The Al-Mg bimetallic castings were prepared by lost foam casting（LFC）

and effects of pouring temperature on interface layers of the Al/Mg bimetallic castings processed by lost foam casting were investigated by optical microscopy（OM）

scanning electron microscopy（SEM）

energy-dispersive X-ray spectroscopy（EDS）and X-ray diffractometer（XRD）.The results show that thickness of the interface layer of the Al-Mg bimetal alloy is increased with the increase of the pouring temperature.With a pouring temperature of 730 ℃

a compact and uniform interface layer can be observed.When the pouring temperature is less than 730 ℃

there exist porosity defects in the interface layer of Al-Mg bimetallic castings

while the pouring temperature is more than 730 ℃

the thickness exhibits un-even interface layers of Al/Mg bimetallic castings.At different pouring temperatures

all the interface layers of Al/Mg bimetallic castings are composed of three different reaction layers:the Mg17Al12+δ-Mg eutectic closed to magnesium

the Mg

17

Al

12

+ Mg

2

Si in the interface and the Al

3

Mg

2

+ Mg

2

Si nearby aluminum.