Effects of Rheological Casting Slurry Temperature on Microstructure and Mechanical Properties of AlSi7Mg Alloy

Die castings of AlSi7Mg aluminum alloys were produced by rheological casting.The microstructure of the die castings with different slurry temperatures was observed, and the mechanical properties of the die castings produced with different parameters were tested.The results show that the cooling rate of automotive rheological die-casting AlSi7Mg alloy increases gradually with the increase of slurry temperature under different slurry temperatures; the average grain size of the alloy increases with the decrease of slurry temperature.The tensile strength of the alloy increases firstly and then decreases with the increase of slurry temperature.The elongation after fracture of the alloy increases with the decrease of the slurry temperature.When the slurry temperature is 600 ℃, the mechanical properties of the rheological die-cast AlSi7Mg alloy for automobiles are best.