Structure and properties of nanocrystalline rare earth bulks prepared by spark plasma sintering

A series of rare earth bulks with the ultrafine nanocrystalline structure were prepared by applying an “oxygen-free” (an environmental oxygen concentration less than 0.5 ppm) in-situ synthesis system, where the inert-gas condensation was combined with the spark plasma sintering technology into an en...

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Bibliographic Details
Published in:Journal of rare earths 2009-12, Vol.27 (6), p.961-966
Main Authors: LU, Nianduan, SONG, Xiaoyan, LIU, Xuemei, ZHANG, Jiuxing
Format: Article
Language:English
Subjects:
physical property
rare earths
spark plasma sintering
ultrafine nanocrystalline bulk
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Summary:A series of rare earth bulks with the ultrafine nanocrystalline structure were prepared by applying an “oxygen-free” (an environmental oxygen concentration less than 0.5 ppm) in-situ synthesis system, where the inert-gas condensation was combined with the spark plasma sintering technology into an entirely closed system. The thermal and mechanical properties of the prepared ultrafine nanocrystalline bulks were characterized and compared with those of the raw polycrystalline bulks. It was found that the specific heat capacity, the microhardness, and the elastic modulus of the ultrafine nanocrystalline rare earth bulks were significantly increased from the conventional polycrystalline bulks.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(08)60370-1