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

稀土学报(英文版), 2009, 27(6): 961-966. doi: 10.1016/S1002-0721(08)60370-1

^1, , ^2, , ^3, , ^4,

1.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

2.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

3.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

4.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

基金项目: the Doctorate Foundation of Chinese Ministry of Education(20070005010) the Program for New Century Excellent Talents in University(NCET 2006-06-0182) 国家自然科学基金(50871001)

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

LU Nianduan ^1, , SONG Xiaoyan ^2, , LIU Xuemei ^3, , ZHANG Jiuxing ^4,

1.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

2.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

3.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

4.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China

Keywords： spark plasma sintering

A series of rare earth bulks with the ultrafine nanocrystalline structure were prepared by applying an "oxygen-free" (an environ-mental 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 micro-hardness, and the elastic modulus of the ultrafine nanocrystalline rare earth bulks were significantly increased from the conventional poly-crystalline bulks.

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

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