Diffusion behavior of FCC Ni-Al system in spark plasma sintering electric field
WANG Fei1, LIU Yuling1, DU Changfa2, MIN Qianhui1, LIU Huixin1, WEN Shiyi1, DU Yong1
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. School of Mathematics and Statistics, Central South University, Changsha 410083, China
Abstract The smelting method was employed to prepare the Ni-9Al (mole fraction, %) alloys and pure Ni, and then the Ni/Ni-Al/Ni diffusion couples were annealed for diffusion in spark plasma sintering (SPS). The concentration profiles of FCC Ni-Al system at 1 173-1 373 K under the effect of SPS current were obtained combining with electronic probe microanalysis (EPMA). The Sauer-Freise method and empirical formula were employed to calculated diffusion coefficients respectively. The concentration profiles without current were simulated based on the atomic mobilitiy parameters without the influence of applied field and then the diffusion coefficients were calculated meanwhile. Comparing the simulated concentration profiles with the experimental ones. The results show that the current promotes the diffusion of Ni-Al alloys. The direction of the current has negligible effect on the diffusion of Ni-Al alloys. The concentration profiles and diffusion coefficients under different current directions have a high degree of overlap, indicating that the influence of electromigration on the diffusion of Ni-Al alloy is negligible. The applied current has little effect on the diffusion frequency factor, while the applied current significantly reduces the diffusion activation energy.
WANG Fei,LIU Yuling,DU Changfa, et al. Diffusion behavior of FCC Ni-Al system in spark plasma sintering electric field[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(5): 412-418.
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2021, Vol. 26 
