Effect of Milling Time on Preparation of NbMoTaW High Entropy Alloy Powder by Mechanical Alloying

被引：0

作者：

Qi, Peibu ^{[1
]}

Liang, Xiubing ^{[2
]}

Tong, Yonggang ^{[3
]}

Chen, Yongxiong ^{[2
]}

Zhang, Zhibin ^{[2
]}

机构：

[1] Army Academy of Armored Forces, Beijing,100072, China

[2] National Institute of Defense Technology Innovation, Academy of Military Sciences China, Beijing,100010, China

[3] Changsha University of Science & Technology, Changsha,410000, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2019年 / 48卷 / 08期

关键词：

Ball milling time - BCC solid solution - Element distribution - Impurity content - Laser particle size distribution - Milling time - Particle size change - Powder morphology;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

NbMoTaW high entropy alloy powders were prepared by mechanical alloying. The effects of milling time on the powder phase structure, microstructure, impurity content and particle size were studied. The phase and morphology of the high-entropy alloy powder were analyzed by X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The element distribution and impurity content in the powder were quantitatively analyzed by the energy spectrum analyzer. The particle size distribution of the powder was measured by the laser particle size distribution tester. The results show that the mixed powder undergoes three stages with milling time increasing: flattening, cold welding breakage, and sphericity. After 45 h ball milling, the powder forms a single bcc solid solution. The powder morphology changes from an initial irregular shape to a sheet shape, and then it changes into an ellipsoidal shape. Meanwhile, the sphericity is gradually optimized. The impurities mainly originate from the agate jar and the grinding ball. The powders after different ball milling time show different impurity content growth rates. The particle size changes with milling time, showing a trend of increasing first and then decreasing, and the particle size distribution is more uniform. © 2019, Science Press. All right reserved.

引用

页码：2623 / 2629