Keynote Speakers

Abstract: With the problems in the current powder metallurgy (PM) production of high-performance pure tungsten (W) metal and its alloy like tungsten-copper (W-Cu), comprehensive multi-scale dynamic simulations on the whole PM process (including die filling, compacting and sintering) of elemental W and composite W/Cu powders were performed by using the coupled discrete element method (DEM) and finite element method (FEM). The effects of operating conditions, processing parameters, powder properties as well as their initial packing structures on the powder densification behaviour in each PM stage were systematically investigated. And the macroscopic and microscopic properties of the W and W-Cu compacts/sintered parts obtained from different PM stages were quantitatively characterized and compared. Meanwhile, corresponding densification dynamics and mechanisms in each PM stage were discussed and analysed based on the force/stress evolution. Numerical simulation results indicate that by properly controlling the operating conditions and processing parameters, high-performance pure W metal and W-Cu alloy can be numerically reproduced by PM technique. Different processing methods can lead to the difference of powder densification dynamics and mechanisms in each PM stage. Compared with the traditional simulation method, the coupled DEM and FEM approach can realize the multi-scale simulation of the whole PM production process of pure W and W-Cu alloy. It can not only solve the deficiency in current physical experiments and numerical simulations, but also make the simulation results more accurate and much closer to the real process.

Keywords: Powder metallurgy, multi-scale simulation, pure W metal and W-Cu alloy, structure characterization, densification behaviour and mechanism

Acknowledgements: The authors are grateful for the financial support from National Key Development Program of the Ministry of Science and Technology of China (2017YFB0305603), Liaoning Revitalization Talents Program (XLYC1805007), and Shenyang Young and Middle-aged Science and Technology Innovation Talent Support Program (RC170512).

Biography: Dr. Xizhong An got his Ph.D degree from University of Science and Technology Beijing (USTB) in 2002, and currently he is working as a full professor and director of Institute of Particle Technology in School of Metallurgy, Northeastern University (NEU). Prof. An’s research interests include numerical and physical studies on particle packing, powder processing, granular matter, powder metallurgy, additive manufacturing, material design and optimization, etc. In recent years, he has undertaken more than 30 projects from overseas, Chinese government, local government, and enterprises. More than 120 papers were published, including one book chapter and >90 SCI journal papers in Physical Review Letters, Soft Matter, Powder Technology, Journal of Alloys and Compounds, Europhysics Letters, Computer Physics Communications, Chemical Engineering Science, Nanotechnology, European Physical Journal E, Applied Physics A, AIP Advances, RSC Advances, Sensors & Actuators: B. Chemical, Metals, Applied Surface Science, Advanced Powder Technology, Metallurgical and Materials Transactions A, Metallurgical and Materials Transactions B, Granular Matter, Particuology, Engineering Applications of Computational Fluid Mechanics, Particulate Science and Technology, Engineering Analysis with Boundary Elements, Journal of Mining and Metallurgy Section B: Metallurgy, Nanoscale Research Letters, Journal of Nanoscience and Nanotechnology, Materials Chemistry and Physics, Computer & Fluids, Catalysts, Diamond and Related Materials, Materials Science and Technology, Polish Journal of Environmental Studies, Chinese Physics Letters, International Journal of Minerals, Metallurgy, and Materials, Mathematical Problems in Engineering, et al. More than 30 Chinese patents were applied, where 13 of them were authorized. His honors and awards include: Candidate for “Liaoning Hundred, Thousand, and Ten Thousand Talents Engineering”, Hundred Level (2009); Candidate for “New Century Outstanding Talents” of Ministry of Education of China (2010); “Outstanding Scientific and Technological Worker” of Liaoning province (2014); “Longchuan Talent” of Yangzhou City, China (2015); “Shuangchuang Doctor” of Jiangsu Province (2016); “Science and Technology Progress Award (second prize)” of Chinese Society of Particuology (2016); “Leading Talent” of Shenyang (2017); “Natural Science Award (second prize)” of Chinese Society of Particuology (2018); “Liaoning Revitalization Talents Program -Leading Talent of Hundred, Thousand, and Ten Thousand project” of Liaoning Province (2018). He is the executive director of National Materials New Technology Development Research Institute; Director of Chinese Society of Micro-Nano Technology; Youth Director of Chinese Society of Particuology; Director of Liaoning Society of Particuology. Member of editorial board for many domestic and international journals.