This report discusses studies revealing the tensile properties, hot hardness, and heat treatment characteristics of uranium alloys with added aluminum or zirconium.

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The tensile properties, hot hardness, and heattreatment characteristics of urarnium alloys containing up to 2.9 at.% aluminum or 4.0 at.% zirconium are described. The data shown that zirconium has a favorable effect upon the grain size, hardness, and tensile strength of uranium without materially affecting ductility. Additions of 3.8 at. % zirconium raised the tensile strength of uranium at room temperature fiom about 100,000 psi to about 200,000 psi, while the elongation in 2 in. increased from 14 to 22% and the grain size decreased from about 0.20 mm to less than O.01 mm. The data show that aluminum raises the yield strength, that it has very little effect on either the grain size, hardness, or tensile strength of uranium, and that it decreases ductility. The addition of 2.6 at.% aluminum decreased ihe roomtemperature ductility of ur-anium from l4 to 4%. (auth)

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