Microstructure and Properties of Nb-W Alloy Prepared via CVD

被引：0

作者：

Zhang, Mao ^{[1
]}

Hu, Changyi ^{[1
]}

Cai, Hongzhong ^{[1
]}

Wang, Xian ^{[1
]}

Wei, Yan ^{[1
]}

机构：

[1] State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming,650106, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2022年 / 51卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Atoms - Binary alloys - Crystal structure - Grain boundaries - Grain size and shape - Niobium alloys - Scanning electron microscopy - Solid solutions - Tungsten alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Chemical vapor deposition (CVD) method was used to prepare Nb-W binary alloy. The microstructure and mechanical properties of the Nb-W binary alloy were studied by metallographic microscopy, scanning electron microscopy, electron probe spectroscopy and microhardness tests. Results show that the resulting Nb-W binary alloy has the characteristics of a regular angle layered structure, which is mainly composed of columnar crystals with the following composition fluctuations: Nb as the matrix at the connection between the layers with Nb-W solid solution distributed around it. The Nb-W solid solution is used as the matrix in the layer around which the Nb atoms are evenly distributed. Macroscopically, the W atoms mainly form a layer along the crystal growth direction, followed by transition to Nb atoms through the NbW solid solution; microscopically, the distribution of Nb and W atoms shows the characteristics of alternating content. The layered structure of the Nb-W alloy, composition difference between the layers, and overlapping difference of the grain size between the layers were verified by finite element simulation calculations and analysis, which play a significant role in improving the mechanical properties. The CVD forming mechanism and strengthening mechanism of Nb-W alloys were also revealed. Copyright © 2022, Northwest Institute for Nonferrous Metal Research. Published by Science Press. All rights reserved.

引用

页码：2830 / 2838