Influence of Li addition on mechanical property and aging precipitation behavior of Al-3.5Cu-1.5Mg alloy

Characterization of phases, tensile properties, and fracture toughness in aircraft‐grade aluminum alloys

“…Figure A shows the nanometric precipitates inside the grain, Figure B shows one of the most critical phases to increase the tensile properties on AA2050 T84 alloy. The Cu content, for example, increases the amount of T1 period, Figure B, that leads the increase in hardness and tensile stress . These microstructure characteristics cause higher values of the Young modulus to AA2050 T85 than AA7050 T7451 …”

“…The development of AA2050 alloy resulted in low‐density and high‐elasticity modulus even in cryogenic conditions . In AA2050 alloys, these phases are Al‐Li (δ), Al3Li (δ’), Al2CuLi (T1), Al6CuLi2 (T2), Al15Cu8Li2 (TB), Al2CuMg (S′), Al3Zr (β’), Al2Cu (θ’), and Al2Cu (Ω) . The precipitation of δ’ phase occurs during the aging of Al‐Li supersaturated solid solution whose composition contains Zr and Cu .…”

Corrosion Fatigue of Aluminum-Copper-Lithium Alloy 2050-T84 Submitted at Salt Spray and Aqueous Saline Solution

“…The presence of S 0 in the metal matrix restrains the movements of dislocations and promotes a homogeneous deformation and increases the strength of the alloy. According to Deng et al [9], the presence of lithium (Li) favors the formation of free zones precipitate (FZP) in the grain boundary, Figure 2, which affects fracture properties, increasing the ductility of the material.…”

Análise microestrutural, tenacidade à fratura e vida em fadiga das AA7050-T7451 e AA2050-T84 (Al-Li)

“…Segundo Deng (2014) e Radmilovic et al (1988), a zona livre de precipitados está relacionada com a exclusão de átomos ao redor do contorno de grãos. Isso ocorre devido à presença do Li, que reduz o número de vacâncias móveis, dificultando a formação de precipitados nos contornos de grãos (Deng, 2014).…”