Abstract
The hot ductility behaviour of the Al–Li alloy 2091–T3 was investigated using hot ductility testing of the simulated heat affected zone (HAZ) using a Gleeble 1500 machine. Alloy 2091 displayed lower ductility, greater susceptibility to HAZ cracking, and poor ductility recovery on cooling from the nil strength temperature, compared with alloy 2219. Optical metallography and electron microscopy revealed that the ductility loss was accompanied by fracture transition from ductile transgranular mode to brittle intergranular mode. It was found that the HAZ intergranular liquation cracking was caused by non-equilibrium eutectic melting of T2 phase precipitated at grain boundaries.
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