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Microstructural characterization of boron-rich boron carbide
Xie, Kelvin Y.1,3; Domnich, Vladislav2; Farbaniec, Lukasz3; Chen, Bin4; Kuwelkar, Kanak2; Ma, Luoning1,3; McCauley, James W.3; Haber, Richard A.2; Ramesh, K.T.1,3; Chen, Mingwei4,5; Hemker, Kevin J.1,3
2017
发表期刊Acta Materialia
ISSN13596454
卷号136页码:202-214
摘要Boron carbide has a wide range of solubility, but the effects of stoichiometry on its microstructure and mechanical response are not well understood. In this study, detailed microstructural characterization was carried out on three hot-pressed B-rich boron carbide samples. Lattice parameter measurements from XRD identified the compositions to be B4.2C, B5.6C and B7.6C. Local substitutional disorder was observed by Raman spectroscopy, particularly for more B-rich samples. Electron energy loss spectroscopy observations suggest that excess boron preferentially substitutes for carbon atoms in the B11C icosahedra; after which additional boron modifies the CBC chains. Moreover, the boron content has salient effects on boron carbide densification and microstructure. Improved densification was observed in the more B-rich samples (B5.6C and B7.6C), and there is a transition from few or no intragranular planar defects (B4.2C), to numerous stacking faults (B5.6C), to copious twins (B7.6C). Nanoindentation experiments revealed that the highest value for B4.2C is statistically larger than that for B5.6C or B7.6C, suggesting that the hardness of boron carbide is reduced by boron substitution. © 2017 Acta Materialia Inc.
DOI10.1016/j.actamat.2017.06.063
EI入藏号20172803927044
EI主题词Boron carbide
EI分类号525.4 Energy Losses (industrial and residential) - 801.4 Physical Chemistry - 804.2 Inorganic Compounds - 933.1.1 Crystal Lattice - 951 Materials Science
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文献类型期刊论文
条目标识符http://ir.sic.ac.cn/handle/331005/25598
专题中国科学院上海硅酸盐研究所
作者单位1.Department of Mechanical Engineering, Johns Hopkins University, Baltimore; MD; 21218, United States;
2.Ceramic and Composite Materials Center, Rutgers University, New Brunswick; NJ; 08854, United States;
3.Hopkins Extreme Materials Institute, Johns Hopkins University, Baltimore; MD; 21218, United States;
4.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai; 200240, China;
5.Department of Materials Science and Engineering, Johns Hopkins University, Baltimore; MD; 21218, United States
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Xie, Kelvin Y.,Domnich, Vladislav,Farbaniec, Lukasz,et al. Microstructural characterization of boron-rich boron carbide[J]. Acta Materialia,2017,136:202-214.
APA Xie, Kelvin Y..,Domnich, Vladislav.,Farbaniec, Lukasz.,Chen, Bin.,Kuwelkar, Kanak.,...&Hemker, Kevin J..(2017).Microstructural characterization of boron-rich boron carbide.Acta Materialia,136,202-214.
MLA Xie, Kelvin Y.,et al."Microstructural characterization of boron-rich boron carbide".Acta Materialia 136(2017):202-214.
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