The casting-forging integrated technology was used to prepare AZ91 D magnesium alloy.The effects of forging deformation rate on microstructure and mechanical properties of AZ91 Dmagnesium alloy were investigated.The results show that

with the increase of forging deformation rate

the forced feeding effect on the solidification alloys in die cavity is enhanced

and the shrinkage cracks and shrinkages in AZ91 D magnesium alloy are decreased

and the ultimate tensile strength and the elongation of AZ91 D magnesium alloy are increased.When the forging deformation rate reaches more than 2mm

the shrinkage cracks and shrinkages in AZ91 D magnesium alloy can be eliminated.When the forging deformation rate reaches 5mm

the ultimate tensile strength and the elongation of AZ91 Dmagnesium alloy are 240.3 MPa and 4.14%

which are improved by 34.7% and 52.7%

respectively

compared with those of AZ91 D magnesium alloy without forging.