【摘要】 利用Gleeble1500热模拟机对半固态AZ91D镁合金的变形规律进行了研究.结果表明:当应变速率相同时,变形温度越高,半固态AZ91D镁合金试样的变形应力就越低;当应变速率和变形温度相同时,半固态球状晶试样的压缩变形应力明显低于枝晶试样的压缩变形应力;变形量对半固态压缩试样的应力-应变关系的影响很小.当应变速率为0.1,10 s-1和变形温度为480-556℃时,球状晶和枝晶试样的稳定压缩应力分别为3-17.13 MPa和6-31.6 MPa.当变形温度为508℃和应变速率为0.01-20 s-1时,球状晶和枝晶试样的稳定压缩应力分别为4.78-9.09 MPa和7.87-26.21 MPa.更多还原

【Abstract】 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.更多还原