稀土Y对TiZrNb中熵合金组织及性能的影响  

Effect of Rare Earth Y on the Structure and Properties of TiZrNb Medium Entropy Alloys

作　　者：耿甜甜 李炳[1] 范新会[1] 李想 李宗茂 谭本立 GENG Tian-tian;LI Bing;FAN Xin-hui;LI Xiang;LI Zong-mao;TAN Ben-li(School of Materials and Chemical Engineering,Xi′an Polytechnic University,Xi′an 710021,Shaanxi,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《铸造》2024年第11期1506-1511,共6页Foundry

基　　金：陕西省科技厅一般项目(2024JC-YBQN-0403);陕西省教育厅一般科研项目(22JK0418)。

摘　　要：采用真空感应熔炼铸造的方法制备出TiZrNb、TiZrNbY_(0.25)和TiZrNbY_(0.5)三种中熵合金,研究了稀土元素Y对TiZrNb合金的组织结构、力学性能以及耐蚀性能的影响。结果表明,随着Y含量的增加,合金晶粒组织得到细化,成分更加均匀,但在枝晶间形成了少量的富Y,富Zr及Ti_(4)Nb相。稀土Y的添加,提高了TiZrNb合金的压缩屈服强度,但TiZrNbY_(0.5)合金枝晶间析出较多强度较差的富Y相,其压缩屈服强度低于TiZrNbY_(0.25)合金。此外,Y元素提高了TiZrNb合金的耐蚀性能,TiZrNbY_(0.25)合金在1 mol/L HCl溶液中的腐蚀电流密度仅为4.71×10^(-7)A/cm^(2)。In this paper,three medium entropy alloys,TiZrNb,TiZrNbY_(0.25)and TiZrNbY_(0.5),were prepared by vacuum induction melting and casting,and the effects of rare earth element Y on the structure,mechanical properties and corrosion resistance of TiZrNb alloys were investigated.The results showed that with the increase of Y content,the grain structure of the alloys was refined and the composition was more homogeneous,but a small amount of Y-rich,Zr-rich and Ti4Nb phases were formed between the dendrites.The addition of rare earth Y improved the compressive yield strength of TiZrNb alloy,but the TiZrNbY_(0.5)alloy precipitated more Y-rich phases of poor strength between the dendrites,and its compressive yield strength was lower than that of TiZrNbY_(0.25)alloy.In addition,the Y element improved the corrosion resistance of TiZrNb alloy,and the corrosion current density of TiZrNbY_(0.25)alloy in 1 mol/L HCl solution was only 4.71×1^(0-)7 A/cm^(2).

关 键 词：稀土Y 中熵合金 显微组织 屈服强度 耐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG249.5[金属学及工艺—金属材料]