Abstract
This study investigated the embrittlement of aluminium powder metallurgy (P/M) alloy X7091 and the similar ingot metallurgy (I/M) alloy 7175 by liquid mercury (HgL) and a liquid mercury—gallium solution. The variables examined were duration of pre-test exposure to liquid metal before loading, specimen orientation, grain size and texture, test temperature, and pre-strain before exposure. The liquid metal embrittlement (LME) fracture path was invariably intergranular so grain boundary segregation was measured by Auger electron spectroscopy of specimens pre-exposed to liquid gallium (to induce intergranular failures) that were fractured under high vacuum. The P/M alloy was found to be less susceptible to LME than the I/M alloy. Two embrittlement mechanisms were identified — adsorption-dependent LME and a grain boundary corrosion reaction in which HgL dissolves MgZn2 precipitates. P/M X7091 exhibits less grain boundary segregation of magnesium than does I/M 7175, which partially explains the lower susceptibility of the P/M alloy.
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