Abstract
Tin containing a fine dispersion of oxide has been prepared by the extrusion of atomized tin powder into rod. The oxide dispersion was stable up to ≮ 200°C and its presence influenced the grain growth of the tin. The hardness and tensile-strength values of the extruded tin powder were about twice those of cast tin and were independent of the oxide content of the powder within the range 0·2-1·5 wt.-%. This indicated that the dispersion of the oxide, governed by the particle size of the powder, was of more importance than the thickness of the oxide films.
Stress-to-rupture tests at 150°C showed the material made from powder to be markedly superior to either unalloyed tin or a tin–6% antimony alloy. The best Eltress-to-rupture properties were obtained in dispersion-hardened material heat-treated to give a fibrous structure of relatively large grains, elongated in the extrusion direction. Possible applications of dispersion-hardened tin are briefly considered.
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