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中文摘要：
研究稀土元素Ce对Mg-2Zn-Mn合金的组织和性能变化以及热变形特点的影响规律。通过采用常规金相、X射线、SEM、XRD分析,以及常温拉伸和热模拟压缩试验,比较Mg-2Zn-Mn-xCe合金的组织、合金相及变形性能的变化。结果表明：在实验范围内（0%~0.57%Ce（质量分数,下同））,随着Ce的添加,铸态组织先变粗后细化,强度和塑性先降低,后抗拉强度（UTS）逐渐升高至200MPa,屈服强度（YS）为74MPa,延伸率为20%;热压缩变形抗力随Ce含量的增加而逐渐增加。Mg-2Zn-Mn合金中添加微量Ce时,化合物变细小,MgZn相减少,出现Ce2Zn17,部分化合物相在二次枝晶间隙处分布;Ce含量增加至0.37%后,化合物为Ce3Zn22相和CeZn3相,随着Ce继续增加,化合物相主要在一次枝晶间隙处分布,呈网状。
英文摘要：
The effects of different Ce contents on the microstructure,mechanical properties and performance of hot deformation were investigated.By methods of OM,X-ray,SEM,XRD,tensile test at room temperature and hot compression test on Gleeble 1500D thermal-mechanical simulator,the changes of Mg-2Zn-Mn-xCe alloys in microstructure,second phase and mechanical performance were compared.The results show that with the increasing of Ce content,the as cast microstructure becomes coarse and then fine,while the strength and plasticity decrease firstly and then increase to the value of 200MPa for UTS（ultimate tensile strength）,74MPa for YS（yield strength） and 20% for elongation,and the deformation resistance of hot compression increases at the same time.When traces Ce adding,the compound particle becomes fine,the number of MgZn phase reduces,the Ce2Zn17 phase appears,some compound particles lie in secondary dendrite arm space.When Ce content is more than 0.37%,the particles change into Ce3Zn22 and CeZn3 phases,and with the increasing of the Ce content,the particles mainly exist in the primary dendrites spacing in shape of network.
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