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

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

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In this work,accelerated sintering of Y2O3 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 Y2O3 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-Y2O3 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 Y2O3,respectively.

Plasma synthesisComposite nanopowdersW-Y2O3 alloyDissolution-precipitationAccelerated densification

Peng Hu、Xinyu Gong、Hexiong Liu、Wenyuan Zhou、Jinshu Wang

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Key Laboratory of Advanced Functional Materials,Education Ministry of China,Faculty of Materials and Manufacture,Beijing University of Technology,Beijing 100124,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBeijing Natural Science Foundation

52130407521743422232044

2024

10.1016/j.jmst.2023.11.004

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.184(17)
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