a large extent dependent on the alloy system to which it is added, and an overview of some effects in all the major classes of wrought aluminium alloys is given.Industrial use of Sc-containing aluminium alloy is so far limited to a few aerospace applications and to sporting equipment, further use is dependent on a price reduction of scandium. AL-SC MASTER ALLOYSWhen adding alloying elements to an aluminium melt, this can be done either by adding the pure elements or by adding the elements in the form of master alloys.Adding pure Sc to the melt is technologically feasible.From the binary phase diagram in Figure 2 [11,16] it is evident that unless the melt is heated to a temperature higher than approx.1185°C a sequence of phase
Author: Jostein Røyset
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W1577055498