A comparative study on precipitation behavior of a sand-cast Al–Li–Cu alloy with the different quenching rates

Effect of Ti content on microstructures and mechanical properties of cast Al-2Li-2Cu-0.5Mg alloy

“…Moreover, Ti may also affect the precipitation kinetics of the alloy during the aging treatment, which is similar to Zr and Sc elements that have been confirmed [16,17] . In cast high Li-containing Al-Li-Cu alloys, δ' particle is supposed to be the main strengthening phase due to the fewer nucleation sites for T 1 precipitation [18,19] . Researchers pointed out that δ' phase and δ'-precipitation free zone (PFZ) cause dislocations slip and shear repeatedly on the same slip plane, which results in stress concentration near grain boundaries, and thus a poor ductility and fracture toughness [20,21] .…”