A novel dissolution-precipitation strategy to accelerate the sintering of yttrium oxide dispersion strengthened tungsten alloy with well-regulated structure  

作　　者：Peng Hu Xinyu Gong Hexiong Liu Wenyuan Zhou Jinshu Wang 

机构地区：[1]Key Laboratory of Advanced Functional Materials,Education Ministry of China,Faculty of Materials and Manufacture,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Materials Science & Technology》2024年第17期43-53,共11页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52130407,52174342);Beijing Natural Science Foundation(No.2232044).

摘　　要：In this work,accelerated sintering of Y_(2)O_(3)dispersion strengthened tungsten alloy with a well-regulated structure was achieved by a novel dissolution-precipitation strategy.As indicated,yttrium oxide was firstly dissolved into the lattices of W powder precursor during the thermal plasma synthesis process in a one-step and ultra-fast way,and then homogeneously precipitated out within W grains during sintering.The theoretical calculation reveals that the formation process of Y_(2)O_(3)dispersoids enhanced the driving force of densification by increasing the sintering stress and declining the macroscopic viscosity,resulting in improved diffusion ability for the W skeleton.The microstructural investigation further confirmed the occurrence of mass inter-diffusion at the W-Y_(2)O_(3)interface,which provides a fast diffusion pathway for W atoms,and is responsible for the accelerated densification kinetics.Being sintered at 1600℃ for 1 h,the as-obtained alloy possesses a high relative density of 98.26%,together with a refined grain size of 970 nm for W and 50 nm for intragranular Y_(2)O_(3),respectively.

关 键 词：Plasma synthesis Composite nanopowders W-Y_(2)O_(3)alloy Dissolution-precipitation Accelerated densification 

分 类 号：TG146.411[一般工业技术—材料科学与工程] TG146.11[金属学及工艺—金属材料]