YH_(2)掺杂对黏结剂喷射成形钨合金微观结构及力学性能的影响  

Effect of YH_(2)Doping on the Microstructure and Mechanical Properties of Tungsten Alloys Prepared by Binder Jetting 3D Printing

作　　者：刘凯源 张利 曹利 付建平[3] 张锦芳 李晓峰[1] 王铁军[4] 干勇 LIU Kaiyuan;ZHANG Li;CAO Li;FU Jianping;ZHANG Jinfang;LI Xiaofeng;WANG Tiejun;GAN Yong(School of Materials Science and Engineering,North University of China,Taiyuan 030051,Shanxi,China;Institute of Special Metal Materials and Equipment,North University of China,Taiyuan 030051,Shanxi,China;Institute of Intelligent Weaponry,North University of China,Taiyuan 030051,Shanxi,China;Advanced Technology and Materials Co.,Ltd.,Beijing 100081,China;Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]中北大学特种金属材料与装备研究院,山西太原030051 [3]中北大学智能武器研究院,山西太原030051 [4]安泰科技股份有限公司,北京100081 [5]钢铁研究总院有限公司,北京100081

出　　处：《中国钨业》2024年第6期50-57,共8页China Tungsten Industry

基　　金：国家自然科学基金(51804280);山西省科技创新人才团队(202304051001029);山西省科技成果转化引导专项(202204021301048);中国科协青年人才托举工程(2023QNRC001)。

摘　　要：本研究采用黏结剂喷射3D打印(BJ3DP)技术制备了掺杂1%(质量分数,下同)稀土氢化物(YH_(2))的95W-3.5Ni-1.5Fe合金,系统探究了YH_(2)对合金显微组织、力学性能及摩擦磨损行为的影响。结果表明,YH_(2)能够通过晶界钉扎作用显著控制钨晶粒(10~15μm)尺寸,但YH_(2)在合金粉体中的不均匀分布导致成形后组织中存在Y的富集区与贫化区;添加1%YH_(2)后,合金抗拉强度为510 MPa,但伸长率仅0.4%,表现为典型脆性断裂,这主要是因为Y原子在晶界处发生过度偏聚(局部浓度7.5%),导致界面结合强度显著下降。此外,YH_(2)掺杂显著改善合金的耐磨性,磨痕深度由8μm降至更低水平,这主要是因为沿晶弥散分布的Y有抑制裂纹扩展的作用以及YH_(2)的硬质特性能够增强合金抗塑性变形的能力。研究提出优化YH_(2)添加量以实现晶粒尺寸控制与界面强化的平衡,为BJ3DP结合稀土掺杂制备高性能复杂结构钨合金提供了理论依据与工艺参考。A 95W-3.5Ni-1.5Fe alloy doped with 1%rare earth hydride(YH_(2))was prepared using binder jetting 3D printing(BJ3DP)technology.It then systematically investigatied the effects of YH_(2)on microstructure,mechanical properties,and tribological behavior.Results demonstrate that YH_(2)effectively controls tungsten grain size(10-15μm)through grain boundary pinning.However,inhomogeneous YH_(2)distribution in powder materials leads to localized Y-enriched and Y-depleted regions in the as-printed alloy.The YH_(2)-doped alloy exhibits a tensile strength of 510 MPa but limited ductility(0.4%elongation),showing typical brittle fracture characteristics.This embrittlement primarily originates from excessive Y segregation at grain boundaries(local concentration reaching 7.5%),which significantly weakens interfacial bonding strength.Notably,YH_(2)doping remarkably enhances wear resistance,reducing wear scar depth from 8μm to substantially lower values.This improvement is attributed to two mechanisms:1)intergranularly dispersed Y particles effectively inhibit crack propagation,and 2)the intrinsic hard nature of YH_(2)reinforces the alloy's resistance to plastic deformation.The study proposes optimizing YH_(2)content to achieve a balance between grain size control and interfacial strengthening,providing both theoretical guidance and technical references for manufacturing high-performance complex-structured tungsten alloys through BJ3DP combined with rare earth doping..

关 键 词：稀土氢化物 高比重钨合金 黏结剂喷射3D打印 力学性能 

分 类 号：TG146.411[一般工业技术—材料科学与工程] TG135.5[金属学及工艺—金属材料]