engleski

Analysis of the low energy layering fracture in Al- 2.5Mg-0.7Li alloy

The mechanism of nucleation and propagation of low energy layering fracture, observed during thermo-mechanical testing of Al-2.5Mg-0.7Li alloy in as cast condition, was analyzed. Since the low energy layering fracture is affected by Li segregations and microstructural constituents’ development, solidification sequence of Al-2.5Mg- 0.7Li alloy was investigated in equilibrium and non-equilibrium conditions. Results of the investigations have shown that Mg has more pronounced effect on low energy layering fracture due to reducing solubility of Li in liquid phase and αAl, maximizing precipitation of hardening (Al3Li) δ’ phase, ternary (Al2LiMg) T phase and (Al8Mg5) β phase, and reducing ductility by solid solution hardening.

Al-Mg-Li alloy, phase precipitation, Li solubility, solidification sequence, low energy delamination fracture

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