Abstract
To determine the effect of the degree of oxide dispersion on the properties of dispersion-hardened tin, separated fractions of tin powder in the size range from 53 to < 8 μm have been formed into rod by extrusion. The room-temperature strength increased with decreasing powder particle size and this increase in strength was accompanied by a marked reduction in ductility. In contrast, raising the oxide content without changing the powder particle size had little effect on properties.
Stress-to-rupture testing at 100°C showed that the finest powder gave the best elevated-temperature properties and it was concluded that the degree of dispersion of the oxide, rather than the total amount of oxide, was the important factor. However, the retardation of grain growth at elevated temperatures appeared to be dependent on the total amount of oxide present rather than its degree of dispersion.
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