Laser additive manufacturing foam aluminium-12 wt-% silicon with different addition TiH2 foaming agent

Abstract

ABSTRACTThe aim of this work is to study the effects of laser additive manufacturing on microstructure and mechanical properties of foam Al–12 wt-%Si aluminium alloy with/without TiH2 foaming agent. The results showed that low porosity closed foam Al–12Si was successfully obtained. The effect of processing parameters on the porosity is discussed. The porosity was changed from initial 20.9% without foaming agent to 32.3 and 45.9% with 5 and 10% addition of foaming agent, respectively. Average micro-hardness values of the obtain foam Al–Si alloy is varied from 100 to 130 HV and the shape of compressive stress–strain curve is as the same as foam aluminium made by powder metallurgy and casting methods.