Structure and Anisotropy of the Mechanical Properties of Hot- and Cold-Rolled Semi-Finished Products from Aluminium-Lithium Alloys
Research of structure and anisotropy of the mechanical properties of hot-and cold-rolled semi-finished products from Al-Mg-Li (1420 and 1424) and Al-Cu-Li (V-1461) alloys was conducted. Semi-finished products were made in industrial conditions by standard technologies. During the tension test ultimate strength, yield stress, elongation and coefficients of lateral strain in three directions (at 0°, 45° and 90° angles to the rolling direction) were determined in order to study the planar anisotropy. It was established that the main characteristic inherent to both the first generation of aluminium-lithium alloys (1420) and the subsequent ones (1424, V-1461) is a pronounced anisotropy of the mechanical properties including the characteristics of plastic strain. At the same time, as for most aluminium alloys, aluminium-lithium alloys are characterized by low values of the lateral strain coefficients. It leads to a number of negative consequences in the subsequent forming: distortion and dimensions alteration of parts, limitation of formability, metal losses due to overestimation of thickness and dimensions of blanks, weight increase of the construction.
Dr. Denis Solovev
Y. Erisov et al., "Structure and Anisotropy of the Mechanical Properties of Hot- and Cold-Rolled Semi-Finished Products from Aluminium-Lithium Alloys", Materials Science Forum, Vol. 945, pp. 611-616, 2019