Analysis on Microstructure of AlSi7Cu5 Alloy Obtained by Slope-liquidus Method
The casting microstructure and its change during remelting of AlSi7Cu5 alloy cast by slope-liquidus method were researched.The results show that it has a significant impact on microstructure by cooling methods,casting molds and pouring methods.The microstructure of AlSi7Cu5 alloy obtained by slope liquidus method is uniform and small equiaxed.Its average grain diameter is 55.2 μm,and its average grain size roundness is 2.13.The reheated microstructure which can be applied to thixo-forming preferable will be obtained by keeping constant temperature 25 min at 580 ℃.