Abstract
In this work, we used hydride-dehydride Ti (HDH-Ti) powders (with the oxygen levels of 0.17 and 0.51 wt pct, respectively) combined with microstructural characterization and thermodynamic analysis to reveal the evolution of surface oxide film and associated densification mechanism during sintering. The results show that the oxide film in the powder surface could start to be dissolved above 500 °C during sintering. Besides, the dissolution behavior of the oxide film was investigated via thermodynamic and kinetic analysis. The high-oxygen Ti-0.51O powders exhibited a lower onset temperature of sintering necking, a higher β phase transus temperature and a lower densification rate within the β phase zone, compared with the low-oxygen Ti-0.17O powders. Fundamentally, this is attributed to the high-concentration gradients of vacancy defect and oxygen atom within the oxide film driven by the gradual oxide-film dissolution to promote the surface diffusion, subsequently leaving the solute oxygen atoms to hinder the following α-to-β phase transition. Due to the grain boundary pinning and diffusional activation energy increase, the higher oxygen atoms dissolved in the Ti matrix delay the bulk and grain boundary diffusion rates, and thus disfavors the final densification at the high-temperature sintering stage. This work affords opportunities to understand the densification mechanism of Ti powder sintering involved with the oxide film in the powder surface, and thus help to benefit the final properties of sintered parts.
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Acknowledgments
This work was funded by the National Key Research and Development Program of China (No.: 2021YFB3701900), National Natural Science Foundation of China (No.: 51971036), and Shandong Provincial Key Research and Development Program (No.: 2019JZZY010327). The authors are grateful for the technical assistance of Dr. Cong Zhang at University of Science and Technology Beijing, P.R. China. We also appreciate the support of Shanghai Synchrotron Radiation Facility for providing the beam time for the synchrotron X-ray CT work conducted on the BL13W1 beamline.
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Xin, F., Ding, W., Tao, Q. et al. Effect and Evolution of Oxide Film in the HDH-Ti Powder Surface on Densification Behavior During Sintering. Metall Mater Trans A 53, 1164–1175 (2022). https://doi.org/10.1007/s11661-022-06598-1
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DOI: https://doi.org/10.1007/s11661-022-06598-1