Morphology and particle analysis of the Ni3Al-based spherical powders manufactured by supreme-speed plasma rotating electrode process

• Main Authors: Zhi-Yu Han, Ping-Xiang Zhang, Li-Ming Lei, Shu-Jin Liang, Qing-Xiang Wang, Yun-Jin Lai, Jin-Shan Li
• Format: Article
• Language: English
• Published: Elsevier 2020-11-01
• Series: Journal of Materials Research and Technology
• Subjects: Single crystal; PREP; Superalloy; Rapid solidification; Atomization
• Online Access: http://www.sciencedirect.com/science/article/pii/S2238785420318275

The Ni-11Mo-8Al-3Ta-2Cr-1Re spherical powders of <150 μm were successfully prepared by the novel technique called supreme-speed plasma rotating electrode process (SS-PREP). The morphology of the atomized powders was observed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). A formation mechanism of some irregular particles appeared in the powders was described and the differences of their microstructures were analyzed by the image-replicating method. The composition differences of the irregular particles were multi-confirmed by EDS. The particle size distribution (PSD) data of the SS-PREP Ni-11Mo-8Al-3Ta-2Cr-1Re powders were well simulated with the newly reported double peak atomization assumption. The relationship between the particle size of the atomized Ni-based powders and the rotating speed of SS-PREP was also discussed and recorded.