稀土Ce改性Mg-Zn合金的制备及性能研究  

Preparation and properties of rare earth Ce-modified Mg-Zn alloy

作　　者：李伟 胡俊梅 贾亚娟[1] LI Wei;HU Junmei;JIA Yajuan(Xi'an Traffic Engineering Institute,Xi'an 710300,China)

机构地区：[1]西安交通工程学院,西安710300

出　　处：《功能材料》2022年第12期12203-12207,共5页Journal of Functional Materials

基　　金：国家自然科学基金项目(61573009);陕西省教育厅科研计划项目(21JK0746)。

摘　　要：以Mg-Zn合金为基体,添加不同量含量的稀土元素Ce,通过铸造法制备了稀土Ce改性的Mg-Zn合金。采用扫描电镜(SEM)、X射线衍射仪(XRD)、电子万能试验机等研究了稀土元素Ce掺入量对铸造Mg-Zn合金晶体结构、微观形貌和力学性能的影响,以期制备具有较高综合性能的稀土镁合金。结果表明,稀土Ce元素添加到Mg-Zn合金后形成了Al_(4)Ce,提高了Mg-Zn合金的结晶性,使合金的晶粒平均尺寸得到了细化,断裂行为呈现出韧性断裂,当稀土Ce掺杂量为0.8%(质量分数)时,Mg-Zn合金断口的韧窝数量分布最多,晶粒尺寸最小约为3.8~4.2μm;掺入稀土Ce元素后,显著提高了Mg-Zn合金的硬度、拉伸强度和断裂延伸率,当稀土Ce掺杂量为0.8%(质量分数)时,Mg-Zn合金的拉伸强度和断裂延伸率达到了最大值,分别为192.5 MPa和8.5%,此时Mg-Zn合金的硬度也基本达到了稳定值52.8 HB。综合分析可知,稀土Ce元素的最佳掺杂量为0.8%(质量分数)。Rare earth Ce-modified Mg-Zn alloy was prepared by casting method with Mg-Zn alloy as matrix and different content of rare earth element Ce.Scanning electron microscope(SEM),X-ray diffraction(XRD)and electronic universal testing machine were used to study the effect of the amount of rare earth element Ce on the crystal structure,micro morphology and mechanical properties of cast Mg-Zn alloy,in order to prepare rare earth magnesium alloy with high comprehensive properties.The results showed that the addition of rare earth Ce to Mg-Zn alloy formed Al_(4)Ce,which improved the crystallinity of Mg-Zn alloy,refined the average grain size of the alloy,and presented ductile fracture behavior.When the content of rare earth Ce was 0.8 wt%,the number of dimples on the fracture surface of Mg-Zn alloy was the most,and the grain size was the smallest,about 3.8-4.2μm.After adding rare earth Ce,the hardness,tensile strength and fracture elongation of Mg-Zn alloy were significantly improved.When the doping amount of rare earth Ce was 0.8 wt%,the tensile strength and fracture elongation of Mg-Zn alloy reached the maximum,which were 192.5 MPa and 8.5%respectively.At this time,the hardness of Mg-Zn alloy basically reached the stable value of 52.8 HB.Comprehensive analysis shows that the optimum doping amount of rare earth Ce is 0.8 wt%.

关 键 词：MG-ZN合金 Ce元素 Al_(4)Ce相 微观形貌 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]