Effect of yttrium addition and the powder size on oxide iim and powder ignition temperature of AZ91D magnesium alloy

摘要

This paper focused on the influence of yttrium (Y) addition and powder size (diameter) on the oxide film and powder ignition temperature of AZ91D alloy. Y addition in the alloy fell into 6 categories, namely 0 wt. percent, 0,15 wt. percent, 0.28 wt, percent, 0.45 wt. percent, 0.60 wt. percent and 1.0 wt. percent. The powders of 58 mum, 75 mum, 106 mum, 120 mum, 150 mum, 200 mum and 270 mum in diameter were used for analysis of the influence of powder size on oxidation resistance of alloy powders. During oxidation test, powder size had limited influence on the ignition temperature of the alloy powders. The specific area and inter-space of the powders showed opposite effect on the ignition temperature of the alloy. With increasing Y addition, the tightness of oxide film increased, thus ignition temperature increased, obtaining peak magnitude at 0.28 wt. percent Y addition. And then, it began to decrease with further increasing Y addition to 1.0 wt. percent.