The role of rare earths additions to aluminium-matrix composites

Abstract

Aluminium alloy (Al-5 wt.% Mg) matrix composites with ceramic particles (SiCp) as dispersoids and additions of 1-1.5 wt .% mischmetal ( 55 % Ce; 20 % La; 15 % Nd; 6.5 % Pr ; .36 % Fe; bal.others) have been synthesised by liquid metallurgy .Dur i ng preparation of the composites a reacted layer which contains rare earths ( La, Dy, Tb ) has been found to