Finite element simulation of the SPTAs bulks preparation process by SPS and its microstructure analysis
LÜ Kuang1, TAN Xiaoyue1,2,3, TU Qingbo2, DING Jie1, MA Yingqun1, LUO Laima2,3, WU Yucheng2,3
1. China Academy of Science and Technology Development Guangxi Branch, Nanning 530022, China; 2. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; 3. National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China
Abstract：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.
吕旷, 谭晓月, 涂清波, 丁杰, 马英群, 罗来马, 吴玉程. SPS制备SPTAs块体过程的有限元模拟及其微观组织分析[J]. 粉末冶金材料科学与工程, 2024, 29(2): 83-92.
LÜ Kuang, TAN Xiaoyue, TU Qingbo, DING Jie, MA Yingqun, LUO Laima, WU Yucheng. Finite element simulation of the SPTAs bulks preparation process by SPS and its microstructure analysis. Materials Science and Engineering of Powder Metallurgy, 2024, 29(2): 83-92.
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2024, Vol. 29 
