变质剂Nd对Mg-3Si-4Zn-xNd合金组织及硬度的影响  

Effects of Modifier Nd on Microstructure and Hardness of Mg-3Si-4Zn-xNd Alloy

作　　者：赵晨爔 童文辉 郭音 黄博男 许清绮 王杰 ZHAO Chenxi;TONG Wenhui;GUO Yin;HUANG Bonan;XU Qingqi;WANG Jie(School of Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110004,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110004

出　　处：《热加工工艺》2024年第15期100-103,共4页Hot Working Technology

基　　金：辽宁省教育厅科学研究项目(JYT2020079)。

摘　　要：通过向Mg-3Si-4Zn镁合金中添加变质剂Nd,制备了不同Nb含量的Mg-3Si-4Zn-xNd镁合金。通过观察初生及共晶Mg_(2)Si的组织变化,探究变质剂Nd对Mg_(2)Si组织的影响。通过试验探究Mg_(2)Si相的变化对合金力学性能的影响。结果表明,变质剂Nd对初生及共晶Mg_(2)Si相皆有良好的变质作用。当Nd含量为2.5%时,获得最佳的变质效果,初生Mg2Si由平均面积约600μm^(2)(40μm×15μm)的粗大的树枝状组织变为平均面积约139μm^(2)的细小且不规则的多边形块状组织,共晶Mg_(2)Si由平均面积约444μm^(2)的复杂汉字状变为平均面积约145μm^(2)的简单汉字状组织,合金硬度由58.75 HV0.1提高到73.27 HV0.1(最大值),提高24.7%。Mg-3Si-4Zn-xNd magnesium alloys with different Nb contents were prepared by adding modifier Nd to Mg-3Si-4Zn magnesium alloy.By observing the microstructure changes of primary and eutectic Mg_(2)Si,the influence of modifier Nd on the microstructure of Mg_(2)Si was explored.Through the test,the effect of the change of Mg_(2)Si phase on the hardness of the alloy was explored.The results show that the modifier Nd has a good effect on both the primary and eutectic Mg_(2)Si.When the Nd content is 2.5%,the best metamorphic effect is obtained.The primary Mg_(2)Si changes from a coarse dendritic structure with an average area of about 600μm^(2)(40μm×15μm)to a fine and irregular structure with an average area of about 139μm^(2)polygonal bulk structure,eutectic Mg_(2)Si changes from a complex Chinese character shape with an average area of about 444μm^(2)to a simple Chinese character structure with an average area of about 145μm^(2).The hardness of the alloy reaches the maximum value,increasing from 58.75 HV0.1 to 73.27 HV0.1,increasing by 24.7%.

关 键 词：Mg-Si-Zn-xNd合金 Mg_(2)Si相 Nd变质 硬度 

分 类 号：TG243[金属学及工艺—铸造]