Abstract
0_ Mg EXPERIMENTAL Material The air-atomized AI-Mg-Si (HE9) alloy powder, supplied by Borax Consolidated Limited, nominally contained 0·5 wt.-%Mg, 0·5 wt.-%Si, balance AI. Initially the powder particle size distribution was obtained using standard 200 mm BS sieves stacked on an Endrock mechanical shaker to sieve a standard weight of powder (175 g) for a specified time (1 h). The results are shown in Table I. Samples of the powder were analysed by the Imperial College Analytical Services Laboratory. The chemical composition is given in Table II. precipitates may together be expected to alter the heattreatment reaction. There appears to be no reported literature on this subject. The AIMg-Si system, when aluminium-rich, is among the most widely used aluminium alloys, having architectural and structural applications. The object of the present work was to examine the rate-controlling deformation mechanism, the nature of product densification, the alloy structure, and the effect of oxide dispersions on the ageing process.
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