Al对Al_(x)Mo_(0.5)NbTiVSi_(0.2)高熵合金组织和性能影响  

Effects of Al on Microstructure and Properties of Al_(x)Mo_(0.5)NbTiVSi_(0.2)High Entropy Alloys

作　　者：王晔[1] 汪天天 蒋文韬 姜博[1] 朱冬冬[2] 胡茂良[1] Wang Ye;Wang Tiantian;Jiang Wentao;Jiang Bo;Zhu Dongdong;Hu Maoliang(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology;Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province,Quzhou University)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院 [2]衢州学院浙江省空气动力装备技术重点实验室

出　　处：《特种铸造及有色合金》2023年第7期871-875,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52071188)。

摘　　要：采用真空电弧熔炼工艺制备了不同Al含量的Al_(x)Mo_(0.5)NbTiVSi_(0.2)(x=0.5,0.8,1.0,摩尔比)难熔高熵合金。研究了合金的相组成、微观组织、密度和力学性能。结果表明,Al_(x)Mo_(0.5)NbTiVSi_(0.2)高熵合金的微观组织为典型的树枝晶结构,均由BCC固溶体相和M_(5)Si_(3)金属间化合物相组成。Al含量的增加并未使得合金的相组成发生改变。合金BCC基体相富集Al、Mo和V元素,M_(5)Si_(3)相富集Ti和Si元素,Nb元素在两相中分布较为均匀。随Al含量增加,合金的密度从6.18g/cm^(3)降至5.86g/cm^(3),硬度提升了13.7%,压缩屈服强度增加约332MPa,增幅达到37%,抗压强度从1073MPa提高到1457 MPa,断裂应变从13.6%增加到14.4%。合金力学性能的提升主要是通过固溶强化、细晶强化和第二相强化机制实现的。Al_(x)Mo_(0.5)NbTiVSi_(0.2)(x=0.5,0.8,1.0,molar ratio)refractory high entropy alloys with different Al contents were fabricated by vacuum arc melting.The phase composition,microstructure,density and mechanical properties of the alloy were investigated.The results indicate that the Al_(x)Mo_(0.5)NbTiVSi_(0.2)high entropy alloys are characterized by dendritic structure,which are composed of BCC solid solution matrix phase and M_(5)Si_(3)intermetallic phase.The phase composition of the alloy has little change with the increase of Al content.Al,Mo and V elements are enriched in BCC matrix phase,while Ti and Si elements are enriched in M_(5)Si_(3)phase,and Nb elements are evenly distributed in both phases.With the increase of Al content,the density of the alloy is decreased from 6.18 g/cm^(3)to 5.86 g/cm^(3),and the hardness is increased by 13.7%.The compressive yield strength is increased by nearly 332 MPa(37%),and the compressive strength is increased from 1073 MPa to 1457 MPa,while the fracture strain is increased from 13.6%to 14.4%.The enhancement of mechanical properties are mainly attributed to solid solution strengthening,fine grain strengthening and second phase strengthening mechanisms.

关 键 词：难熔高熵合金 Alx Mo0.5NbTiVSi0.2 微观组织 硬度 压缩性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG139[金属学及工艺—金属材料]