Plastic deformation mechanism of high pure tungsten prepared by CVD method at high strain rate

Chengwen Tan*, Hongchan Sun, Xiaodong Yu, Shukui Li, Fuchi Wang, Hongnian Cai

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

3 引用 (Scopus)

摘要

High pure tungsten (W, 99.99%) were prepared by chemical vapor deposition (CVD), then high pure tungsten and polycrystalline tungsten prepared by powder metallurgy (PM) process were impacted using Split Hopkinson Bar (SHB) over a narrow range of strain rates, 1000 s-1-2000 s-1. The deformation mechanisms were analyzed by optical microscope (OM). The results show that the main deformation mechanisms of the polycrystalline tungsten prepared by Powder Metallurgy Process are slip and grain-boundary slide, while those of high pure tungsten are slip, twinning deformation and grain-boundary slide. The interaction between the neighbouring twinnings may induce two kinds of intergranular cracks, which is the key reason of the high pure tungsten em-brittleness. The adiabatic shear band (ASB) is not found for the high pure tungsten under the strain rate in this paper e. g. lower than 103 s-1, so the plastic deformation ability of the high pure tungsten can not be improved as that of tungsten heavy alloy (WHA).

源语言英语
页(从-至)100-103
页数4
期刊Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
36
1
出版状态已出版 - 1月 2007

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