Identification of the “Overburning” Phenomenon for Alloy 2014 Semiproducts

Resumo

The microstructure of hardened bars from aluminum alloy 2014 of the Al – Cu – Mg – Si system is analyzed. Metallographic investigation of the morphological features and of the element composition of the structural components of the alloy with features of overburning is performed using scanning electron microscopy and energy dispersion x-ray spectroscopy. The specific symptoms of the phenomenon of “overburning” in alloy 2014 are studied: 1) coarsening of inclusions of a complex chemical composition Al₁₅ (Fe, Mn)₃Si₂; 2) appearance of intergranular globules about 10 μm in size that form the matrix structure of a copper-rich phase with finely dispersed inclusions of Al₁₅(Fe, Mn)₃Si₂ phase. The mechanism of structure formation pointing to overburning is considered.