Characterization of High-Energy Ball-Milled and Hot-Pressed Nanocrystalline Tantalum

2nd International Conference on Civil Engineering and Materials Science

Jakubowicz, J.^1 ; Adamek, G.^1 ; Sopata, M.^1

Poznan University of Technology, Institute of Material Science and Engineering, Jana Pawla II, 24, Poznan

61-138, Poland^1

关键词: Densification process;    High frequency induction heating;    High-energy ball milling;    Lower sintering temperatures;    Nanocrystalline bulk;    Nanocrystallines;    Structure and microstructures;    Ultra fine grain;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/216/1/012006/pdf
DOI  :  10.1088/1757-899X/216/1/012006

来源: IOP

【 摘 要 】

The paper shows a comparison of nanocrystalline and microcrystalline tantalum sinters. The nanocrystalline tantalum was made using high-energy ball milling. The sinters were made using hot pressing with high frequency induction heating. The structure and microstructure of the powders and sinters were investigated. After 48 hour milling, the microcrystalline tantalum transformed into nanocrystalline powder. The hot pressing resulted in a formation of bulk tantalum with ultrafine grains and hardness as high as 1067 HV. The nanostructure supports the densification process at lower sintering temperature in comparison to microcrystalline tantalum. The average crystallite size in nanocrystalline bulk materials reached 170 nm.