Compressive Deformation of Semi-Solid AZ91D Magnesium Alloy

The compression tests of semi-solid AZ91D magnesium alloy have been conducted on Gleeble1500 hot simulation equipment. The results show that for the same strain rates, the higher the deformation temperature is, the lower the compressing stress of the samples is; the same strain rates and the same deformation temperatures, the compressing stress of the sample with spherical primary α-Mg solidified under electromagnetic stirring is much lower than that of the sample with dendritic primary α-Mg; the compressed amount does not apparently affect the relationship between the compressing stress strain under the same deformation conditions. When the strain rates and deformation temperatures are 0.1, 10 s-1 and 480-556℃ respectively, the stable stresses of the samples with spherical primary α-Mg grains are about 3-17.13 MPa, but those with dendritic grains are about 6-31.6 MPa; at the deformation temperature of 508℃ and strain rates ranging of 0.01- 20 s-1, the stable stresses are about 4.78-9.09 MPa and 7.87-26.21 MPa for the samples with spherical and dendritic primary a-Mg grains, respectively.