Influence of the Phase Composition and Texture on the Elastic Properties of Al–Cu–Li Alloys

Abstract

The influence of the crystallographic texture and phase composition of 1441, V-1461, and V-1469 alloy sheets of the Al–Cu–Li system on the anisotropy of Young’s modulus is studied. The {110}\(\left\langle {112} \right\rangle \) brass-type texture is shown to form in the sheets and to cause the same anisotropy of the elastic modulus of the alloys: the maximum value in the direction transverse to the rolling direction and the minimum value in the direction at an angle of 45°. This corresponds to the peculiarities of elastic anisotropy of aluminum. The quantitative ratios of the δ' (Al₃Li) and T₁ (Al₂CuLi) phases are determined using a unique procedure of phase analysis, and their elastic moduli are estimated. Young’s modulus averaged over three chosen directions (along and across the rolling direction and at an angle of 45°) is found to be proportional to the total content of intermetallic compounds.