Initial-stage Sintering Kinetics of Nanocrystalline Tungsten |
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Authors: | Ajeet K. Srivastav M. Sankaranarayana B. S. Murty |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India;(2) Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500 058, India |
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Abstract: | Initial-stage sintering kinetics of nanocrystalline tungsten has been studied in the temperature range of 1273–1473 K (1000–1200 °C). Nanocrystalline tungsten sinters initially through a grain boundary diffusion mechanism. The calculated activation energy was 388 ± 11 kJ/mol at low temperatures (1273–1373 K (1000–1100 °C)) and 409 ± 7 kJ/mol at high temperatures (1373–1473 K (1100–1200 °C)), which are close to the experimentally measured activation energy for grain boundary diffusion (385 kJ/mol). |
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