Finite element simulation of the SPTAs bulks preparation process by SPS and its microstructure analysis
In this paper,the effects of temperature and current fields on the homogeneity of self-passivation tungsten alloys(SPTAs)prepared by spark plasma sintering(SPS)were systematically investigated by combining experiments and simulations,and the relationships between sintering temperature,sintering time,current density,and the microstructure of SPTAs were established.The results show that the temperature of the SPTAs bulks with different sizes during SPS consolidation is unevenly distributed along the radial direction,resulting in the measured temperature being much lower than the actual temperature of the samples.Combined with the microstructure characterization,it is found that increasing the current density during sample sintering can shorten the sintering time,and has a positive effect on obtaining fine-grained and homogeneous microstructure,but it is necessary to consider the difference of grain size caused by radial temperature gradient.This study can provide a reference for the SPS preparation process design of large-sized SPTAs bulks.
self-passivation tungsten alloysspark plasma sinteringnuclear fusionfinite elementelectro-thermal coupling model
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