Preparation of foamed magnesium alloy by two-stage process was conducted

and effects of addition of foaming agent

viscosity-increament agent and Al on structure of foamed magnesium alloy were investigated. Experimental results show that foamed magnesium alloy with uniform structure and high porosity can be obtained by controlling the addition of foaming agent

viscosity-increament agent and Al. With the addition of foaming agent or viscosity-increament agent far more or far less

bubble-free layer and large gas cavity can be observed in foamed magnesium alloy. Heterogeneous structure in foamed magnesium alloy is a common phenomenon without Al addition in melt. With the addition of 2%

6

% Al

dumping fluidity of melt is improved

and pore size of foamed magnesium alloy becomes homogeneous. With the addition of foaming agent or viscosity-improved agent increases

porosity of foamed magnesium alloy is increased firstly and then decreased. When the addition of foaming agent is 2% or viscosity-increasing agent is 0.1%

the foamed magnesium alloy exhibits desirable porosity. With the increase of the addition of Al in melt

the porosity of foamed magnesium alloy is increased.