PURPOSE: To combinedly impart high specific strength and excellent hardenability and fatigue properties to an extruded material, in an Al-Li series allay extruded material by incorporating specified amounts of Mg and Zr, Cr, Mn, V, Ti or the like.
CONSTITUTION: The compsn. of an Al-Li series alloy-extruded material is constituted of a one contg., by weight, l.5 to 3.5% Li and 1.0 to 3.5% Mg and furthermore contg. one or ≥two kinds selected from 0.05 to 0.3% Zr, 0.05 to 0.3% Cr, 0.05 to 1.5% Mn, 0.05 to 0.3% V and 0.005 to 0.1 Ti, and the balance Al with inevitable impurities. Li is an essential element for the reduction of the density of this alloy into a low one and the improvement of its strength. In this alloy-extruded material, ingot-making is performed so that its grain size can be refined as possible after melting.
TSUJI YOSHIHIRO
HAGIWARA TAKUZO
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