中文摘要：

研究了5083合金添加1.5%~5%Zn（质量分数）对合金显微组织和力学性能的影响.通过SEM和EDS对铸态、均匀化处理后和轧制态合金的微观组织进行了表征并测试轧制态合金的拉伸性能.结果表明：铸态合金随Zn含量的增加偏析程度增加,金属间化合物主要为富Mg和富Zn相.均匀化处理后的合金具有良好的轧制性能,均匀化处理后合金金属间化合物量明显减少,部分未溶金属间化合物是Mg_2Si和Al_3Fe相.轧制显著降低晶粒尺寸,轧制试样的晶粒尺寸约150 nm.随着Zn含量增加轧制态合金的屈服强度和抗拉强度增加,延伸率有所下降.

英文摘要：

When 1. 5% ？5% Zn（ mass fraction） element was added into 5083 alloy,the effect of Zn on microstructure and mechanical properties was investigated. The microstructures of as- cast, homogenized and rolled alloys were characterized by SEM and EDS and mechanical property of the rolled alloy was obtained in a tensile test. It was found that the segregation in as-cast alloy increased with the additive of Zn and the second phases were mainly the rich-Mg and rich-Zn phases. After homogenization treatment,the homogenized alloy could be rolled more easily,the volume fraction of the second phase decreased significantly and the unresolved second phases were MgqSi and A^ Fe. The results also showed that the grain size of the rolled alloy decreased obviously to 150 nm. With the more additive of Zn,the yield and tensile strength of the rolled alloy increased,while the elongation decreased slightly.