【摘要】 为了探索细晶Mg-Ce中间合金对AZ91D的变质效果,通过铜模喷铸法制备了细晶Mg-Ce中间合金,在此基础上研究了其对AZ91D组织和性能的影响。结果表明:经过铜模喷铸获得的细晶Mg-Ce中间合金中Mg₁₂Ce相的平均尺寸由50μm下降至10μm,相比于粗晶Mg-Ce中间合金,组织显著细化;细晶Mg-Ce中间合金的变质效果好于粗晶Mg-Ce中间合金,采用细晶MgCe中间合金变质的AZ91D相较于粗晶Mg-Ce中间合金变质的AZ91D,抗拉强度提高了5.23%,延伸率提高了15.14%,维氏硬度提高了6.92%,腐蚀速率降低了44.62%。因此,铜模喷铸是提高Mg-Ce中间合金变质效果的有效手段。更多还原

【Abstract】 In order to research the modification effect of fine-grained Mg-Ce master alloy on AZ91 D,fine-grained Mg-Ce master alloy was prepared by copper mold inject casting and the influence of it on the microstructure and properties of AZ91 Dalloy was investigated.Results showed that the size of Mg₁₂Ce phase in fine-grained Mg-Ce master alloy was reduced from 50μm to 10μm,which indicated the fine-grained Mg-Ce master alloy had been refined dramatically.The modification effect of fine-grained Mg-Ce master alloy was better than that of coarse-grained Mg-Ce master alloy.Compared with AZ91 D modified by coarse-grained Mg-Ce master alloy,the tensile strength,elongation rate and Brinell hardness of AZ91 D modified by fine-grained Mg-Ce master alloy increased by 5.23%,15.14% and 6.92% respectively,and the corrosion rate decreased by 44.62%.Therefore,copper mold inject casting is an effective way to improve the modification effect of Mg-Ce master alloy.更多还原